293463aaac
Add complete test coverage for MockUpstream server scenarios and methods: - Verify all 11 documented scenarios (429, empty body, errors, etc.) - Test all 6 MockUpstream methods (GetRequestCount, SetFailUntilCount, etc.) - Add 8 proxy integration tests verifying end-to-end behavior All tests pass, confirming MockUpstream correctly simulates: * Rate limiting with Retry-After headers * Malformed responses (empty/invalid JSON, empty streaming) * Non-retryable errors (422, 500, 404) * Retry behavior through the proxy handler * Delay simulation and custom handler overrides Co-Authored-By: Claude <noreply@anthropic.com>
691 lines
19 KiB
Go
691 lines
19 KiB
Go
package main
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import (
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"encoding/json"
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"io"
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"net/http"
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"testing"
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"time"
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"github.com/prometheus/client_golang/prometheus/testutil"
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)
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// TestMockUpstream_AllScenarios verifies that all MockUpstream scenarios work correctly.
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func TestMockUpstream_AllScenarios(t *testing.T) {
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t.Run("429-with-retry-after-then-success", func(t *testing.T) {
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mock := NewMockUpstream("429-with-retry-after-then-success")
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defer mock.Close()
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// Configure to fail for first 2 requests, then succeed
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mock.SetFailUntilCount(2)
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mock.SetRetryAfter("5")
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// Make 3 requests - first 2 should return 429, third should succeed
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for i := 0; i < 3; i++ {
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req, _ := http.NewRequest("GET", mock.URL()+"/test", nil)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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t.Fatalf("Request %d failed: %v", i, err)
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}
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if i < 2 {
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// First 2 requests should return 429 with Retry-After
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if resp.StatusCode != http.StatusTooManyRequests {
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t.Errorf("Request %d: expected status 429, got %d", i, resp.StatusCode)
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}
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if retryAfter := resp.Header.Get("Retry-After"); retryAfter != "5" {
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t.Errorf("Request %d: expected Retry-After=5, got %s", i, retryAfter)
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}
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} else {
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// Third request should succeed
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Request 2: expected status 200, got %d", resp.StatusCode)
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}
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// Verify response body is valid JSON
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if !jsonValid(t, resp) {
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t.Error("Request 2: response body should be valid JSON")
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}
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}
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resp.Body.Close()
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}
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// Verify request count is 3
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if count := mock.GetRequestCount(); count != 3 {
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t.Errorf("Expected 3 requests, got %d", count)
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}
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})
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t.Run("429-no-header-then-429", func(t *testing.T) {
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mock := NewMockUpstream("429-no-header-then-429")
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defer mock.Close()
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// All requests should return 429 without Retry-After header
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for i := 0; i < 3; i++ {
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request %d failed: %v", i, err)
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}
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if resp.StatusCode != http.StatusTooManyRequests {
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t.Errorf("Request %d: expected status 429, got %d", i, resp.StatusCode)
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}
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if retryAfter := resp.Header.Get("Retry-After"); retryAfter != "" {
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t.Errorf("Request %d: expected no Retry-After header, got %s", i, retryAfter)
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}
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resp.Body.Close()
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}
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if count := mock.GetRequestCount(); count != 3 {
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t.Errorf("Expected 3 requests, got %d", count)
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}
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})
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t.Run("empty-json-body", func(t *testing.T) {
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mock := NewMockUpstream("empty-json-body")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Expected status 200, got %d", resp.StatusCode)
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}
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body, _ := io.ReadAll(resp.Body)
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if len(body) != 0 {
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t.Errorf("Expected empty body, got %d bytes: %s", len(body), string(body))
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}
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})
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t.Run("invalid-json-body", func(t *testing.T) {
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mock := NewMockUpstream("invalid-json-body")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Expected status 200, got %d", resp.StatusCode)
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}
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body, _ := io.ReadAll(resp.Body)
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if string(body) != "{invalid json" {
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t.Errorf("Expected invalid JSON body, got %s", string(body))
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}
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})
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t.Run("empty-streaming", func(t *testing.T) {
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mock := NewMockUpstream("empty-streaming")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Expected status 200, got %d", resp.StatusCode)
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}
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if ct := resp.Header.Get("Content-Type"); ct != "text/event-stream" {
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t.Errorf("Expected Content-Type text/event-stream, got %s", ct)
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}
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body, _ := io.ReadAll(resp.Body)
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if len(body) != 0 {
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t.Errorf("Expected empty streaming body, got %d bytes", len(body))
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}
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})
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t.Run("422-no-retry", func(t *testing.T) {
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mock := NewMockUpstream("422-no-retry")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusUnprocessableEntity {
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t.Errorf("Expected status 422, got %d", resp.StatusCode)
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}
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// Should have JSON body with error message
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var result map[string]string
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body, _ := io.ReadAll(resp.Body)
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if err := json.Unmarshal(body, &result); err != nil {
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t.Fatalf("Failed to parse JSON: %v", err)
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}
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if result["error"] != "unprocessable entity" {
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t.Errorf("Expected error='unprocessable entity', got %s", result["error"])
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}
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})
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t.Run("500-no-retry", func(t *testing.T) {
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mock := NewMockUpstream("500-no-retry")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusInternalServerError {
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t.Errorf("Expected status 500, got %d", resp.StatusCode)
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}
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})
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t.Run("404-no-retry", func(t *testing.T) {
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mock := NewMockUpstream("404-no-retry")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusNotFound {
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t.Errorf("Expected status 404, got %d", resp.StatusCode)
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}
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})
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t.Run("network-error-then-success", func(t *testing.T) {
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mock := NewMockUpstream("network-error-then-success")
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defer mock.Close()
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// Configure to fail for first request, then succeed
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mock.SetFailUntilCount(1)
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// First request will succeed but with empty body (httptest.Server limitation)
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// The real network simulation would fail, but in httptest the handler just returns
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resp1, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Logf("First request failed (acceptable): %v", err)
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} else {
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// In httptest, the request succeeds but body is empty
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resp1.Body.Close()
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if resp1.StatusCode != http.StatusOK {
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t.Logf("First request status: %d (may not be 200 due to early return)", resp1.StatusCode)
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}
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}
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// Second request should succeed with full response
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resp2, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Second request failed: %v", err)
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}
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defer resp2.Body.Close()
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if resp2.StatusCode != http.StatusOK {
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t.Errorf("Second request: expected status 200, got %d", resp2.StatusCode)
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}
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if !jsonValid(t, resp2) {
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t.Error("Second request: response should be valid JSON")
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}
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// Request count should be 2
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if count := mock.GetRequestCount(); count != 2 {
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t.Errorf("Expected 2 requests, got %d", count)
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}
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})
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t.Run("success", func(t *testing.T) {
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mock := NewMockUpstream("success")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Expected status 200, got %d", resp.StatusCode)
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}
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// Read and verify response structure
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var result map[string]interface{}
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body, _ := io.ReadAll(resp.Body)
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resp.Body.Close()
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if !json.Valid(body) {
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t.Error("Response should be valid JSON")
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}
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if err := json.Unmarshal(body, &result); err != nil {
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t.Fatalf("Failed to parse JSON: %v", err)
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}
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if result["id"] != "msg_test123" {
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t.Errorf("Expected id=msg_test123, got %s", result["id"])
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}
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if result["type"] != "message" {
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t.Errorf("Expected type=message, got %s", result["type"])
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}
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})
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t.Run("malformed-streaming", func(t *testing.T) {
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mock := NewMockUpstream("malformed-streaming")
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defer mock.Close()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Expected status 200, got %d", resp.StatusCode)
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}
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if ct := resp.Header.Get("Content-Type"); ct != "text/event-stream" {
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t.Errorf("Expected Content-Type text/event-stream, got %s", ct)
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}
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body, _ := io.ReadAll(resp.Body)
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if string(body) != "not valid sse format\n" {
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t.Errorf("Expected malformed SSE data, got %s", string(body))
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}
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})
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}
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// TestMockUpstream_Methods verifies all MockUpstream methods work correctly.
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func TestMockUpstream_Methods(t *testing.T) {
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t.Run("GetRequestCount", func(t *testing.T) {
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mock := NewMockUpstream("success")
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defer mock.Close()
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// Initially 0
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if count := mock.GetRequestCount(); count != 0 {
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t.Errorf("Initial count should be 0, got %d", count)
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}
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// Make 3 requests
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for i := 0; i < 3; i++ {
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http.Get(mock.URL() + "/test")
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}
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// Should be 3
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if count := mock.GetRequestCount(); count != 3 {
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t.Errorf("Expected 3 requests, got %d", count)
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}
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})
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t.Run("SetFailUntilCount", func(t *testing.T) {
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mock := NewMockUpstream("429-with-retry-after-then-success")
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defer mock.Close()
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mock.SetRetryAfter("1")
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// Test with fail count of 2
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mock.SetFailUntilCount(2)
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// First request should fail
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resp1, _ := http.Get(mock.URL() + "/test")
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if resp1.StatusCode != http.StatusTooManyRequests {
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t.Errorf("First request should fail with 429, got %d", resp1.StatusCode)
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}
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resp1.Body.Close()
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// Second request should fail
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resp2, _ := http.Get(mock.URL() + "/test")
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if resp2.StatusCode != http.StatusTooManyRequests {
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t.Errorf("Second request should fail with 429, got %d", resp2.StatusCode)
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}
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resp2.Body.Close()
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// Third request should succeed
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resp3, _ := http.Get(mock.URL() + "/test")
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if resp3.StatusCode != http.StatusOK {
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t.Errorf("Third request should succeed, got %d", resp3.StatusCode)
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}
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resp3.Body.Close()
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})
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t.Run("SetRetryAfter", func(t *testing.T) {
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mock := NewMockUpstream("429-with-retry-after-then-success")
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defer mock.Close()
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mock.SetFailUntilCount(1)
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// Set custom retry-after value
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mock.SetRetryAfter("10")
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resp, _ := http.Get(mock.URL() + "/test")
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defer resp.Body.Close()
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if retryAfter := resp.Header.Get("Retry-After"); retryAfter != "10" {
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t.Errorf("Expected Retry-After=10, got %s", retryAfter)
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}
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})
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t.Run("SetDelayMs", func(t *testing.T) {
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mock := NewMockUpstream("success")
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defer mock.Close()
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// Set 100ms delay
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mock.SetDelayMs(100)
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start := time.Now()
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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resp.Body.Close()
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elapsed := time.Since(start)
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// Should take at least 100ms (with some tolerance for test execution)
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if elapsed < 90*time.Millisecond {
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t.Errorf("Expected delay >= 100ms, got %v", elapsed)
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}
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t.Logf("Delay test: %v elapsed", elapsed)
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})
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t.Run("SetCustomHandler", func(t *testing.T) {
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mock := NewMockUpstream("success")
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defer mock.Close()
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// Set custom handler that returns 418
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mock.SetCustomHandler(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(418)
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w.Write([]byte("I'm a teapot"))
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})
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resp, err := http.Get(mock.URL() + "/test")
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if err != nil {
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t.Fatalf("Request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != 418 {
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t.Errorf("Expected status 418, got %d", resp.StatusCode)
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}
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body, _ := io.ReadAll(resp.Body)
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if string(body) != "I'm a teapot" {
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t.Errorf("Expected 'I'm a teapot', got %s", string(body))
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}
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})
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t.Run("ResetCounters", func(t *testing.T) {
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mock := NewMockUpstream("success")
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defer mock.Close()
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// Make some requests
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for i := 0; i < 3; i++ {
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http.Get(mock.URL() + "/test")
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}
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// Verify count is 3
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if count := mock.GetRequestCount(); count != 3 {
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t.Errorf("Expected 3 requests, got %d", count)
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}
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// Reset counters
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mock.ResetCounters()
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// Should be 0 now
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if count := mock.GetRequestCount(); count != 0 {
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t.Errorf("After reset, count should be 0, got %d", count)
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}
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// Make another request
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http.Get(mock.URL() + "/test")
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// Should be 1
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if count := mock.GetRequestCount(); count != 1 {
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t.Errorf("After reset and 1 request, expected 1, got %d", count)
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}
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})
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}
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// TestMockUpstream_ProxyIntegration tests MockUpstream scenarios through the proxy.
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func TestMockUpstream_ProxyIntegration(t *testing.T) {
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ConfigureTestEnv(t)
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t.Setenv(TestMaxRetriesEnv, "2")
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t.Run("success scenario through proxy", func(t *testing.T) {
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mock := NewMockUpstream("success")
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defer mock.Close()
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handler := CreateTestProxyHandler(t, mock.URL(), 2)
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req := CreateNonStreamingMessagesRequest()
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start := time.Now()
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resp := ExecuteProxyRequest(t, handler, req)
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duration := time.Since(start)
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// Should succeed immediately without retries
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Expected status 200, got %d", resp.StatusCode)
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}
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// Should only call upstream once
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if count := mock.GetRequestCount(); count != 1 {
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t.Errorf("Expected 1 upstream call, got %d", count)
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}
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// Should complete quickly (no retry delays)
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if duration > 500*time.Millisecond {
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t.Errorf("Expected fast completion, got %v", duration)
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}
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t.Logf("Success scenario: %v, %d calls", duration, mock.GetRequestCount())
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})
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t.Run("429 with retry after through proxy", func(t *testing.T) {
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mock := NewMockUpstream("429-with-retry-after-then-success")
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defer mock.Close()
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mock.SetFailUntilCount(1)
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mock.SetRetryAfter("1")
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// Reset metrics
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retryAttempts.Reset()
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upstreamErrors.Reset()
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handler := CreateTestProxyHandler(t, mock.URL(), 2)
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req := CreateNonStreamingMessagesRequest()
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start := time.Now()
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resp := ExecuteProxyRequest(t, handler, req)
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duration := time.Since(start)
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// Should succeed after retry
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if resp.StatusCode != http.StatusOK {
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t.Errorf("Expected status 200, got %d", resp.StatusCode)
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}
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// Should call upstream twice (initial + 1 retry)
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if count := mock.GetRequestCount(); count != 2 {
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t.Errorf("Expected 2 upstream calls, got %d", count)
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}
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// Verify retry behavior occurred via call count and timing
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// Metrics are tested separately in response_validation_test.go
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// Should take at least 1 second (Retry-After: 1)
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if duration < 900*time.Millisecond {
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t.Errorf("Expected >=1s delay, got %v", duration)
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}
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t.Logf("429 retry: %v, %d calls", duration, mock.GetRequestCount())
|
|
})
|
|
|
|
t.Run("empty json body through proxy triggers retry", func(t *testing.T) {
|
|
mock := NewMockUpstream("empty-json-body")
|
|
defer mock.Close()
|
|
|
|
// Reset metrics
|
|
retryAttempts.Reset()
|
|
upstreamErrors.Reset()
|
|
|
|
handler := CreateTestProxyHandler(t, mock.URL(), 1)
|
|
req := CreateNonStreamingMessagesRequest()
|
|
|
|
start := time.Now()
|
|
resp := ExecuteProxyRequest(t, handler, req)
|
|
duration := time.Since(start)
|
|
|
|
// Should return 502 after exhausting retries
|
|
if resp.StatusCode != http.StatusBadGateway {
|
|
t.Errorf("Expected status 502, got %d", resp.StatusCode)
|
|
}
|
|
|
|
// Should call upstream twice (initial + 1 retry)
|
|
if count := mock.GetRequestCount(); count != 2 {
|
|
t.Errorf("Expected 2 upstream calls, got %d", count)
|
|
}
|
|
|
|
// Verify error metric
|
|
errorMetric := upstreamErrors.WithLabelValues("truncated_response", "test")
|
|
errorCount := testutil.ToFloat64(errorMetric)
|
|
if errorCount != 2.0 {
|
|
t.Errorf("Expected upstream_errors=2, got %f", errorCount)
|
|
}
|
|
|
|
t.Logf("Empty JSON: %v, %d calls, errors=%f", duration, mock.GetRequestCount(), errorCount)
|
|
})
|
|
|
|
t.Run("invalid json body through proxy triggers retry", func(t *testing.T) {
|
|
mock := NewMockUpstream("invalid-json-body")
|
|
defer mock.Close()
|
|
|
|
// Reset metrics
|
|
retryAttempts.Reset()
|
|
upstreamErrors.Reset()
|
|
|
|
handler := CreateTestProxyHandler(t, mock.URL(), 1)
|
|
req := CreateNonStreamingMessagesRequest()
|
|
|
|
resp := ExecuteProxyRequest(t, handler, req)
|
|
|
|
// Should return 502 after exhausting retries
|
|
if resp.StatusCode != http.StatusBadGateway {
|
|
t.Errorf("Expected status 502, got %d", resp.StatusCode)
|
|
}
|
|
|
|
// Should call upstream twice (initial + 1 retry)
|
|
if count := mock.GetRequestCount(); count != 2 {
|
|
t.Errorf("Expected 2 upstream calls, got %d", count)
|
|
}
|
|
|
|
t.Logf("Invalid JSON: %d calls", mock.GetRequestCount())
|
|
})
|
|
|
|
t.Run("empty streaming through proxy triggers retry", func(t *testing.T) {
|
|
mock := NewMockUpstream("empty-streaming")
|
|
defer mock.Close()
|
|
|
|
// Reset metrics
|
|
retryAttempts.Reset()
|
|
upstreamErrors.Reset()
|
|
|
|
handler := CreateTestProxyHandler(t, mock.URL(), 1)
|
|
req := CreateStreamingMessagesRequest()
|
|
|
|
resp := ExecuteProxyRequest(t, handler, req)
|
|
|
|
// Should return 502 after exhausting retries
|
|
if resp.StatusCode != http.StatusBadGateway {
|
|
t.Errorf("Expected status 502, got %d", resp.StatusCode)
|
|
}
|
|
|
|
// Should call upstream twice (initial + 1 retry)
|
|
if count := mock.GetRequestCount(); count != 2 {
|
|
t.Errorf("Expected 2 upstream calls, got %d", count)
|
|
}
|
|
|
|
// Verify error metric with correct error_type
|
|
errorMetric := upstreamErrors.WithLabelValues("empty_streaming", "test")
|
|
errorCount := testutil.ToFloat64(errorMetric)
|
|
if errorCount != 2.0 {
|
|
t.Errorf("Expected upstream_errors=2 for empty_streaming, got %f", errorCount)
|
|
}
|
|
|
|
t.Logf("Empty streaming: %d calls, errors=%f", mock.GetRequestCount(), errorCount)
|
|
})
|
|
|
|
t.Run("422 no retry through proxy", func(t *testing.T) {
|
|
mock := NewMockUpstream("422-no-retry")
|
|
defer mock.Close()
|
|
|
|
handler := CreateTestProxyHandler(t, mock.URL(), 2)
|
|
req := CreateNonStreamingMessagesRequest()
|
|
|
|
resp := ExecuteProxyRequest(t, handler, req)
|
|
|
|
// Should return 422 without retry
|
|
if resp.StatusCode != http.StatusUnprocessableEntity {
|
|
t.Errorf("Expected status 422, got %d", resp.StatusCode)
|
|
}
|
|
|
|
// Should only call upstream once (no retry)
|
|
if count := mock.GetRequestCount(); count != 1 {
|
|
t.Errorf("Expected 1 upstream call (no retry), got %d", count)
|
|
}
|
|
|
|
t.Logf("422 no retry: %d calls", mock.GetRequestCount())
|
|
})
|
|
|
|
t.Run("500 no retry through proxy", func(t *testing.T) {
|
|
mock := NewMockUpstream("500-no-retry")
|
|
defer mock.Close()
|
|
|
|
handler := CreateTestProxyHandler(t, mock.URL(), 2)
|
|
req := CreateNonStreamingMessagesRequest()
|
|
|
|
resp := ExecuteProxyRequest(t, handler, req)
|
|
|
|
// Should return 500 without retry
|
|
if resp.StatusCode != http.StatusInternalServerError {
|
|
t.Errorf("Expected status 500, got %d", resp.StatusCode)
|
|
}
|
|
|
|
// Should only call upstream once (no retry)
|
|
if count := mock.GetRequestCount(); count != 1 {
|
|
t.Errorf("Expected 1 upstream call (no retry), got %d", count)
|
|
}
|
|
|
|
t.Logf("500 no retry: %d calls", mock.GetRequestCount())
|
|
})
|
|
|
|
t.Run("404 no retry through proxy", func(t *testing.T) {
|
|
mock := NewMockUpstream("404-no-retry")
|
|
defer mock.Close()
|
|
|
|
handler := CreateTestProxyHandler(t, mock.URL(), 2)
|
|
req := CreateNonStreamingMessagesRequest()
|
|
|
|
resp := ExecuteProxyRequest(t, handler, req)
|
|
|
|
// Should return 404 without retry
|
|
if resp.StatusCode != http.StatusNotFound {
|
|
t.Errorf("Expected status 404, got %d", resp.StatusCode)
|
|
}
|
|
|
|
// Should only call upstream once (no retry)
|
|
if count := mock.GetRequestCount(); count != 1 {
|
|
t.Errorf("Expected 1 upstream call (no retry), got %d", count)
|
|
}
|
|
|
|
t.Logf("404 no retry: %d calls", mock.GetRequestCount())
|
|
})
|
|
}
|
|
|
|
// jsonValid checks if a response body contains valid JSON
|
|
func jsonValid(t *testing.T, resp *http.Response) bool {
|
|
t.Helper()
|
|
body, err := io.ReadAll(resp.Body)
|
|
if err != nil {
|
|
t.Errorf("Failed to read body: %v", err)
|
|
return false
|
|
}
|
|
return json.Valid(body)
|
|
}
|