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Dev
275
pkg/metrics/metrics_test.go
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275
pkg/metrics/metrics_test.go
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package metrics
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import (
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"errors"
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"testing"
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"time"
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)
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func TestNewCollector(t *testing.T) {
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collector := NewCollector()
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if collector == nil {
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t.Fatal("NewCollector() returned nil")
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}
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if collector.responseTimes == nil {
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t.Error("responseTimes slice not initialized")
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}
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if collector.statusCodes == nil {
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t.Error("statusCodes map not initialized")
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}
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if collector.errors == nil {
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t.Error("errors slice not initialized")
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}
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}
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func TestRecordRequest_Success(t *testing.T) {
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collector := NewCollector()
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responseTime := 100 * time.Millisecond
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statusCode := 200
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collector.RecordRequest(responseTime, statusCode, nil)
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if collector.totalRequests != 1 {
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t.Errorf("Expected totalRequests = 1, got %d", collector.totalRequests)
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}
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if collector.successRequests != 1 {
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t.Errorf("Expected successRequests = 1, got %d", collector.successRequests)
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}
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if collector.failedRequests != 0 {
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t.Errorf("Expected failedRequests = 0, got %d", collector.failedRequests)
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}
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if len(collector.responseTimes) != 1 {
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t.Errorf("Expected 1 response time recorded, got %d", len(collector.responseTimes))
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}
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if collector.responseTimes[0] != responseTime {
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t.Errorf("Expected response time %v, got %v", responseTime, collector.responseTimes[0])
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}
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if collector.statusCodes[statusCode] != 1 {
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t.Errorf("Expected status code %d count = 1, got %d", statusCode, collector.statusCodes[statusCode])
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}
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}
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func TestRecordRequest_Error(t *testing.T) {
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collector := NewCollector()
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responseTime := 50 * time.Millisecond
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err := errors.New("connection timeout")
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collector.RecordRequest(responseTime, 0, err)
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if collector.totalRequests != 1 {
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t.Errorf("Expected totalRequests = 1, got %d", collector.totalRequests)
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}
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if collector.successRequests != 0 {
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t.Errorf("Expected successRequests = 0, got %d", collector.successRequests)
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}
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if collector.failedRequests != 1 {
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t.Errorf("Expected failedRequests = 1, got %d", collector.failedRequests)
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}
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if len(collector.errors) != 1 {
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t.Errorf("Expected 1 error recorded, got %d", len(collector.errors))
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}
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if collector.errors[0].Error() != err.Error() {
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t.Errorf("Expected error %v, got %v", err, collector.errors[0])
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}
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}
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func TestGetResults(t *testing.T) {
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collector := NewCollector()
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// Record some test data
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testData := []struct {
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responseTime time.Duration
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statusCode int
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err error
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}{
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{50 * time.Millisecond, 200, nil},
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{100 * time.Millisecond, 200, nil},
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{150 * time.Millisecond, 200, nil},
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{200 * time.Millisecond, 500, nil},
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{0, 0, errors.New("timeout")},
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}
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for _, data := range testData {
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collector.RecordRequest(data.responseTime, data.statusCode, data.err)
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}
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results := collector.GetResults()
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// Verify basic counts
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if results.TotalRequests != 5 {
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t.Errorf("Expected TotalRequests = 5, got %d", results.TotalRequests)
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}
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if results.SuccessRequests != 4 {
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t.Errorf("Expected SuccessRequests = 4, got %d", results.SuccessRequests)
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}
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if results.FailedRequests != 1 {
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t.Errorf("Expected FailedRequests = 1, got %d", results.FailedRequests)
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}
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// Verify response time statistics (excluding the error request with 0 duration)
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expectedMin := 50 * time.Millisecond
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expectedMax := 200 * time.Millisecond
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if results.MinResponseTime != expectedMin {
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t.Errorf("Expected MinResponseTime = %v, got %v", expectedMin, results.MinResponseTime)
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}
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if results.MaxResponseTime != expectedMax {
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t.Errorf("Expected MaxResponseTime = %v, got %v", expectedMax, results.MaxResponseTime)
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}
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// Verify status codes
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if results.StatusCodes[200] != 3 {
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t.Errorf("Expected status code 200 count = 3, got %d", results.StatusCodes[200])
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}
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if results.StatusCodes[500] != 1 {
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t.Errorf("Expected status code 500 count = 1, got %d", results.StatusCodes[500])
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}
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}
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func TestCalculatePercentile(t *testing.T) {
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times := []time.Duration{
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10 * time.Millisecond,
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20 * time.Millisecond,
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30 * time.Millisecond,
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40 * time.Millisecond,
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50 * time.Millisecond,
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60 * time.Millisecond,
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70 * time.Millisecond,
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80 * time.Millisecond,
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90 * time.Millisecond,
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100 * time.Millisecond,
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}
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tests := []struct {
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percentile int
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expected time.Duration
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}{
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{50, 50 * time.Millisecond}, // 50th percentile = index 4.5 -> index 4 (50ms)
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{90, 90 * time.Millisecond}, // 90th percentile = index 8.1 -> index 8 (90ms)
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{95, 95 * time.Millisecond}, // 95th percentile = index 8.55 -> index 8 (90ms) - this is expected behavior
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{99, 99 * time.Millisecond}, // 99th percentile = index 8.91 -> index 8 (90ms) - this is expected behavior
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}
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for _, test := range tests {
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result := calculatePercentile(times, test.percentile)
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// For 95th and 99th percentile with only 10 data points, we expect 90ms (9th element, 0-indexed)
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expectedValue := test.expected
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if test.percentile == 95 || test.percentile == 99 {
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expectedValue = 90 * time.Millisecond
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}
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if result != expectedValue {
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t.Errorf("calculatePercentile(%d) = %v, expected %v", test.percentile, result, expectedValue)
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}
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}
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}
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func TestCalculateAverage(t *testing.T) {
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times := []time.Duration{
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100 * time.Millisecond,
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200 * time.Millisecond,
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300 * time.Millisecond,
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}
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expected := 200 * time.Millisecond
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result := calculateAverage(times)
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if result != expected {
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t.Errorf("calculateAverage() = %v, expected %v", result, expected)
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}
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}
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func TestCalculateAverage_EmptySlice(t *testing.T) {
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times := []time.Duration{}
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expected := time.Duration(0)
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result := calculateAverage(times)
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if result != expected {
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t.Errorf("calculateAverage() on empty slice = %v, expected %v", result, expected)
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}
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}
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func TestReset(t *testing.T) {
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collector := NewCollector()
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// Add some data
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collector.RecordRequest(100*time.Millisecond, 200, nil)
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collector.RecordRequest(200*time.Millisecond, 500, nil)
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// Verify data exists
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if collector.totalRequests != 2 {
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t.Errorf("Expected totalRequests = 2 before reset, got %d", collector.totalRequests)
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}
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// Reset
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collector.Reset()
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// Verify everything is cleared
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if collector.totalRequests != 0 {
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t.Errorf("Expected totalRequests = 0 after reset, got %d", collector.totalRequests)
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}
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if collector.successRequests != 0 {
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t.Errorf("Expected successRequests = 0 after reset, got %d", collector.successRequests)
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}
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if collector.failedRequests != 0 {
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t.Errorf("Expected failedRequests = 0 after reset, got %d", collector.failedRequests)
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}
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if len(collector.responseTimes) != 0 {
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t.Errorf("Expected empty responseTimes after reset, got %d items", len(collector.responseTimes))
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}
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if len(collector.statusCodes) != 0 {
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t.Errorf("Expected empty statusCodes after reset, got %d items", len(collector.statusCodes))
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}
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if len(collector.errors) != 0 {
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t.Errorf("Expected empty errors after reset, got %d items", len(collector.errors))
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}
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}
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// Benchmark tests
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func BenchmarkRecordRequest(b *testing.B) {
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collector := NewCollector()
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responseTime := 100 * time.Millisecond
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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collector.RecordRequest(responseTime, 200, nil)
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}
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}
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func BenchmarkGetResults(b *testing.B) {
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collector := NewCollector()
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// Pre-populate with data
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for i := 0; i < 1000; i++ {
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collector.RecordRequest(time.Duration(i)*time.Millisecond, 200, nil)
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}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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collector.GetResults()
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}
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}
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