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added unit tests for instrument package and addressed review comments
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package instrument | ||
|
|
||
| import ( | ||
| "errors" | ||
| "strconv" | ||
| "testing" | ||
|
|
||
| "github.com/gardener/machine-controller-manager/pkg/util/provider/machinecodes/codes" | ||
| "github.com/gardener/machine-controller-manager/pkg/util/provider/machinecodes/status" | ||
| "github.com/gardener/machine-controller-manager/pkg/util/provider/metrics" | ||
| . "github.com/onsi/gomega" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/testutil" | ||
| ) | ||
|
|
||
| var ( | ||
| testErr = errors.New("test-error") | ||
| defaultErrorCode = strconv.Itoa(int(codes.Internal)) | ||
| testStatusErr = status.New(codes.InvalidArgument, "test-status-error") | ||
| ) | ||
|
|
||
| const serviceName = "test-service" | ||
|
|
||
| func TestAPIMetricRecorderFn(t *testing.T) { | ||
| testCases := []struct { | ||
| name string | ||
| err error | ||
| }{ | ||
| {"assert that function captures failed API request count when the error is not nil", testErr}, | ||
| {"assert that function captures successful API request count when the error is nil", nil}, | ||
| } | ||
| g := NewWithT(t) | ||
| reg := prometheus.NewRegistry() | ||
| g.Expect(reg.Register(metrics.APIRequestCount)).To(Succeed()) | ||
| g.Expect(reg.Register(metrics.APIFailedRequestCount)).To(Succeed()) | ||
| for _, tc := range testCases { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| defer metrics.APIRequestCount.Reset() | ||
| defer metrics.APIFailedRequestCount.Reset() | ||
| _ = deferredMetricsRecorderInvoker(tc.err != nil, false, AZAPIMetricRecorderFn) | ||
| if tc.err != nil { | ||
| g.Expect(testutil.CollectAndCount(metrics.APIFailedRequestCount)).To(Equal(1)) | ||
| g.Expect(testutil.ToFloat64(metrics.APIFailedRequestCount.WithLabelValues(prometheusProviderLabelValue, serviceName))).To(Equal(float64(1))) | ||
| } else { | ||
| g.Expect(testutil.CollectAndCount(metrics.APIRequestCount)).To(Equal(1)) | ||
| g.Expect(testutil.ToFloat64(metrics.APIRequestCount.WithLabelValues(prometheusProviderLabelValue, serviceName))).To(Equal(float64(1))) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func TestDriverAPIMetricRecorderFn(t *testing.T) { | ||
| testCases := []struct { | ||
| name string | ||
| err error | ||
| }{ | ||
| {"assert that function captures failed driver API request with default error code for internal error when there is an error", testErr}, | ||
| {"assert that function captures failed driver API request with error code from status.Status on error", testStatusErr}, | ||
| {"assert that function captures successful driver API request count when the error is nil", nil}, | ||
| } | ||
| g := NewWithT(t) | ||
| reg := prometheus.NewRegistry() | ||
| g.Expect(reg.Register(metrics.DriverFailedAPIRequests)).To(Succeed()) | ||
| for _, tc := range testCases { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| defer metrics.DriverFailedAPIRequests.Reset() | ||
| _ = deferredMetricsRecorderInvoker(tc.err != nil, isStatusErr(tc.err), DriverAPIMetricRecorderFn) | ||
| if tc.err != nil { | ||
| expectedErrCode := getExpectedErrorCode(tc.err) | ||
| g.Expect(testutil.CollectAndCount(metrics.DriverFailedAPIRequests)).To(Equal(1)) | ||
| g.Expect(testutil.ToFloat64(metrics.DriverFailedAPIRequests.WithLabelValues(prometheusProviderLabelValue, serviceName, expectedErrCode))).To(Equal(float64(1))) | ||
| } else { | ||
| g.Expect(testutil.CollectAndCount(metrics.DriverFailedAPIRequests)).To(Equal(0)) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func isStatusErr(err error) bool { | ||
| if err == nil { | ||
| return false | ||
| } | ||
| var statusErr *status.Status | ||
| return errors.As(err, &statusErr) | ||
| } | ||
|
|
||
| func getExpectedErrorCode(err error) string { | ||
| if err == nil { | ||
| return "" | ||
| } | ||
| var statusErr *status.Status | ||
| if errors.As(err, &statusErr) { | ||
| return strconv.Itoa(int(statusErr.Code())) | ||
| } else { | ||
| return defaultErrorCode | ||
| } | ||
| } | ||
|
|
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| type recorderFn func(string, *error) func() | ||
|
|
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| func deferredMetricsRecorderInvoker(shouldReturnErr bool, isStatusErr bool, fn recorderFn) (err error) { | ||
| defer fn(serviceName, &err)() | ||
| if shouldReturnErr { | ||
| if isStatusErr { | ||
| err = testStatusErr | ||
| } else { | ||
| err = testErr | ||
| } | ||
| } | ||
| return | ||
| } |
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46 changes: 46 additions & 0 deletions
46
vendor/github.com/prometheus/client_golang/prometheus/testutil/lint.go
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