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//go:build unit
          
          
// +build unit
package main
import (
          
          
“testing”
“time”
)
func TestTraceNoArgs(t *testing.T) {
          
          
cmd := cmdTestCase{
args:   “trace”,
assert: assertError(“either <resource>/<name> or <resource> <name> is required as an argument”),
}
cmd.runTestCmd(t)
}
func toLocalTime(t *testing.T, in string) string {
          
          
ts, err := time.Parse(time.RFC3339, in)
if err != nil {
t.Fatalf(“Error converting golden test time ‘%s’: %v”, in, err)
}
return ts.Local().String()
}
func TestTrace(t *testing.T) {
          
          
cases := []struct {
name       string
args       string
objectFile string
goldenFile string
tmpl       map[string]string
}{
{
“Deployment”,
“trace podinfo –kind deployment –api-version=apps/v1”,
“testdata/trace/deployment.yaml”,
“testdata/trace/deployment.golden”,
map[string]string{
“ns”:                          allocateNamespace(“podinfo”),
“fluxns”:                      allocateNamespace(“flux-system”),
“helmReleaseLastReconcile”:    toLocalTime(t, “2021-07-16T15:42:20Z”),
“helmChartLastReconcile”:      toLocalTime(t, “2021-07-16T15:32:09Z”),
“helmRepositoryLastReconcile”: toLocalTime(t, “2021-07-11T00:25:46Z”),
},
},
{
“HelmRelease”,
“trace podinfo –kind HelmRelease –api-version=helm.toolkit.fluxcd.io/v2beta2”,
“testdata/trace/helmrelease.yaml”,
“testdata/trace/helmrelease.golden”,
map[string]string{
“ns”:                         allocateNamespace(“podinfo”),
“fluxns”:                     allocateNamespace(“flux-system”),
“kustomizationLastReconcile”: toLocalTime(t, “2021-08-01T04:52:56Z”),
“gitRepositoryLastReconcile”: toLocalTime(t, “2021-07-20T00:48:16Z”),
},
},
{
“HelmRelease from OCI registry”,
“trace podinfo –kind HelmRelease –api-version=helm.toolkit.fluxcd.io/v2beta2”,
“testdata/trace/helmrelease-oci.yaml”,
“testdata/trace/helmrelease-oci.golden”,
map[string]string{
“ns”:                         allocateNamespace(“podinfo”),
“fluxns”:                     allocateNamespace(“flux-system”),
“kustomizationLastReconcile”: toLocalTime(t, “2021-08-01T04:52:56Z”),
“ociRepositoryLastReconcile”: toLocalTime(t, “2021-07-20T00:48:16Z”),
},
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
testEnv.CreateObjectFile(tc.objectFile, tc.tmpl, t)
cmd := cmdTestCase{
args:   tc.args + ” -n=” + tc.tmpl[“ns”],
assert: assertGoldenTemplateFile(tc.goldenFile, tc.tmpl),
}
cmd.runTestCmd(t)
})
}
}

Explanation

This code defines tests for the trace command in the Flux v2 CLI. The trace command displays the reconciliation history of Kubernetes resources.

Test Cases

The TestTraceNoArgs test checks that the command fails if it is not provided with the required arguments (<resource>/<name> or <resource> <name>).

The TestTrace test suite covers various scenarios, using different resource types:

Deployment: This tests tracing a deployment object.
HelmRelease: This tests tracing a HelmRelease object.
HelmRelease from OCI registry: This tests tracing a HelmRelease object that uses an OCI registry.

Test Logic

Each test case in the TestTrace suite uses a golden file to compare the output of the trace command with the expected output. The golden file is a template containing placeholders that are replaced with actual values during the test.

Here’s a breakdown of the steps involved:

Create a Test Object: The CreateObjectFile function creates a YAML file representing the resource object under test. This file is used as input to the trace command.
Run the trace Command: The runTestCmd function executes the trace command with the specified arguments.
Compare Output with Golden File: The assertGoldenTemplateFile function compares the actual output of the trace command with the content of the golden file, after replacing the placeholders in the golden file with actual values.

Helper Functions

toLocalTime: This helper function converts a UTC timestamp string to a local timestamp string.
allocateNamespace: This helper function allocates a unique namespace for testing.

Conclusion

This code provides comprehensive testing for the trace command, ensuring that it correctly handles different resource types and displays accurate reconciliation history information. It uses golden files and template replacement for a robust and maintainable approach to testing.

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