Add unit test for GetMostRecentTag

api/provenance/provenance.go

@@ -67,14 +67,14 @@ func GetProvenance() Provenance {
 
 	for _, dep := range info.Deps {
 		if dep != nil && dep.Path == "sigs.k8s.io/kustomize/kustomize/v5" {
-			p.Version = getMostRecentTag(*dep)
+			p.Version = GetMostRecentTag(*dep)
 		}
 	}
 
 	return p
 }
 
-func getMostRecentTag(m debug.Module) string {
+func GetMostRecentTag(m debug.Module) string {
 	for m.Replace != nil {
 		m = *m.Replace
 	}

api/provenance/provenance_test.go

@@ -5,6 +5,7 @@ package provenance_test
 
 import (
 	"fmt"
+	"runtime/debug"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -45,3 +46,52 @@ func TestProvenance_Semver(t *testing.T) {
 	p.Version = "kustomize/v4.11.12"
 	assert.Equal(t, "v4.11.12", p.Semver())
 }
+
+func mockModule(version string) debug.Module {
+	return debug.Module{
+		Path:    "sigs.k8s.io/kustomize/kustomize/v5",
+		Version: version,
+		Replace: nil,
+	}
+}
+
+func TestGetMostRecentTag(t *testing.T) {
+	tests := []struct {
+		name        string
+		module      debug.Module
+		expectedTag string
+	}{
+		{
+			name:        "Standard version",
+			module:      mockModule("v1.2.3"),
+			expectedTag: "v1.2.3",
+		},
+		{
+			name:        "Pseudo-version with patch increment",
+			module:      mockModule("v0.0.0-20210101010101-abcdefabcdef"),
+			expectedTag: "v0.0.0",
+		},
+		{
+			name:        "Invalid semver string",
+			module:      mockModule("invalid-version"),
+			expectedTag: "unknown",
+		},
+		{
+			name:        "Valid semver with patch increment and pre-release info",
+			module:      mockModule("v1.2.3-0.20210101010101-abcdefabcdef"),
+			expectedTag: "v1.2.2",
+		},
+		{
+			name:        "Valid semver no patch increment",
+			module:      mockModule("v1.2.0"),
+			expectedTag: "v1.2.0",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tag := provenance.GetMostRecentTag(tt.module)
+			assert.Equal(t, tt.expectedTag, tag)
+		})
+	}
+}