test: add tests for retrieving the version (#23572)

Signed-off-by: nitishfy <justnitish06@gmail.com>

common/version_test.go

@@ -0,0 +1,82 @@
+package common
+
+import (
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetVersion(t *testing.T) {
+	tests := []struct {
+		name           string
+		inputGitCommit string
+		inputGitTag    string
+		inputTreeState string
+		inputVersion   string
+		expected       string
+	}{
+		{
+			name:           "Official release with tag and clean state",
+			inputGitCommit: "abcdef123456",
+			inputGitTag:    "v1.2.3",
+			inputTreeState: "clean",
+			inputVersion:   "1.2.3",
+			expected:       "v1.2.3",
+		},
+		{
+			name:           "Dirty state with commit",
+			inputGitCommit: "deadbeefcafebabe",
+			inputGitTag:    "",
+			inputTreeState: "dirty",
+			inputVersion:   "2.0.1",
+			expected:       "v2.0.1+deadbee.dirty",
+		},
+		{
+			name:           "Clean state with commit, no tag",
+			inputGitCommit: "cafebabedeadbeef",
+			inputGitTag:    "",
+			inputTreeState: "clean",
+			inputVersion:   "2.1.0",
+			expected:       "v2.1.0+cafebab",
+		},
+		{
+			name:           "Missing commit and tag",
+			inputGitCommit: "",
+			inputGitTag:    "",
+			inputTreeState: "clean",
+			inputVersion:   "3.1.0",
+			expected:       "v3.1.0+unknown",
+		},
+		{
+			name:           "Short commit",
+			inputGitCommit: "abc",
+			inputGitTag:    "",
+			inputTreeState: "clean",
+			inputVersion:   "4.0.0",
+			expected:       "v4.0.0+unknown",
+		},
+	}
+	for _, tt := range tests {
+		gitCommit = tt.inputGitCommit
+		gitTag = tt.inputGitTag
+		gitTreeState = tt.inputTreeState
+		version = tt.inputVersion
+
+		buildDate = "2025-06-26"
+		kubectlVersion = "v1.30.0"
+		extraBuildInfo = "test-build"
+
+		got := GetVersion()
+		assert.Equal(t, tt.expected, got.Version)
+		assert.Equal(t, buildDate, got.BuildDate)
+		assert.Equal(t, tt.inputGitCommit, got.GitCommit)
+		assert.Equal(t, tt.inputGitTag, got.GitTag)
+		assert.Equal(t, tt.inputTreeState, got.GitTreeState)
+		assert.Equal(t, runtime.Version(), got.GoVersion)
+		assert.Equal(t, runtime.Compiler, got.Compiler)
+		assert.Equal(t, runtime.GOOS+"/"+runtime.GOARCH, got.Platform)
+		assert.Equal(t, kubectlVersion, got.KubectlVersion)
+		assert.Equal(t, extraBuildInfo, got.ExtraBuildInfo)
+	}
+}