adding tests to ensure we have at least some regression

cmd/gitops/app/version/cmd_test.go

@@ -0,0 +1,51 @@
+package version
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/weaveworks/weave-gitops/cmd/gitops/version"
+)
+
+// TestVersionCommand serves as regression point for gitops version command
+// which comes directly from weave gitops oss. It ensures that the command
+// is available and generating the expeted output.
+func TestVersionCommand(t *testing.T) {
+	cmd := version.Cmd
+	cmd.SetArgs([]string{})
+
+	version.Version = "v1.0.0"
+	version.GitCommit = "abcd"
+	version.Branch = "main"
+	version.BuildTime = "2023-09-12_16:25:01"
+
+	// capture stdout to be able to assert version content
+	originalStdout := os.Stdout
+	reader, writer, _ := os.Pipe()
+	os.Stdout = writer
+
+	err := cmd.Execute()
+	assert.NoError(t, err)
+
+	//read command output from buffer
+	writer.Close()
+	var capturedOutput string
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, reader)
+	assert.NoError(t, err)
+	capturedOutput = buf.String()
+	fmt.Println(capturedOutput)
+
+	os.Stdout = originalStdout
+
+	//assert version has been properly generated
+	assert.Contains(t, capturedOutput, fmt.Sprintf("Current Version: %s", version.Version))
+	assert.Contains(t, capturedOutput, fmt.Sprintf("GitCommit: %s", version.GitCommit))
+	assert.Contains(t, capturedOutput, fmt.Sprintf("BuildTime: %s", version.BuildTime))
+	assert.Contains(t, capturedOutput, fmt.Sprintf("Branch: %s", version.Branch))
+
+}