feat: support goctl --module to set go module (#5135)

tools/goctl/util/ctx/context_test.go

@@ -1,9 +1,12 @@
 package ctx
 
 import (
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestBackground(t *testing.T) {
@@ -20,3 +23,130 @@ func TestBackgroundNilWorkDir(t *testing.T) {
 	_, err := Prepare(workDir)
 	assert.NotNil(t, err)
 }
+
+func TestPrepareWithModule(t *testing.T) {
+	tests := []struct {
+		name       string
+		moduleName string
+		expectMod  string
+	}{
+		{
+			name:       "custom module name",
+			moduleName: "github.com/example/testmodule",
+			expectMod:  "github.com/example/testmodule",
+		},
+		{
+			name:       "simple module name",
+			moduleName: "simplemodule",
+			expectMod:  "simplemodule",
+		},
+		{
+			name:       "empty module name uses directory",
+			moduleName: "",
+			expectMod:  "", // Will be set to directory name
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Create a temporary directory for testing
+			tempDir, err := os.MkdirTemp("", "goctl-ctx-test-*")
+			require.NoError(t, err)
+			defer os.RemoveAll(tempDir)
+
+			testDir := filepath.Join(tempDir, "testproject")
+			err = os.MkdirAll(testDir, 0755)
+			require.NoError(t, err)
+
+			ctx, err := PrepareWithModule(testDir, tt.moduleName)
+			assert.NoError(t, err)
+			assert.NotNil(t, ctx)
+
+			// Check that the context has expected values
+			assert.NotEmpty(t, ctx.WorkDir)
+			assert.NotEmpty(t, ctx.Name)
+			assert.NotEmpty(t, ctx.Path)
+			assert.NotEmpty(t, ctx.Dir)
+
+			// Check that go.mod was created
+			goModPath := filepath.Join(testDir, "go.mod")
+			assert.FileExists(t, goModPath)
+
+			// Verify module name in go.mod
+			content, err := os.ReadFile(goModPath)
+			require.NoError(t, err)
+
+			expectedModule := tt.expectMod
+			if expectedModule == "" {
+				expectedModule = "testproject" // directory name fallback
+			}
+
+			assert.Contains(t, string(content), "module "+expectedModule)
+			assert.Equal(t, expectedModule, ctx.Path)
+		})
+	}
+}
+
+func TestPrepareWithModule_ExistingGoMod(t *testing.T) {
+	// Create a temporary directory with existing go.mod
+	tempDir, err := os.MkdirTemp("", "goctl-ctx-test-*")
+	require.NoError(t, err)
+	defer os.RemoveAll(tempDir)
+
+	testDir := filepath.Join(tempDir, "existingproject")
+	err = os.MkdirAll(testDir, 0755)
+	require.NoError(t, err)
+
+	// Create existing go.mod file
+	existingGoMod := `module existing.com/project
+
+go 1.21
+`
+	goModPath := filepath.Join(testDir, "go.mod")
+	err = os.WriteFile(goModPath, []byte(existingGoMod), 0644)
+	require.NoError(t, err)
+
+	// PrepareWithModule should use existing go.mod, not create new one
+	ctx, err := PrepareWithModule(testDir, "github.com/new/module")
+	assert.NoError(t, err)
+	assert.NotNil(t, ctx)
+
+	// Should use existing module name, not the provided one
+	assert.Equal(t, "existing.com/project", ctx.Path)
+
+	// Verify go.mod still contains original content
+	content, err := os.ReadFile(goModPath)
+	require.NoError(t, err)
+	assert.Contains(t, string(content), "module existing.com/project")
+	assert.NotContains(t, string(content), "module github.com/new/module")
+}
+
+func TestPrepareWithModule_InvalidWorkDir(t *testing.T) {
+	_, err := PrepareWithModule("/non/existent/path", "github.com/example/test")
+	assert.Error(t, err)
+}
+
+func TestPrepare_CallsPrepareWithModule(t *testing.T) {
+	// Create a temporary directory for testing
+	tempDir, err := os.MkdirTemp("", "goctl-ctx-test-*")
+	require.NoError(t, err)
+	defer os.RemoveAll(tempDir)
+
+	testDir := filepath.Join(tempDir, "testproject")
+	err = os.MkdirAll(testDir, 0755)
+	require.NoError(t, err)
+
+	// Test that Prepare calls PrepareWithModule with empty string
+	ctx1, err1 := Prepare(testDir)
+	require.NoError(t, err1)
+
+	// Clean up go.mod to test again
+	os.Remove(filepath.Join(testDir, "go.mod"))
+
+	ctx2, err2 := PrepareWithModule(testDir, "")
+	require.NoError(t, err2)
+
+	// Should produce identical results
+	assert.Equal(t, ctx1.Path, ctx2.Path)
+	assert.Equal(t, ctx1.Name, ctx2.Name)
+}