Mock os call

Author: vbrown608

go/porcelain/deploy.go

@@ -500,9 +500,11 @@ func (n *Netlify) uploadFile(ctx context.Context, d *models.Deploy, f *FileBundl
 	}
 }
 
+var getwd = os.Getwd
+
 func walk(dir string, observer DeployObserver, useLargeMedia bool) (*deployFiles, error) {
 	files := newDeployFiles()
-	cwd, err := os.Getwd()
+	cwd, err := getwd()
 	if err != nil {
 		return nil, err
 	}

go/porcelain/deploy_test.go

@@ -150,23 +150,17 @@ func TestWalk_IgnoreNodeModulesInRoot(t *testing.T) {
 	err = ioutil.WriteFile(filepath.Join(dir, "more", "node_modules", "inner-package"), []byte{}, 0644)
 	require.Nil(t, err)
 
+	// When deploy directory != build directory, always deploy node_modules.
+	getwd = func() (string, error) { return "elsewhere", nil }
 	files, err := walk(dir, mockObserver{}, false)
 	require.Nil(t, err)
-
-	// When deploy directory != build directory, always deploy node_modules.
 	assert.NotNil(t, files.Files["node_modules/root-package"])
 	assert.NotNil(t, files.Files["more/node_modules/inner-package"])
 
-	cwd, err := os.Getwd()
-	require.Nil(t, err)
-	err = os.Chdir(dir)
-	require.Nil(t, err)
-	defer os.Chdir(cwd)
-
+	// When deploy directory == build directory, ignore node_modules in deploy directory root.
+	getwd = func() (string, error) { return dir, nil }
 	files, err = walk(dir, mockObserver{}, false)
 	require.Nil(t, err)
-
-	// When deploy directory == build directory, ignore node_modules in deploy directory root.
 	assert.Nil(t, files.Files["node_modules/root-package"])
 	assert.NotNil(t, files.Files["more/node_modules/inner-package"])
 }