add unit tests to stack package

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

cli/command/stack/opts_test.go

@@ -0,0 +1,49 @@
+package stack
+
+import (
+	"bytes"
+	"fmt"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLoadBundlefileErrors(t *testing.T) {
+	testCases := []struct {
+		namespace     string
+		path          string
+		expectedError error
+	}{
+		{
+			namespace:     "namespace_foo",
+			expectedError: fmt.Errorf("Bundle %s.dab not found", "namespace_foo"),
+		},
+		{
+			namespace:     "namespace_foo",
+			path:          "invalid_path",
+			expectedError: fmt.Errorf("Bundle %s not found", "invalid_path"),
+		},
+		{
+			namespace:     "namespace_foo",
+			path:          filepath.Join("testdata", "bundlefile_with_invalid_syntax"),
+			expectedError: fmt.Errorf("Error reading"),
+		},
+	}
+
+	for _, tc := range testCases {
+		_, err := loadBundlefile(&bytes.Buffer{}, tc.namespace, tc.path)
+		assert.Error(t, err, tc.expectedError)
+	}
+}
+
+func TestLoadBundlefile(t *testing.T) {
+	buf := new(bytes.Buffer)
+
+	namespace := ""
+	path := filepath.Join("testdata", "bundlefile_with_two_services.dab")
+	bundleFile, err := loadBundlefile(buf, namespace, path)
+
+	assert.NoError(t, err)
+	assert.Equal(t, len(bundleFile.Services), 2)
+}