Change error message to indicate missing file (#7)

Signed-off-by: Zabil Cheriya Maliackal <zabilcm@gmail.com>

common.go

@@ -70,15 +70,15 @@ type Property struct {
 func GetProjectRoot() (string, error) {
 	pwd, err := os.Getwd()
 	if err != nil {
-		return "", fmt.Errorf("Failed to find project root directory. %s\n", err.Error())
+		return "", fmt.Errorf("Failed to find Gauge project root directory. Missing manifest.json file: %s\n", err.Error())
 	}
 	return findManifestInPath(pwd)
 }
 
 func findManifestInPath(pwd string) (string, error) {
 	wd, err := filepath.Abs(pwd)
 	if err != nil {
-		return "", fmt.Errorf("Failed to find project directory: %s", err)
+		return "", fmt.Errorf("Failed to find Gauge project directory. Missing manifest.json file: %s", err)
 	}
 	manifestExists := func(dir string) bool {
 		return FileExists(filepath.Join(dir, ManifestFile))
@@ -90,12 +90,12 @@ func findManifestInPath(pwd string) (string, error) {
 			return dir, nil
 		}
 		if dir == filepath.Clean(fmt.Sprintf("%c", os.PathSeparator)) || dir == "" {
-			return "", fmt.Errorf("Failed to find project directory")
+			return "", fmt.Errorf("Failed to find Gauge project directory. Missing manifest.json file.")
 		}
 		oldDir := dir
 		dir = filepath.Clean(fmt.Sprintf("%s%c..", dir, os.PathSeparator))
 		if dir == oldDir {
-			return "", fmt.Errorf("Failed to find project directory")
+			return "", fmt.Errorf("Failed to find Gauge project directory. Missing manifest.json file.")
 		}
 	}
 }

common_test.go

@@ -106,7 +106,7 @@ func (s *MySuite) TestGetProjectFailing(c *C) {
 
 	_, err := GetProjectRoot()
 	c.Assert(err, NotNil)
-	c.Assert(err.Error(), Equals, "Failed to find project directory")
+	c.Assert(err.Error(), Equals, "Failed to find Gauge project directory. Missing manifest.json file.")
 }
 
 func (s *MySuite) TestGetDirInProject(c *C) {
@@ -238,7 +238,7 @@ func (s *MySuite) TestGetProjectRootGivesErrorWhenProvidedInvalidSpecFilePath(c
 
 	root, err := GetProjectRootFromSpecPath("/specs/nested/deep_nested/deep_nested.spec")
 
-	c.Assert(err.Error(), Equals, fmt.Sprintf("Failed to find project directory"))
+	c.Assert(err.Error(), Equals, fmt.Sprintf("Failed to find Gauge project directory. Missing manifest.json file."))
 	c.Assert(root, Equals, "")
 }