Revise error msg for create new document with empty path or filename

file/create.go

@@ -12,13 +12,18 @@ import (
 // after the check, or the user might not have permission to create the file.
 func ValidateCreate(path string) error {
 	dir, filename := filepath.Split(path)
-	dir = filepath.Clean(dir)
 
 	// If the filename is empty, return an error.
 	if filename == "" {
-		return fmt.Errorf("File name cannot be empty")
+		if dir == "" {
+			return fmt.Errorf("File path is empty")
+		} else {
+			return fmt.Errorf("File path must end with a file name")
+		}
 	}
 
+	dir = filepath.Clean(dir)
+
 	// If the directory doesn't exist, return an error.
 	if f, err := os.Stat(dir); err != nil {
 		if os.IsNotExist(err) {

file/create_test.go

@@ -15,9 +15,14 @@ func TestValidateCreateSuccess(t *testing.T) {
 	require.NoError(t, err)
 }
 
-func TestValidateCreateEmptyFilename(t *testing.T) {
+func TestValidateCreateEmptyPath(t *testing.T) {
 	err := ValidateCreate("")
-	require.EqualError(t, err, "File name cannot be empty")
+	require.EqualError(t, err, "File path is empty")
+}
+
+func TestValidateCreatePathEndingWithDirectory(t *testing.T) {
+	err := ValidateCreate("foobar/")
+	require.EqualError(t, err, "File path must end with a file name")
 }
 
 func TestValidateCreateDirectoryDoesNotExist(t *testing.T) {