Improve error message (#132)

src/model/input.test.js

@@ -1,5 +1,7 @@
 import Input from './input';
 
+jest.mock('./unity-version-parser');
+
 describe('Input', () => {
   describe('getFromUser', () => {
     it('does not throw', () => {

src/model/unity-version-parser.js

@@ -17,7 +17,9 @@ class UnityVersionParser {
   static read(projectPath) {
     const filePath = path.join(projectPath, 'ProjectSettings', 'ProjectVersion.txt');
     if (!fs.existsSync(filePath)) {
-      return 'auto';
+      throw new Error(
+        `Project settings file not found at "${filePath}". Have you correctly set the projectPath?`,
+      );
     }
     return UnityVersionParser.parse(fs.readFileSync(filePath, 'utf8'));
   }

src/model/unity-version-parser.test.js

@@ -14,8 +14,8 @@ describe('UnityVersionParser', () => {
   });
 
   describe('read', () => {
-    it('does not throw', () => {
+    it('throws for invalid path', () => {
-      expect(() => UnityVersionParser.read('')).not.toThrow();
+      expect(() => UnityVersionParser.read('')).toThrow(Error);
     });
 
     it('reads from unity-project-with-correct-tests', () => {