Get unityVersion from ProjectVersion.txt (#84)

action.yml

@@ -4,8 +4,8 @@ description: 'Run tests for any Unity project.'
 inputs:
   unityVersion:
     required: false
-    default: '2019.2.11f1'
+    default: 'auto'
-    description: 'Version of unity to use for testing the project.'
+    description: 'Version of unity to use for testing the project. Use "auto" to get from your ProjectSettings/ProjectVersion.txt'
   customImage:
     required: false
     default: ''

src/model/image-tag.test.js

@@ -1,6 +1,6 @@
 import ImageTag from './image-tag';
 
-describe('UnityImageVersion', () => {
+describe('ImageTag', () => {
   describe('constructor', () => {
     const some = {
       name: 'someName',

src/model/input.js

@@ -1,5 +1,6 @@
 import { getInput } from '@actions/core';
 import { includes } from 'lodash-es';
+import UnityVersionParser from './unity-version-parser';
 
 class Input {
   static get testModes() {
@@ -14,7 +15,7 @@ class Input {
 
   static getFromUser() {
     // Input variables specified in workflow using "with" prop.
-    const unityVersion = getInput('unityVersion') || '2019.2.11f1';
+    const rawUnityVersion = getInput('unityVersion') || 'auto';
     const customImage = getInput('customImage') || '';
     const testMode = getInput('testMode') || 'all';
     const rawProjectPath = getInput('projectPath') || '.';
@@ -43,6 +44,8 @@ class Input {
     const projectPath = rawProjectPath.replace(/\/$/, '');
     const artifactsPath = rawArtifactsPath.replace(/\/$/, '');
     const useHostNetwork = rawUseHostNetwork === 'true';
+    const unityVersion =
+      rawUnityVersion === 'auto' ? UnityVersionParser.read(projectPath) : rawUnityVersion;
 
     // Return sanitised input
     return {

src/model/unity-version-parser.js

@@ -0,0 +1,26 @@
+import fs from 'fs';
+import path from 'path';
+
+class UnityVersionParser {
+  static get versionPattern() {
+    return /20\d{2}\.\d\.\w{3,4}|3/;
+  }
+
+  static parse(projectVersionTxt) {
+    const matches = projectVersionTxt.match(UnityVersionParser.versionPattern);
+    if (!matches || matches.length === 0) {
+      throw new Error(`Failed to parse version from "${projectVersionTxt}".`);
+    }
+    return matches[0];
+  }
+
+  static read(projectPath) {
+    const filePath = path.join(projectPath, 'ProjectSettings', 'ProjectVersion.txt');
+    if (!fs.existsSync(filePath)) {
+      return 'auto';
+    }
+    return UnityVersionParser.parse(fs.readFileSync(filePath, 'utf8'));
+  }
+}
+
+export default UnityVersionParser;

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

@@ -0,0 +1,25 @@
+import UnityVersionParser from './unity-version-parser';
+
+describe('UnityVersionParser', () => {
+  describe('parse', () => {
+    it('throws for empty string', () => {
+      expect(() => UnityVersionParser.parse('')).toThrow(Error);
+    });
+
+    it('parses from ProjectVersion.txt', () => {
+      const projectVersionContents = `m_EditorVersion: 2019.2.11f1
+      m_EditorVersionWithRevision: 2019.2.11f1 (5f859a4cfee5)`;
+      expect(UnityVersionParser.parse(projectVersionContents)).toBe('2019.2.11f1');
+    });
+  });
+
+  describe('read', () => {
+    it('does not throw', () => {
+      expect(() => UnityVersionParser.read('')).not.toThrow();
+    });
+
+    it('reads from unity-project-with-correct-tests', () => {
+      expect(UnityVersionParser.read('./unity-project-with-correct-tests')).toBe('2019.2.11f1');
+    });
+  });
+});