Add tests

__tests__/setup-java.test.ts

@@ -1,3 +1,98 @@
-describe('TODO - Add a test suite', () => {
-  it('TODO - Add a test', async () => {});
+import io = require('@actions/io');
+import fs = require('fs');
+import path = require('path');
+import child_process = require('child_process');
+
+const toolDir = path.join(__dirname, 'runner', 'tools');
+const tempDir = path.join(__dirname, 'runner', 'temp');
+const javaDir = path.join(__dirname, 'runner', 'java');
+
+process.env['RUNNER_TOOLSDIRECTORY'] = toolDir;
+process.env['RUNNER_TEMPDIRECTORY'] = tempDir;
+import * as installer from '../src/installer';
+
+let javaFilePath = '';
+let javaUrl = '';
+if (process.platform === 'win32') {
+  javaFilePath = path.join(javaDir, 'java_win.zip');
+  javaUrl =
+    'https://download.java.net/java/GA/jdk12/33/GPL/openjdk-12_windows-x64_bin.zip';
+} else if (process.platform === 'darwin') {
+  javaFilePath = path.join(javaDir, 'java_mac.tar.gz');
+  javaUrl =
+    'https://download.java.net/java/GA/jdk12/33/GPL/openjdk-12_osx-x64_bin.tar.gz';
+} else {
+  javaFilePath = path.join(javaDir, 'java_linux.tar.gz');
+  javaUrl =
+    'https://download.java.net/java/GA/jdk12/33/GPL/openjdk-12_linux-x64_bin.tar.gz';
+}
+
+describe('installer tests', () => {
+  beforeAll(async () => {
+    await io.rmRF(toolDir);
+    await io.rmRF(tempDir);
+    if (!fs.existsSync(`${javaFilePath}.complete`)) {
+      // Download java
+      await io.mkdirP(javaDir);
+
+      console.log('Downloading java');
+      child_process.execSync(`curl "${javaUrl}" > "${javaFilePath}"`);
+      // Write complete file so we know it was successful
+      fs.writeFileSync(`${javaFilePath}.complete`, 'content');
+    }
+  }, 300000);
+
+  afterAll(async () => {
+    try {
+      await io.rmRF(toolDir);
+      await io.rmRF(tempDir);
+    } catch {
+      console.log('Failed to remove test directories');
+    }
+  }, 100000);
+
+  it('Acquires version of Java if no matching version is installed', async () => {
+    await installer.getJava('12', 'x64', javaFilePath);
+    const JavaDir = path.join(toolDir, 'Java', '12.0.0', 'x64');
+
+    expect(fs.existsSync(`${JavaDir}.complete`)).toBe(true);
+    expect(fs.existsSync(path.join(JavaDir, 'bin'))).toBe(true);
+  }, 100000);
+
+  it('Throws if invalid directory to jdk', async () => {
+    let thrown = false;
+    try {
+      await installer.getJava('1000', 'x64', 'bad path');
+    } catch {
+      thrown = true;
+    }
+    expect(thrown).toBe(true);
+  });
+
+  it('Uses version of Java installed in cache', async () => {
+    const JavaDir: string = path.join(toolDir, 'Java', '250.0.0', 'x64');
+    await io.mkdirP(JavaDir);
+    fs.writeFileSync(`${JavaDir}.complete`, 'hello');
+    // This will throw if it doesn't find it in the cache (because no such version exists)
+    await installer.getJava(
+      '250',
+      'x64',
+      'path shouldnt matter, found in cache'
+    );
+    return;
+  });
+
+  it('Doesnt use version of Java that was only partially installed in cache', async () => {
+    const JavaDir: string = path.join(toolDir, 'Java', '251.0.0', 'x64');
+    await io.mkdirP(JavaDir);
+    let thrown = false;
+    try {
+      // This will throw if it doesn't find it in the cache (because no such version exists)
+      await installer.getJava('251', 'x64', 'bad path');
+    } catch {
+      thrown = true;
+    }
+    expect(thrown).toBe(true);
+    return;
+  });
 });