Added L0 tests and fixed some minor issues.

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: "build-test"
+on: # rebuild any PRs and main branch changes
+  pull_request:
+    branches:
+      - master
+      - 'releases/*'
+  push:
+    branches:
+      - master
+      - 'releases/*'
+
+jobs:
+  build: # make sure build/ci works properly
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - run: |
+        npm install
+        npm build
+        npm test

.gitignore

@@ -59,3 +59,6 @@ typings/
 
 # next.js build output
 .next
+
+node_modules
+coverage

__tests__/run.test.ts

@@ -0,0 +1,195 @@
+import * as run from '../src/run'
+import * as os from 'os';
+import * as toolCache from '@actions/tool-cache';
+import * as fs from 'fs';
+import * as path from 'path';
+import * as core from '@actions/core';
+
+describe('run.ts', () => {
+    test('getExecutableExtension() - return .exe when os is Windows', () => {
+        jest.spyOn(os, 'type').mockReturnValue('Windows_NT');
+
+        expect(run.getExecutableExtension()).toBe('.exe');
+        expect(os.type).toBeCalled();         
+    });
+
+    test('getExecutableExtension() - return empty string for non-windows OS', () => {
+        jest.spyOn(os, 'type').mockReturnValue('Darwin');
+
+        expect(run.getExecutableExtension()).toBe('');         
+        expect(os.type).toBeCalled();         
+    });
+
+    test('getHelmDownloadURL() - return the URL to download helm for Linux', () => {
+        jest.spyOn(os, 'type').mockReturnValue('Linux');
+        const kubectlLinuxUrl = 'https://get.helm.sh/helm-v3.2.1-linux-amd64.zip'
+
+        expect(run.getHelmDownloadURL('v3.2.1')).toBe(kubectlLinuxUrl);
+        expect(os.type).toBeCalled();         
+    });
+
+    test('getHelmDownloadURL() - return the URL to download helm for Darwin', () => {
+        jest.spyOn(os, 'type').mockReturnValue('Darwin');
+        const kubectlDarwinUrl = 'https://get.helm.sh/helm-v3.2.1-darwin-amd64.zip'
+
+        expect(run.getHelmDownloadURL('v3.2.1')).toBe(kubectlDarwinUrl);
+        expect(os.type).toBeCalled();         
+    });
+
+    test('getHelmDownloadURL() - return the URL to download helm for Windows', () => {
+        jest.spyOn(os, 'type').mockReturnValue('Windows_NT');
+
+        const kubectlWindowsUrl = 'https://get.helm.sh/helm-v3.2.1-windows-amd64.zip'
+        expect(run.getHelmDownloadURL('v3.2.1')).toBe(kubectlWindowsUrl);
+        expect(os.type).toBeCalled();         
+    });
+
+    test('getStableHelmVersion() - download stable version file, read version and return it', async () => {
+        jest.spyOn(toolCache, 'downloadTool').mockResolvedValue('pathToTool');
+        const response = JSON.stringify(
+            [
+                {
+                    'tag_name': 'v4.0.0'
+                }, {
+                    'tag_name': 'v3.0.0'
+                }, {
+                    'tag_name': 'v2.0.0'
+                }
+            ]
+        );
+        jest.spyOn(fs, 'readFileSync').mockReturnValue(response);
+
+        expect(await run.getStableHelmVersion()).toBe('v4.0.0');
+        expect(toolCache.downloadTool).toBeCalled();
+        expect(fs.readFileSync).toBeCalledWith('pathToTool', 'utf8');
+    });
+
+    test('getStableHelmVersion() - return default version if error occurs while getting latest version', async () => {
+        jest.spyOn(toolCache, 'downloadTool').mockRejectedValue('Unable to download');
+        jest.spyOn(core, 'warning').mockImplementation();
+
+        expect(await run.getStableHelmVersion()).toBe('v3.2.1');
+        expect(toolCache.downloadTool).toBeCalled();
+        expect(core.warning).toBeCalledWith("Cannot get the latest Helm info from https://api.github.com/repos/helm/helm/releases. Error Unable to download. Using default Helm version v3.2.1.");
+    });
+
+    test('walkSync() - return path to the all files matching fileToFind in dir', () => {
+        jest.spyOn(fs, 'readdirSync').mockImplementation((file, _) => {
+            if (file == 'mainFolder') return ['file1' as unknown as fs.Dirent, 'file2' as unknown as fs.Dirent, 'folder1' as unknown as fs.Dirent, 'folder2' as unknown as fs.Dirent];
+            if (file == path.join('mainFolder', 'folder1')) return ['file11' as unknown as fs.Dirent, 'file12' as unknown as fs.Dirent];
+            if (file == path.join('mainFolder', 'folder2')) return ['file21' as unknown as fs.Dirent, 'file22' as unknown as fs.Dirent];
+        });
+        jest.spyOn(core, 'debug').mockImplementation();
+        jest.spyOn(fs, 'statSync').mockImplementation((file) => {
+            const isDirectory = (file as string).toLowerCase().indexOf('file') == -1 ? true: false
+            return { isDirectory: () => isDirectory } as fs.Stats;
+        });
+
+        expect(run.walkSync('mainFolder', null, 'file21')).toEqual([path.join('mainFolder', 'folder2', 'file21')]);
+        expect(fs.readdirSync).toBeCalledTimes(3);
+        expect(fs.statSync).toBeCalledTimes(8);
+    });
+
+    test('walkSync() - return empty array if no file with name fileToFind exists', () => {
+        jest.spyOn(fs, 'readdirSync').mockImplementation((file, _) => {
+            if (file == 'mainFolder') return ['file1' as unknown as fs.Dirent, 'file2' as unknown as fs.Dirent, 'folder1' as unknown as fs.Dirent, 'folder2' as unknown as fs.Dirent];
+            if (file == path.join('mainFolder', 'folder1')) return ['file11' as unknown as fs.Dirent, 'file12' as unknown as fs.Dirent];
+            if (file == path.join('mainFolder', 'folder2')) return ['file21' as unknown as fs.Dirent, 'file22' as unknown as fs.Dirent];
+        });
+        jest.spyOn(core, 'debug').mockImplementation();
+        jest.spyOn(fs, 'statSync').mockImplementation((file) => {
+            const isDirectory = (file as string).toLowerCase().indexOf('file') == -1 ? true: false
+            return { isDirectory: () => isDirectory } as fs.Stats;
+        });
+
+        expect(run.walkSync('mainFolder', null, 'helm.exe')).toEqual([]);
+        expect(fs.readdirSync).toBeCalledTimes(3);
+        expect(fs.statSync).toBeCalledTimes(8);
+    });
+
+    test('findHelm() - change access permissions and find the helm in given directory', () => {
+        jest.spyOn(fs, 'chmodSync').mockImplementation(() => {});
+        jest.spyOn(fs, 'readdirSync').mockImplementation((file, _) => {
+            if (file == 'mainFolder') return ['helm.exe' as unknown as fs.Dirent];
+        });
+        jest.spyOn(fs, 'statSync').mockImplementation((file) => {
+            const isDirectory = (file as string).indexOf('folder') == -1 ? false: true
+            return { isDirectory: () => isDirectory } as fs.Stats;
+        });
+        jest.spyOn(os, 'type').mockReturnValue('Windows_NT');
+
+        expect(run.findHelm('mainFolder')).toBe(path.join('mainFolder', 'helm.exe'));
+    });
+
+    test('findHelm() - throw error if executable not found', () => {
+        jest.spyOn(fs, 'chmodSync').mockImplementation(() => {});
+        jest.spyOn(fs, 'readdirSync').mockImplementation((file, _) => {
+            if (file == 'mainFolder') return [];
+        });
+        jest.spyOn(fs, 'statSync').mockImplementation((file) => { return { isDirectory: () => true } as fs.Stats});
+        jest.spyOn(os, 'type').mockReturnValue('Windows_NT');
+        expect(() => run.findHelm('mainFolder')).toThrow('Helm executable not found in path mainFolder');
+    });
+
+    test('downloadHelm() - download helm and return path to it', async () => {
+        jest.spyOn(toolCache, 'find').mockReturnValue('');
+        jest.spyOn(toolCache, 'downloadTool').mockResolvedValue('pathToTool');
+        const response = JSON.stringify([{'tag_name': 'v4.0.0'}]);
+        jest.spyOn(fs, 'readFileSync').mockReturnValue(response);
+        jest.spyOn(os, 'type').mockReturnValue('Windows_NT');
+        jest.spyOn(fs, 'chmodSync').mockImplementation(() => {});
+        jest.spyOn(toolCache, 'extractZip').mockResolvedValue('pathToUnzippedHelm');
+        jest.spyOn(toolCache, 'cacheDir').mockResolvedValue('pathToCachedDir');
+        jest.spyOn(fs, 'readdirSync').mockImplementation((file, _) => ['helm.exe' as unknown as fs.Dirent]);
+        jest.spyOn(fs, 'statSync').mockImplementation((file) => {
+            const isDirectory = (file as string).indexOf('folder') == -1 ? false: true
+            return { isDirectory: () =>  isDirectory } as fs.Stats;
+        });
+
+        expect(await run.downloadHelm(null)).toBe(path.join('pathToCachedDir', 'helm.exe'));
+        expect(toolCache.find).toBeCalledWith('helm', 'v4.0.0');
+        expect(toolCache.downloadTool).toBeCalledWith('https://get.helm.sh/helm-v4.0.0-windows-amd64.zip');
+        expect(fs.chmodSync).toBeCalledWith('pathToTool', '777');
+        expect(toolCache.extractZip).toBeCalledWith('pathToTool');
+        expect(fs.chmodSync).toBeCalledWith(path.join('pathToCachedDir', 'helm.exe'), '777');
+    });
+
+    test('downloadHelm() - throw error if unable to download', async () => {
+        jest.spyOn(toolCache, 'find').mockReturnValue('');
+        jest.spyOn(toolCache, 'downloadTool').mockImplementation(async () => { throw 'Unable to download'});
+        jest.spyOn(os, 'type').mockReturnValue('Windows_NT');
+
+        await expect(run.downloadHelm('v3.2.1')).rejects.toThrow('Failed to download Helm from location https://get.helm.sh/helm-v3.2.1-windows-amd64.zip');
+        expect(toolCache.find).toBeCalledWith('helm', 'v3.2.1');
+        expect(toolCache.downloadTool).toBeCalledWith('https://get.helm.sh/helm-v3.2.1-windows-amd64.zip');
+    });
+
+    test('downloadHelm() - return path to helm tool with same version from toolCache', async () => {
+        jest.spyOn(toolCache, 'find').mockReturnValue('pathToCachedDir');
+        jest.spyOn(fs, 'chmodSync').mockImplementation(() => {});
+
+        expect(await run.downloadHelm('v3.2.1')).toBe(path.join('pathToCachedDir', 'helm.exe'));
+        expect(toolCache.find).toBeCalledWith('helm', 'v3.2.1');
+        expect(fs.chmodSync).toBeCalledWith(path.join('pathToCachedDir', 'helm.exe'), '777');
+    });
+
+    test('downloadHelm() - throw error is helm is not found in path', async () => {
+        jest.spyOn(toolCache, 'find').mockReturnValue('');
+        jest.spyOn(toolCache, 'downloadTool').mockResolvedValue('pathToTool');
+        jest.spyOn(os, 'type').mockReturnValue('Windows_NT');
+        jest.spyOn(fs, 'chmodSync').mockImplementation();
+        jest.spyOn(toolCache, 'extractZip').mockResolvedValue('pathToUnzippedHelm');
+        jest.spyOn(toolCache, 'cacheDir').mockResolvedValue('pathToCachedDir');
+        jest.spyOn(fs, 'readdirSync').mockImplementation((file, _) => []);
+        jest.spyOn(fs, 'statSync').mockImplementation((file) => {
+            const isDirectory = (file as string).indexOf('folder') == -1 ? false: true
+            return { isDirectory: () =>  isDirectory } as fs.Stats;
+        });
+
+        await expect(run.downloadHelm('v3.2.1')).rejects.toThrow('Helm executable not found in path pathToCachedDir');
+        expect(toolCache.find).toBeCalledWith('helm', 'v3.2.1');
+        expect(toolCache.downloadTool).toBeCalledWith('https://get.helm.sh/helm-v3.2.1-windows-amd64.zip');
+        expect(fs.chmodSync).toBeCalledWith('pathToTool', '777');
+        expect(toolCache.extractZip).toBeCalledWith('pathToTool');
+    });
+});  

jest.config.js

@@ -0,0 +1,18 @@
+module.exports = {
+  clearMocks: true,
+  moduleFileExtensions: ['js', 'ts'],
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.ts$': 'ts-jest'
+  },
+  verbose: true,
+  coverageThreshold: {
+    "global": {
+      "branches": 0,
+      "functions": 14,
+      "lines": 27,
+      "statements": 27
+    }
+  }
+}