Configure jest and add a test case

jest.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+    testEnvironment: 'node',
+    moduleDirectories: ['node_modules'],
+    moduleFileExtensions: ['ts', 'js'],
+    transform: {
+        '.ts': '<rootDir>/jest.preprocessor.js',
+    },
+    transformIgnorePatterns: ['node_modules'],
+    testMatch: ['<rootDir>/test/**/*Tests.ts'],
+};

jest.preprocessor.js

@@ -0,0 +1,11 @@
+const tsc = require('typescript');
+const tsConfig = require('./tsconfig.json');
+
+module.exports = {
+    process(src, path) {
+        if (path.endsWith('.ts')) {
+            return tsc.transpile(src, tsConfig.compilerOptions, path, []);
+        }
+        return src;
+    },
+};

package.json

@@ -5,17 +5,19 @@
     "main": "lib/index.js",
     "scripts": {
         "build": "tsc",
-        "test": "echo \"Error: no test specified\" && exit 1"
+        "test": "jest"
     },
     "author": "Scott Mikula <[email protected]>",
     "license": "MIT",
     "dependencies": {
+        "@types/jest": "^21.1.2",
         "fs": "^0.0.1-security",
         "glob": "^7.1.2",
+        "jest": "^21.2.1",
         "minimatch": "^3.0.4",
         "typescript": "~2.4.0"
     },
     "devDependencies": {
         "@types/node": "^7.0.4"
     }
-}
+}

test/fileMatchesTagTests.ts

@@ -0,0 +1,7 @@
+import fileMatchesTag from '../src/fileMatchesTag';
+
+describe('fileMatchesTag', () => {
+    it('matches anything to *', () => {
+        expect(fileMatchesTag(null, '*')).toBe(true);
+    });
+});