Add integration test

integration_tests/__tests__/transform-linked-modules.test.js

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+// @flow
+
+'use strict';
+
+const runJest = require('../runJest');
+
+it('should transform linked modules', () => {
+  const result = runJest.json('transform-linked-modules', ['--no-cache']).json;
+
+  expect(result.success).toBe(true);
+  expect(result.numTotalTests).toBe(2);
+});

integration_tests/transform-linked-modules/__tests__/linked-modules.test.js

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+test('normal file', () => {
+  const normal = require('../ignored/normal');
+  expect(normal).toEqual('ignored/normal');
+});
+
+test('symlink', () => {
+  const symlink = require('../ignored/symlink');
+  expect(symlink).toEqual('transformed');
+});

integration_tests/transform-linked-modules/ignored/normal.js

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+module.exports = 'ignored/normal';

integration_tests/transform-linked-modules/ignored/symlink.js

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+../package/index.js

integration_tests/transform-linked-modules/package.json

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+{
+  "jest": {
+    "testEnvironment": "node",
+    "transformIgnorePatterns": [
+      "/node_modules/",
+      "<rootDir>/__tests__",
+      "<rootDir>/ignored/"
+    ],
+    "transform": {
+      "^.+\\.js$": "<rootDir>/preprocessor.js"
+    }
+  }
+}

integration_tests/transform-linked-modules/package/index.js

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+module.exports = 'package/index';

integration_tests/transform-linked-modules/preprocessor.js

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+module.exports = {
+  process() {
+    return 'module.exports = "transformed"';
+  },
+};