Add tests for sourcemap support

packages/jest-runtime/src/__tests__/Runtime-sourceMaps-test.js

@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @emails oncall+jsinfra
+ */
+'use strict';
+
+let createRuntime;
+
+describe('Runtime', () => {
+  beforeEach(() => {
+    createRuntime = require('createRuntime');
+  });
+
+  describe('requireModule', () => {
+    it('installs source maps if available', () =>
+      createRuntime(__filename).then(runtime => {
+        let hasThrown = false;
+        const sum = runtime.requireModule(
+          runtime.__mockRootPath,
+          './sourcemaps/out/throwing-mapped-fn.js',
+        ).sum;
+
+        try {
+          sum();
+        } catch (err) {
+          hasThrown = true;
+          /* eslint-disable max-len */
+          if (process.platform === 'win32') {
+            expect(err.stack).toMatch(
+              /^Error: throwing fn\s+at sum.+\\__tests__\\test_root\\sourcemaps\\throwing-mapped-fn.js:10:9/,
+            );
+          } else {
+            expect(err.stack).toMatch(
+              /^Error: throwing fn\s+at sum.+\/__tests__\/test_root\/sourcemaps\/throwing-mapped-fn.js:10:9/,
+            );
+          }
+          /* eslint-enable max-len */
+        }
+        expect(hasThrown).toBe(true);
+      }));
+  });
+});

packages/jest-runtime/src/__tests__/test_root/sourcemaps/throwing-mapped-fn.js

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+export function sum() {
+  throw new Error('throwing fn');
+}