Added some tests for babel-jest

integration-tests/snapshot-escape/__tests__/__snapshots__/snapshot_escape_substitution.test.js.snap

@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`escape substitution 1`] = `"\${banana}"`;

packages/babel-jest/src/__tests__/index.js

@@ -0,0 +1,74 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+const babelJest = require('../index');
+
+//Mock canCompile to always return true
+const babelCore = require('babel-core');
+babelCore.util = {
+  canCompile: () => true,
+};
+
+//Mock data for all the tests
+const sourceString = `
+const sum = (a, b) => a+b;
+const difference = (a, b) => a-b;
+
+const customMultiply = (obj, mul) => {
+    const {a, ...rest} = obj;
+    return a * mul;
+}
+
+customMultiply({a: 32, dummy: "test"}, 2);
+`;
+
+const mockConfig = {
+  moduleFileExtensions: [],
+};
+
+test(`Returns source string with inline maps when no transformOptions is passed`, () => {
+  const result = babelJest.process(sourceString, 'dummy_path.js', mockConfig);
+  expect(typeof result).toBe('string');
+  expect(result).toMatch('//# sourceMappingURL');
+  expect(result).toMatch('customMultiply');
+});
+
+test(`Returns source string with inline maps when transformOptions
+ is passed but doesn't have returnSourceString passed`, () => {
+  const result = babelJest.process(
+    sourceString,
+    'dummy_path.js',
+    mockConfig,
+    {},
+  );
+  expect(typeof result).toBe('string');
+  expect(result).toMatch('//# sourceMappingURL');
+  expect(result).toMatch('customMultiply');
+});
+
+test(`Returns source string with inline maps when transformOptions
+ is passed and returnSourceString is true`, () => {
+  const result = babelJest.process(sourceString, 'dummy_path.js', mockConfig, {
+    returnSourceString: true,
+  });
+  expect(typeof result).toBe('string');
+  expect(result).toMatch('//# sourceMappingURL');
+  expect(result).toMatch('customMultiply');
+});
+
+test(`Returns source string with inline maps when transformOptions
+ is passed and returnSourceString is false`, () => {
+  const result = babelJest.process(sourceString, 'dummy_path.js', mockConfig, {
+    returnSourceString: false,
+  });
+  expect(typeof result).toBe('object');
+  expect(result.code).toBeDefined();
+  expect(result.map).toBeDefined();
+  expect(result.code).toMatch('//# sourceMappingURL');
+  expect(result.code).toMatch('customMultiply');
+  expect(result.map.sources).toEqual(['dummy_path.js']);
+  expect(JSON.stringify(result.map.sourcesContent)).toMatch('customMultiply');
+});