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index.test.js
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index.test.js
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jest.mock('find-parent-dir');
jest.mock('fs');
var importer = require('./');
var mockFs = require('fs');
var mockFindParentDir = require('find-parent-dir');
describe('Importer', function() {
beforeEach(function() {
mockFs.existsSync.mockClear();
mockFindParentDir.sync.mockReturnValue('MOCK_PARENT_DIR').mockClear();
});
test('resolves to node_modules directory when first character is ~', function() {
mockFs.existsSync.mockReturnValue(true);
expect(importer('~my-module', '')).toEqual({
file: __dirname + '/MOCK_PARENT_DIR/node_modules/my-module/index'
});
});
test('does nothing when the first character isnt a ~', function() {
expect(importer('my-module', '')).toEqual(null);
});
test('recursively resolve url until package has not been found', function() {
var mockFsCheck = mockFs.existsSync,
mockParentDirFinder = mockFindParentDir.sync;
// url can not be resolved up to 10 level
for (var i = 0; i < 10; i++) {
mockFsCheck = mockFsCheck
.mockReturnValueOnce(false) // directory import
.mockReturnValueOnce(false); // file import
mockParentDirFinder = mockParentDirFinder.mockReturnValueOnce('MOCK_PARENT_DIR' + i);
}
// url finally found
mockFsCheck = mockFsCheck.mockReturnValueOnce(false).mockReturnValueOnce(true);
mockParentDirFinder = mockParentDirFinder.mockReturnValueOnce('MOCK_PARENT_DIR_final');
expect(importer('~my-module/test', '')).toEqual({
file: __dirname + '/MOCK_PARENT_DIR_final/node_modules/my-module/test'
});
expect(mockParentDirFinder.mock.calls.length).toBe(11);
expect(mockFsCheck.mock.calls.length).toBe(22);
});
test('return null when package file can not be resolved', function() {
mockFindParentDir.sync.mockReturnValue(null);
expect(importer('~my-module', '')).toEqual({ file: null });
});
test('should resolve extensions', function() {
mockFs.existsSync.mockReturnValueOnce(true);
expect(importer('~my-module/test.scss', '')).toEqual({
file: __dirname + '/MOCK_PARENT_DIR/node_modules/my-module/test.scss'
});
});
test('should support file imports', function() {
mockFs.existsSync
.mockReturnValueOnce(false) // directory import
.mockReturnValueOnce(true); // file import
expect(importer('~my-module/test', '')).toEqual({
file: __dirname + '/MOCK_PARENT_DIR/node_modules/my-module/test'
});
});
test('should support directory imports', function() {
mockFs.existsSync.mockReturnValueOnce(true); // directory import
expect(importer('~my-module/test', '')).toEqual({
file: __dirname + '/MOCK_PARENT_DIR/node_modules/my-module/test/index'
});
});
});