How to use mock-fs - 10 common examples
To help you get started, we’ve selected a few mock-fs examples, based on popular ways it is used in public projects.
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Tatamo / atcoder-cli / tests / __tests__ / template.ts View on Github 
mock({
[DUMMY_CONFIG_DIRECTORY_PATH]: {
...templates2files(mock_templates),
// add directory without template.json
"non-template": {
"this-is-not-template.json": JSON.stringify({
task: {
submit: "main.cpp",
program: ["main.cpp"]
}
})
}
}
});
const result = await template.getTemplates();
mock.restore();
// there's no template "non-template"
expect(result).toMatchSnapshot();
});
test("files to be ignored", async () => {beforeEach(function() {
mockFs({
'/reports/locked.log': mockFs.file({
mode: parseInt('444', 8)
})
});
// Actually we have to replace gutil.log with a stub because its
// current implementation uses "require" at run-time which will
// fail after file system is mocked.
logStub = sinon.stub(gutil, 'log');
});it('should ignore files with extensions listed in excludeExtensions', () => {
let testDir = {
'dir1': {
'file-1.ts': mockfs.file({content: 'file-1.ts content', mtime: new Date(1000)}),
'file-1.cs': mockfs.file({content: 'file-1.cs content', mtime: new Date(1000)}),
'file-1d.cs': mockfs.file({content: 'file-1d.cs content', mtime: new Date(1000)}),
'file-1.d.cs': mockfs.file({content: 'file-1.d.cs content', mtime: new Date(1000)}),
'file-2.md': mockfs.file({content: 'file-2.md content', mtime: new Date(1000)}),
'file-3.ts': mockfs.file({content: 'file-3.ts content', mtime: new Date(1000)}),
'file-4.d.ts': mockfs.file({content: 'file-4.d.ts content', mtime: new Date(1000)}),
'subdir-1': {
'file-1.1.cc': mockfs.file({content: 'file-1.1.cc content', mtime: new Date(1000)})
}
}
};
mockfs(testDir);
let differ = new TreeDiffer('testLabel', 'dir1', ['.ts', '.cs'], ['.d.ts', '.d.cs']);
let diffResult = differ.diffTree();
expect(diffResult.addedPaths).toEqual(['file-1.cs', 'file-1.ts', 'file-1d.cs', 'file-3.ts']);
// change two files
testDir['dir1']['file-1.ts'] = mockfs.file({content: 'new content', mtime: new Date(1000)});it('should handle changes via symbolic links', () => {
let testDir = {
'orig_path': {
'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)}),
'file-2.txt': mockfs.file({content: 'file-2.txt content', mtime: new Date(1000)}),
'subdir-1': {
'file-1.1.txt': mockfs.file({content: 'file-1.1.txt content', mtime: new Date(1000)})
}
},
'symlinks': {
'file-1.txt': mockfs.symlink({path: '../orig_path/file-1.txt'}),
'file-2.txt': mockfs.symlink({path: '../orig_path/file-2.txt'}),
'subdir-1':
{'file-1.1.txt': mockfs.symlink({path: '../../orig_path/subdir-1/file-1.1.txt'})}
}
};
mockfs(testDir);
let differ = new TreeDiffer('testLabel', 'symlinks');
let diffResult = differ.diffTree();
expect(diffResult.addedPaths).toEqual([
'file-1.txt', 'file-2.txt', 'subdir-1' + path.sep + 'file-1.1.txt'
]);
// change two files
testDir['orig_path']['file-1.txt'] =it('should handle changes via symbolic links', () => {
let testDir = {
'orig_path': {
'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)}),
'file-2.txt': mockfs.file({content: 'file-2.txt content', mtime: new Date(1000)}),
'subdir-1': {
'file-1.1.txt': mockfs.file({content: 'file-1.1.txt content', mtime: new Date(1000)})
}
},
'symlinks': {
'file-1.txt': mockfs.symlink({path: '../orig_path/file-1.txt'}),
'file-2.txt': mockfs.symlink({path: '../orig_path/file-2.txt'}),
'subdir-1':
{'file-1.1.txt': mockfs.symlink({path: '../../orig_path/subdir-1/file-1.1.txt'})}
}
};
mockfs(testDir);
let differ = new TreeDiffer('testLabel', 'symlinks');
let diffResult = differ.diffTree();
expect(diffResult.addedPaths).toEqual([
'file-1.txt', 'file-2.txt', 'subdir-1' + path.sep + 'file-1.1.txt'
]);
// change two files
testDir['orig_path']['file-1.txt'] =
mockfs.file({content: 'new content', mtime: new Date(1000)});
testDir['orig_path']['subdir-1']['file-1.1.txt'] =it('should handle changes via symbolic links', () => {
let testDir = {
'orig_path': {
'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)}),
'file-2.txt': mockfs.file({content: 'file-2.txt content', mtime: new Date(1000)}),
'subdir-1': {
'file-1.1.txt': mockfs.file({content: 'file-1.1.txt content', mtime: new Date(1000)})
}
},
'symlinks': {
'file-1.txt': mockfs.symlink({path: '../orig_path/file-1.txt'}),
'file-2.txt': mockfs.symlink({path: '../orig_path/file-2.txt'}),
'subdir-1':
{'file-1.1.txt': mockfs.symlink({path: '../../orig_path/subdir-1/file-1.1.txt'})}
}
};
mockfs(testDir);
let differ = new TreeDiffer('testLabel', 'symlinks');
let diffResult = differ.diffTree();
expect(diffResult.addedPaths).toEqual([
'file-1.txt', 'file-2.txt', 'subdir-1' + path.sep + 'file-1.1.txt'
]);
// change two filesgrunt.registerTask('startMocking', function () {
mock({
'test/fake/': {
'file1.js': mock.file({
content: 'file content here',
ctime: new Date(1411609054470),
mtime: new Date(1411609054470) //Wed Sep 24 2014 18:37:34 GMT-0700 (PDT)
}),
'file2.js': mock.file({
content: 'file content here',
ctime: new Date(1369140245000),
mtime: new Date(1369140245000) //Tue May 21 2013 05:44:05 GMT-0700 (PDT)
}),
'file3.js': mock.file({
content: 'file content here',
ctime: new Date(1328091453000),
mtime: new Date(1328091453000) //Wed Feb 01 2012 02:17:33 GMT-0800 (PST)
}),
'file4.js': mock.file({
content: 'file content here',
ctime: new Date(1388563200000),
mtime: new Date(1388563200000) //Wed Jan 01 2014 00:00:00 GMT-0800 (PST)
})
}
});
// grunt is using glob that is using graceful-fs.
// It also needs to be mocked
_fileGlobSync = grunt.file.glob.sync;
grunt.file.glob.sync = function (pattern, options) {beforeEach(async function mockValidProjectLayout(done) {
mockFs({
'path/to/testsuites': {
'sakuli.properties': `
sakuli.environment.similarity.default=0.99
`,
'suite': {
'testsuite.properties': `testsuite.name=test`,
'testsuite.suite': stripIndent`
case1/sakuli_demo.js http://sahi.example.com/_s_/dyn/Driver_initialized
case2/sakuli_demo.js http://sahi.example.com/_s_/dyn/Driver_initialized
`,
case1: {
'sakuli_demo.js': '// Test'
},
case2: {
'sakuli_demo.js': '// Test'
}test('.babelrc is detected when present', t => {
t.is(parseOptions({}, {}).babelConfig, undefined);
const babelrc = mock.file({content: '{"presets": ["@babel/preset-env" ]}'});
mock({'.babelrc': babelrc});
t.is(parseOptions({}, {}).babelConfig, process.cwd() + '/.babelrc');
mock.restore();
});it("Picks first available file when given multiple extensions", () => {
cache.extensions = [".story", ".snap"];
fsMock({
"/abc/__snapshots__/tt.ts.story": fsMock.file({
mtime: new Date(2017, 10, 10, 10, 1, 1),
content: "story content"
}),
"/abc/__snapshots__/tt.ts.snap": fsMock.file({
mtime: new Date(2017, 10, 10, 10, 1, 1),
content: "some content"
})
});
(parseSnapshotFile as jest.Mock).mockReturnValue([
"this is definition, not important for test"
]);
const def = cache.getSnapshotForFile("/abc/tt.ts");
expect(def).toEqual({
file: "/abc/__snapshots__/tt.ts.story",
definitions: ["this is definition, not important for test"]mock-fs
A configurable mock file system. You know, for testing.
