function verifyProjectFiles (tmpDir, projectName) {
    expect(fs.existsSync(path.join(tmpDir, 'App'))).toBe(true);
    expect(fs.existsSync(path.join(tmpDir, 'App.xcodeproj'))).toBe(true);
    expect(fs.existsSync(path.join(tmpDir, 'App.xcworkspace'))).toBe(true);
}
Verifies that some of the project file exists. Not all will be tested.
E.g. App's resource directory, xcodeproj, xcworkspace, and CordovaLib.

@param {String} tmpDir
@param {String} projectName