Adding tests for createTmpDirectory

test/createTmpDirectory.test.js

@@ -0,0 +1,19 @@
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const createTmpDirectory = require('../src/utils/createTmpDirectory');
+
+jest.mock('fs');
+jest.mock('os');
+jest.mock('path');
+
+describe('Tests for createTmpDirectory', () => {
+  it('creates a tempyrary directory based on the os.tmpdir path', () => {
+    fs.mkdtempSync = jest.fn(dir => dir);
+    os.tmpdir = jest.fn(() => 'tmp-test');
+    path.sep = '/';
+    expect(createTmpDirectory()).toEqual('tmp-test/');
+    expect(fs.mkdtempSync).toHaveBeenCalledTimes(1);
+    expect(os.tmpdir).toHaveBeenCalledTimes(1);
+  });
+});