add images directory test

src/logic.js

@@ -7,6 +7,8 @@ const page_url = (page_id) => `https://www.facebook.com/${page_id}`;
 const page_events_url = (page_id) => page_url(page_id) + '/events/';
 
 const fs = require('fs').promises;
+const filesystem = require('fs');
+
 const gm = require('gm').subClass({ imageMagick: true });
 
 const parse_output = (argv) => {
@@ -122,8 +124,17 @@ const get_city_name = (event) =>
 const get_event_host = (event) =>
   pathOr('', 'event_place.contextual_name'.split('.'), event);
 
-const create_images_directory = (images_directory) =>
-  fs.mkdir(images_directory, { recursive: true }).catch(console.error);
+const create_images_directory = (images_directory) => {
+  if (images_directory === null || images_directory === undefined) {
+    return Promise.reject('Image path was not set');
+  }
+
+  if (!filesystem.existsSync(images_directory)) {
+    return fs.mkdir(images_directory, { recursive: true }).catch(console.error);
+  }
+
+  return Promise.resolve();
+};
 
 const read_previous_events = (path) => {
   if (path !== null) {

src/scrape.js

@@ -2,7 +2,6 @@ const puppeteer = require('puppeteer');
 const { pathOr, maxBy } = require('ramda');
 const path = require('path');
 const fs = require('fs').promises;
-const filesystem = require('fs');
 
 const { graphql_endpoint } = require('./constants');
 const { parse_args, create_images_directory } = require('./logic');

tests/create_images_directory.test.js

@@ -1,5 +1,50 @@
 import { create_images_directory } from '../src/logic';
 
+beforeEach(jest.restoreAllMocks);
+
+const fs = require('fs').promises;
+const filesystem = require('fs');
+
 describe('create_images_directory', () => {
-  it('', () => {});
+  it('creates images directory', () => {
+    const mock = jest
+      .spyOn(fs, 'mkdir')
+      .mockImplementation(() => Promise.resolve());
+    jest.spyOn(filesystem, 'existsSync').mockImplementation(() => false);
+    const dir = 'new directory';
+    expect.assertions(2);
+    return create_images_directory(dir).then(() => {
+      expect(mock).toHaveBeenCalledTimes(1);
+      expect(mock).toHaveBeenCalledWith(dir, { recursive: true });
+    });
+  });
+
+  it('it skips creating images directory', () => {
+    const fs_mock = jest
+      .spyOn(fs, 'mkdir')
+      .mockImplementation(() => Promise.resolve());
+    const exist_mock = jest
+      .spyOn(filesystem, 'existsSync')
+      .mockImplementation(() => true);
+    const dir = 'new directory';
+    expect.assertions(3);
+    return create_images_directory(dir).then(() => {
+      expect(fs_mock).toHaveBeenCalledTimes(0);
+      expect(exist_mock).toHaveBeenCalledTimes(1);
+      expect(exist_mock).toHaveBeenCalledWith(dir);
+    });
+  });
+
+  [undefined, null].forEach((dir) =>
+    it('throws if directory is not set', () => {
+      const mock = jest
+        .spyOn(filesystem, 'existsSync')
+        .mockImplementation(() => true);
+      expect.assertions(2);
+      return create_images_directory(dir).catch((error) => {
+        expect(mock).toHaveBeenCalledTimes(0);
+        expect(error).toEqual('Image path was not set');
+      });
+    }),
+  );
 });