✅ Add tests for utils

src/commands/play.comands.ts

@@ -29,7 +29,7 @@ import {
 } from '../models/jellyfinAudioItems';
 import { PlaybackService } from '../playback/playback.service';
 import { RemoteImageResult } from '@jellyfin/sdk/lib/generated-client/models';
-import { chooseSuitableRemoteImage } from '../utils/remoteImages';
+import { chooseSuitableRemoteImage } from '../utils/remoteImages/remoteImages';
 import { trimStringToFixedLength } from '../utils/stringUtils';
 
 @Command({

src/commands/playlist.command.ts

@@ -6,7 +6,7 @@ import { DiscordMessageService } from '../clients/discord/discord.message.servic
 import { GenericCustomReply } from '../models/generic-try-handler';
 import { PlaybackService } from '../playback/playback.service';
 import { Constants } from '../utils/constants';
-import { chooseSuitableRemoteImageFromTrack } from '../utils/remoteImages';
+import { chooseSuitableRemoteImageFromTrack } from '../utils/remoteImages/remoteImages';
 import { trimStringToFixedLength } from '../utils/stringUtils';
 import { formatMillisecondsAsHumanReadable } from '../utils/timeUtils';
 

src/health/health.controller.spec.ts

@@ -5,7 +5,7 @@ import {
 } from '@nestjs/terminus';
 import { HealthCheckExecutor } from '@nestjs/terminus/dist/health-check/health-check-executor.service';
 import { Test } from '@nestjs/testing';
-import { useDefaultMockerToken } from '../utils/tests';
+import { useDefaultMockerToken } from '../utils/tests/defaultMockerToken';
 import { HealthController } from './health.controller';
 import { DiscordHealthIndicator } from './indicators/discord.indicator';
 import { JellyfinHealthIndicator } from './indicators/jellyfin.indicator';

src/health/indicators/jeyllfin.indicator.spec.ts

@@ -1,7 +1,7 @@
 import { HealthIndicatorResult } from '@nestjs/terminus';
 import { Test } from '@nestjs/testing';
 import { JellyfinService } from '../../clients/jellyfin/jellyfin.service';
-import { useDefaultMockerToken } from '../../utils/tests';
+import { useDefaultMockerToken } from '../../utils/tests/defaultMockerToken';
 import { JellyfinHealthIndicator } from './jellyfin.indicator';
 
 describe('JellyfinHealthIndicator', () => {

src/updates/updates.service.spec.ts

@@ -3,7 +3,7 @@ import axios from 'axios';
 import { Client, GuildMember } from 'discord.js';
 import { DiscordMessageService } from '../clients/discord/discord.message.service';
 import { GithubRelease } from '../models/github-release';
-import { useDefaultMockerToken } from '../utils/tests';
+import { useDefaultMockerToken } from '../utils/tests/defaultMockerToken';
 import { UpdatesService } from './updates.service';
 
 // mock axios: https://stackoverflow.com/questions/51275434/type-of-axios-mock-using-jest-typescript/55351900#55351900

src/utils/remoteImages/remoteImages.spec.ts

@@ -0,0 +1,29 @@
+import { ImageType } from '@jellyfin/sdk/lib/generated-client/models';
+import { chooseSuitableRemoteImageFromTrack } from './remoteImages';
+
+describe('remoteImages', () => {
+  it('chooseSuitableRemoteImageFromTrack', () => {
+    const remoteImage = chooseSuitableRemoteImageFromTrack({
+      name: 'Testing Music',
+      durationInMilliseconds: 6969,
+      jellyfinId: '7384783',
+      remoteImages: {
+        Images: [
+          {
+            Type: ImageType.Primary,
+            Url: 'nice picture.png',
+          },
+          {
+            Type: ImageType.Screenshot,
+            Url: 'not nice picture',
+          },
+        ],
+      },
+      streamUrl: 'http://jellyfin/example-stream',
+    });
+
+    expect(remoteImage).not.toBeNull();
+    expect(remoteImage.Type).toBe(ImageType.Primary);
+    expect(remoteImage.Url).toBe('nice picture.png');
+  });
+});

src/utils/remoteImages/remoteImages.ts

@@ -3,7 +3,7 @@ import {
   RemoteImageInfo,
   RemoteImageResult,
 } from '@jellyfin/sdk/lib/generated-client/models';
-import { Track } from '../types/track';
+import { Track } from '../../types/track';
 
 export const chooseSuitableRemoteImage = (
   remoteImageResult: RemoteImageResult,

src/utils/stringUtils/stringUtils.spec.ts

@@ -0,0 +1,23 @@
+import { trimStringToFixedLength } from './stringUtils';
+
+describe('stringUtils', () => {
+  it('trimStringToFixedLengthShouldNotTrim', () => {
+    const trimmedString = trimStringToFixedLength('test', 20);
+
+    expect(trimmedString).toBe('test');
+  });
+
+  it('trimStringToFixedLengthShouldThrowError', () => {
+    const action = () => {
+      trimStringToFixedLength('testing value', 0);
+    };
+
+    expect(action).toThrow(Error);
+  });
+
+  it('trimStringToFixedLengthShouldTrimWhenLengthExceeded', () => {
+    const trimmedString = trimStringToFixedLength('hello world', 5);
+
+    expect(trimmedString).toBe('he...');
+  });
+});

src/utils/stringUtils/stringUtils.ts

@@ -3,7 +3,11 @@ export const trimStringToFixedLength = (value: string, maxLength: number) => {
     throw new Error('max length must be positive');
   }
 
-  return value.length > maxLength
-    ? value.substring(0, maxLength - 3) + '...'
-    : value;
+  if (value.length <= maxLength) {
+    return value;
+  }
+
+  const upperBound = maxLength - 3;
+
+  return value.substring(0, upperBound) + '...';
 };

src/utils/tests/defaultMockerToken.spec.ts

@@ -0,0 +1,17 @@
+import { useDefaultMockerToken } from './defaultMockerToken';
+
+describe('defaultMockerToken', () => {
+  it('useDefaultMockerTokenShouldbeNull', () => {
+    const mockerToken = useDefaultMockerToken('test');
+
+    expect(mockerToken).toBeNull();
+  });
+
+  it('useDefaultMockerTokenShouldReturnNull', () => {
+    const mockerToken = useDefaultMockerToken(() => ({
+      test: () => jest.fn(),
+    }));
+
+    expect(mockerToken).not.toBeNull();
+  });
+});