Add client tests

tests/client/client.test.ts

@@ -0,0 +1,135 @@
+import { CoreClient } from "../../src/client/client";
+
+import { Client } from "discord.js";
+import * as dotenv from "dotenv";
+import { Events } from "../../src/client/events";
+import { Util } from "../../src/client/util";
+
+jest.mock("discord.js");
+jest.mock("dotenv");
+jest.mock("../../src/client/events");
+jest.mock("../../src/client/util");
+
+test('Constructor_ExpectSuccessfulInitialisation', () => {
+    const coreClient = new CoreClient();
+
+    expect(coreClient).toBeInstanceOf(Client);
+    expect(dotenv.config).toBeCalledTimes(1);
+    expect(Events).toBeCalledTimes(1);
+    expect(Util).toBeCalledTimes(1);
+});
+
+test('Start_GivenEnvIsValid_ExpectSuccessfulStart', () => {
+    process.env = {
+        BOT_TOKEN: 'TOKEN',
+        BOT_PREFIX: '!',
+        FOLDERS_COMMANDS: 'commands',
+        FOLDERS_EVENTS: 'events',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).not.toThrow();
+    expect(coreClient.on).toBeCalledWith("message", expect.any(Function));
+    expect(coreClient.on).toBeCalledWith("ready", expect.any(Function));
+});
+
+test('Start_GivenBotTokenIsNull_ExpectFailure', () => {
+    process.env = {
+        BOT_PREFIX: '!',
+        FOLDERS_COMMANDS: 'commands',
+        FOLDERS_EVENTS: 'events',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("BOT_TOKEN is not defined in .env");
+});
+
+test('Start_GivenBotTokenIsEmpty_ExpectFailure', () => {
+    process.env = {
+        BOT_TOKEN: '',
+        BOT_PREFIX: '!',
+        FOLDERS_COMMANDS: 'commands',
+        FOLDERS_EVENTS: 'events',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("BOT_TOKEN is not defined in .env");
+});
+
+test('Start_GivenBotPrefixIsNull_ExpectFailure', () => {
+    process.env = {
+        BOT_TOKEN: 'TOKEN',
+        FOLDERS_COMMANDS: 'commands',
+        FOLDERS_EVENTS: 'events',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("BOT_PREFIX is not defined in .env");
+});
+
+test('Start_GivenBotPrefixIsEmpty_ExpectFailure', () => {
+    process.env = {
+        BOT_TOKEN: 'TOKEN',
+        BOT_PREFIX: '',
+        FOLDERS_COMMANDS: 'commands',
+        FOLDERS_EVENTS: 'events',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("BOT_PREFIX is not defined in .env");
+});
+
+test('Start_GivenFoldersCommandsIsNull_ExpectFailure', () => {
+    process.env = {
+        BOT_TOKEN: 'TOKEN',
+        BOT_PREFIX: '!',
+        FOLDERS_EVENTS: 'events',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("FOLDERS_COMMANDS is not defined in .env");
+});
+
+test('Start_GivenFoldersCommandsIsEmpty_ExpectFailure', () => {
+    process.env = {
+        BOT_TOKEN: 'TOKEN',
+        BOT_PREFIX: '!',
+        FOLDERS_COMMANDS: '',
+        FOLDERS_EVENTS: 'events',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("FOLDERS_COMMANDS is not defined in .env");
+});
+
+test('Start_GivenFoldersEventsIsNull_ExpectFailure', () => {
+    process.env = {
+        BOT_TOKEN: 'TOKEN',
+        BOT_PREFIX: '!',
+        FOLDERS_COMMANDS: 'commands',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("FOLDERS_EVENTS is not defined in .env");
+});
+
+test('Start_GivenFoldersCommandsIsEmpty_ExpectFailure', () => {
+    process.env = {
+        BOT_TOKEN: 'TOKEN',
+        BOT_PREFIX: '!',
+        FOLDERS_COMMANDS: 'commands',
+        FOLDERS_EVENTS: '',
+    }
+
+    const coreClient = new CoreClient();
+    
+    expect(() => coreClient.start()).toThrow("FOLDERS_EVENTS is not defined in .env");
+});