test: add unit tests for reply utility function

Author: zojize

test/reply.test.ts

@@ -0,0 +1,48 @@
+import type { ChatInputCommandInteraction } from 'discord.js'
+import { MessageFlags } from 'discord.js'
+import { describe, expect, it, vi } from 'vitest'
+import { reply } from '../src/runtime/server/utils/reply'
+
+describe('reply', () => {
+  const MockClient = vi.fn()
+  const mockInteraction = () => {
+    const mock = {
+      reply: vi.fn(),
+      editReply: vi.fn(),
+    }
+    return [mock as unknown as ChatInputCommandInteraction, mock] as const
+  }
+
+  it('should return a reply function', () => {
+    const replyFunction = reply('Hello, world!')
+    expect(replyFunction).toBeInstanceOf(Function)
+  })
+
+  it('should reply with the correct content', async () => {
+    const [interaction, mock] = mockInteraction()
+    const client = new MockClient()
+    reply('Hello, world!').call(client, interaction as unknown as ChatInputCommandInteraction, client)
+    expect(mock.reply).toHaveBeenCalledExactlyOnceWith({
+      content: 'Hello, world!',
+    })
+  })
+
+  it('should edit reply with the correct content', async () => {
+    const [interaction, mock] = mockInteraction()
+    const client = new MockClient()
+    reply.edit('Hello, world!').call(client, interaction as unknown as ChatInputCommandInteraction, client)
+    expect(mock.editReply).toHaveBeenCalledExactlyOnceWith({
+      content: 'Hello, world!',
+    })
+  })
+
+  it('should reply with ephemeral flag', async () => {
+    const [interaction, mock] = mockInteraction()
+    const client = new MockClient()
+    reply.ephemeral('This is ephemeral!').call(client, interaction as unknown as ChatInputCommandInteraction, client)
+    expect(mock.reply).toHaveBeenCalledExactlyOnceWith({
+      content: 'This is ephemeral!',
+      flags: MessageFlags.Ephemeral,
+    })
+  })
+})