chore: refactoring and tests, splitting up files (#12495)

packages/app/src/components/prompt-input/placeholder.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, test } from "bun:test"
+import { promptPlaceholder } from "./placeholder"
+
+describe("promptPlaceholder", () => {
+  const t = (key: string, params?: Record<string, string>) => `${key}${params?.example ? `:${params.example}` : ""}`
+
+  test("returns shell placeholder in shell mode", () => {
+    const value = promptPlaceholder({
+      mode: "shell",
+      commentCount: 0,
+      example: "example",
+      t,
+    })
+    expect(value).toBe("prompt.placeholder.shell")
+  })
+
+  test("returns summarize placeholders for comment context", () => {
+    expect(promptPlaceholder({ mode: "normal", commentCount: 1, example: "example", t })).toBe(
+      "prompt.placeholder.summarizeComment",
+    )
+    expect(promptPlaceholder({ mode: "normal", commentCount: 2, example: "example", t })).toBe(
+      "prompt.placeholder.summarizeComments",
+    )
+  })
+
+  test("returns default placeholder with example", () => {
+    const value = promptPlaceholder({
+      mode: "normal",
+      commentCount: 0,
+      example: "translated-example",
+      t,
+    })
+    expect(value).toBe("prompt.placeholder.normal:translated-example")
+  })
+})