feat: Personalize thinking prompts with agent name (#234)

src/tests/cli/thinkingMessages.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, test } from "bun:test";
+import { getRandomThinkingMessage } from "../../cli/helpers/thinkingMessages";
+
+describe("Thinking messages", () => {
+  test("returns formatted message with agent name", () => {
+    const message = getRandomThinkingMessage("Letta");
+
+    // Should be in format "Letta is <verb>ing"
+    expect(message).toMatch(/^Letta is \w+$/);
+    expect(message.startsWith("Letta is ")).toBe(true);
+  });
+
+  test("returns capitalized verb without agent name", () => {
+    const message = getRandomThinkingMessage();
+
+    // Should be a capitalized verb (e.g., "Thinking", "Processing")
+    expect(message).toMatch(/^[A-Z][a-z]+$/);
+    expect(message[0]).toMatch(/[A-Z]/);
+  });
+
+  test("handles null agent name", () => {
+    const message = getRandomThinkingMessage(null);
+
+    // Should fall back to capitalized verb
+    expect(message).toMatch(/^[A-Z][a-z]+$/);
+  });
+
+  test("handles empty string agent name", () => {
+    const message = getRandomThinkingMessage("");
+
+    // Should fall back to capitalized verb (empty string is falsy)
+    expect(message).toMatch(/^[A-Z][a-z]+$/);
+  });
+
+  test("generates different messages on multiple calls", () => {
+    const messages = new Set<string>();
+
+    // Generate 10 messages, should get some variety
+    for (let i = 0; i < 10; i++) {
+      messages.add(getRandomThinkingMessage("Agent"));
+    }
+
+    // Should have more than 1 unique message (with high probability)
+    expect(messages.size).toBeGreaterThan(1);
+  });
+});