test: 添加一大堆测试文件

src/utils/__tests__/markdown.test.ts

@@ -0,0 +1,58 @@
+import { describe, expect, test } from "bun:test";
+import { padAligned } from "../markdown";
+
+describe("padAligned", () => {
+  test("left-aligns: pads with spaces on right", () => {
+    const result = padAligned("hello", 5, 10, "left");
+    expect(result).toBe("hello     ");
+    expect(result.length).toBe(10);
+  });
+
+  test("right-aligns: pads with spaces on left", () => {
+    const result = padAligned("hello", 5, 10, "right");
+    expect(result).toBe("     hello");
+    expect(result.length).toBe(10);
+  });
+
+  test("center-aligns: pads with spaces on both sides", () => {
+    const result = padAligned("hi", 2, 6, "center");
+    expect(result).toBe("  hi  ");
+    expect(result.length).toBe(6);
+  });
+
+  test("no padding when displayWidth equals targetWidth", () => {
+    const result = padAligned("hello", 5, 5, "left");
+    expect(result).toBe("hello");
+  });
+
+  test("handles content wider than targetWidth", () => {
+    const result = padAligned("hello world", 11, 5, "left");
+    expect(result).toBe("hello world");
+  });
+
+  test("null/undefined align defaults to left", () => {
+    expect(padAligned("hi", 2, 5, null)).toBe("hi   ");
+    expect(padAligned("hi", 2, 5, undefined)).toBe("hi   ");
+  });
+
+  test("handles empty string content", () => {
+    const result = padAligned("", 0, 5, "center");
+    expect(result).toBe("     ");
+  });
+
+  test("handles zero displayWidth", () => {
+    const result = padAligned("", 0, 3, "left");
+    expect(result).toBe("   ");
+  });
+
+  test("handles zero targetWidth", () => {
+    const result = padAligned("hello", 5, 0, "left");
+    expect(result).toBe("hello");
+  });
+
+  test("center alignment with odd padding distribution", () => {
+    const result = padAligned("hi", 2, 7, "center");
+    expect(result).toBe("  hi   ");
+    expect(result.length).toBe(7);
+  });
+});