test: 新增测试代码文件

src/utils/__tests__/diff.test.ts

@@ -40,9 +40,10 @@ describe("getPatchFromContents", () => {
       oldContent: "hello\nworld",
       newContent: "hello\nplanet",
     });
-    expect(hunks.length).toBeGreaterThan(0);
-    expect(hunks[0].lines.some((l: string) => l.startsWith("-"))).toBe(true);
-    expect(hunks[0].lines.some((l: string) => l.startsWith("+"))).toBe(true);
+    expect(hunks.length).toBe(1);
+    const allLines = hunks[0].lines;
+    expect(allLines).toContain("-world");
+    expect(allLines).toContain("+planet");
   });
 
   test("returns empty hunks for identical content", () => {
@@ -73,5 +74,44 @@ describe("getPatchFromContents", () => {
       newContent: "new content",
     });
     expect(hunks.length).toBeGreaterThan(0);
+    const allLines = hunks.flatMap((h: any) => h.lines);
+    expect(allLines.some((l: string) => l.startsWith("+"))).toBe(true);
+  });
+
+  test("handles content with dollar signs", () => {
+    const hunks = getPatchFromContents({
+      filePath: "test.txt",
+      oldContent: "price: $5",
+      newContent: "price: $10",
+    });
+    expect(hunks.length).toBeGreaterThan(0);
+    const allLines = hunks.flatMap((h: any) => h.lines);
+    expect(allLines.some((l: string) => l.includes("$"))).toBe(true);
+    // Verify dollar signs are unescaped (not the token)
+    expect(allLines.some((l: string) => l.includes("<<:DOLLAR_TOKEN:>>"))).toBe(false);
+  });
+
+  test("handles deleting all content", () => {
+    const hunks = getPatchFromContents({
+      filePath: "test.txt",
+      oldContent: "line1\nline2\nline3",
+      newContent: "",
+    });
+    expect(hunks.length).toBeGreaterThan(0);
+    const allLines = hunks.flatMap((h: any) => h.lines);
+    expect(allLines.some((l: string) => l.startsWith("-"))).toBe(true);
+    expect(allLines.every((l: string) => l.startsWith("-") || l.startsWith(" ") || l.startsWith("\\"))).toBe(true);
+  });
+
+  test("ignoreWhitespace treats indentation changes as identical", () => {
+    const old = "function foo() {\n  return 42;\n}\n";
+    const nw = "function foo() {\n\treturn 42;\n}\n";
+    const hunks = getPatchFromContents({
+      filePath: "test.txt",
+      oldContent: old,
+      newContent: nw,
+      ignoreWhitespace: true,
+    });
+    expect(hunks).toEqual([]);
   });
 });