test: 新增测试代码文件

src/utils/__tests__/argumentSubstitution.test.ts

@@ -29,6 +29,14 @@ describe("parseArguments", () => {
     ]);
   });
 
+  test("handles escaped quotes inside quoted strings", () => {
+    expect(parseArguments('foo "hello \\"world\\"" baz')).toEqual([
+      "foo",
+      'hello "world"',
+      "baz",
+    ]);
+  });
+
   test("returns empty for empty string", () => {
     expect(parseArguments("")).toEqual([]);
   });
@@ -101,6 +109,16 @@ describe("substituteArguments", () => {
     );
   });
 
+  test("replaces out-of-range index with empty string", () => {
+    expect(substituteArguments("$5", "hello world")).toBe("");
+  });
+
+  test("reuses same placeholder multiple times", () => {
+    expect(substituteArguments("cmd $0 $1 $0", "alpha beta")).toBe(
+      "cmd alpha beta alpha"
+    );
+  });
+
   test("replaces named arguments", () => {
     expect(
       substituteArguments("file: $name", "test.txt", true, ["name"])