1 files changed, 32 insertions, 0 deletions
diff --git a/src/utils/anonymous.test.ts b/src/utils/anonymous.test.ts
index 2da613f..45896bf 100644
--- a/src/utils/anonymous.test.ts
+++ b/src/utils/anonymous.test.ts
@@ -9,6 +9,7 @@ import {
   identity,
   instanciate,
   pass,
+  transform,
 } from "./anonymous.ts";
 import { assertSpyCalls, spy } from "@std/testing/mock";
 import { FALSE, TRUE } from "../../tests/fixtures/test_data.ts";
@@ -128,3 +129,34 @@ describe("extremeBy", () => {
     assertEquals(extremeBy(data, "min"), Infinity);
   });
 });
+
+describe("transform", () => {
+  it("applies the function to the input", () => {
+    const result = transform(5, (x) => x * 2);
+    assertEquals(result, 10);
+  });
+
+  it("works with strings", () => {
+    const result = transform("hello", (x) => x.toUpperCase());
+    assertEquals(result, "HELLO");
+  });
+
+  it("works with objects", () => {
+    const input = { a: 1, b: 2 };
+    const result = transform(input, ({ a, b }) => a + b);
+    assertEquals(result, 3);
+  });
+
+  it("returns the correct type", () => {
+    const TRUE = true;
+    const FALSE = false;
+    const result = transform(TRUE, (x) => !x);
+    assertEquals(result, FALSE);
+  });
+
+  it("works with identity function", () => {
+    const input = [1, 2, 3];
+    const result = transform(input, identity);
+    assertEquals(result, input);
+  });
+});