From 78ff3de8364869f5a9ef21c11c9f3552856987db Mon Sep 17 00:00:00 2001
From: Andrew Datsenko <asd@meta.com>
Date: Tue, 4 Feb 2025 10:06:15 -0800
Subject: [PATCH] [skip ci] Add `.toBeFalsy` and `.toBeTruthy` (#49169)

Summary:

Changelog: [Internal]
Add missing jest expect apis

Reviewed By: rubennorte

Differential Revision: D69119852
---
 .../react-native-fantom/runtime/expect.js     | 18 +++++++++
 .../src/__tests__/expect-itest.js             | 39 +++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/packages/react-native-fantom/runtime/expect.js b/packages/react-native-fantom/runtime/expect.js
index 2a23b53f8ee9..05d99538dc1c 100644
--- a/packages/react-native-fantom/runtime/expect.js
+++ b/packages/react-native-fantom/runtime/expect.js
@@ -144,6 +144,24 @@ class Expect {
     }
   }
 
+  toBeFalsy(): void {
+    const pass = Boolean(this.#received) === false;
+    if (!this.#isExpectedResult(pass)) {
+      throw new ErrorWithCustomBlame(
+        `Expected ${String(this.#received)}${this.#maybeNotLabel()} to be falsy`,
+      ).blameToPreviousFrame();
+    }
+  }
+
+  toBeTruthy(): void {
+    const pass = Boolean(this.#received);
+    if (!this.#isExpectedResult(pass)) {
+      throw new ErrorWithCustomBlame(
+        `Expected ${String(this.#received)}${this.#maybeNotLabel()} to be truthy`,
+      ).blameToPreviousFrame();
+    }
+  }
+
   toThrow(expected?: string): void {
     if (expected != null && typeof expected !== 'string') {
       throw new ErrorWithCustomBlame(
diff --git a/packages/react-native-fantom/src/__tests__/expect-itest.js b/packages/react-native-fantom/src/__tests__/expect-itest.js
index 35d0f91fd03f..a7edafea6996 100644
--- a/packages/react-native-fantom/src/__tests__/expect-itest.js
+++ b/packages/react-native-fantom/src/__tests__/expect-itest.js
@@ -178,6 +178,45 @@ describe('expect', () => {
     }).toThrow();
   });
 
+  test('toBeFalsy', () => {
+    expect(false).toBeFalsy();
+    expect(0).toBeFalsy();
+    expect('').toBeFalsy();
+    expect(null).toBeFalsy();
+    expect(undefined).toBeFalsy();
+    expect(NaN).toBeFalsy();
+    expect([]).not.toBeFalsy();
+    expect(['']).not.toBeFalsy();
+
+    expect(() => {
+      expect(true).toBeFalsy();
+    }).toThrow();
+
+    expect(() => {
+      expect(false).not.toBeFalsy();
+    }).toThrow();
+  });
+
+  test('toBeTruthy', () => {
+    expect(true).toBeTruthy();
+    expect([]).toBeTruthy();
+    expect('a').toBeTruthy();
+    expect(false).not.toBeTruthy();
+    expect(0).not.toBeTruthy();
+    expect('').not.toBeTruthy();
+    expect(null).not.toBeTruthy();
+    expect(undefined).not.toBeTruthy();
+    expect(NaN).not.toBeTruthy();
+
+    expect(() => {
+      expect(false).toBeTruthy();
+    }).toThrow();
+
+    expect(() => {
+      expect(true).not.toBeTruthy();
+    }).toThrow();
+  });
+
   ['toBeCalled', 'toHaveBeenCalled'].map(toHaveBeenCalledAlias =>
     test(toHaveBeenCalledAlias, () => {
       const fn = jest.fn();