From 632e70ed711f4b8455d67200f3ef4dec0d48ab64 Mon Sep 17 00:00:00 2001
From: Bakhtier Gaibulloev <slashmsu@gmail.com>
Date: Wed, 4 Jun 2025 01:13:00 +0200
Subject: [PATCH] test(stack): cover peek on empty stack

---
 AGENTS.md                     | 35 +++++++++++++++++++++++++++++++++++
 tests/HashMap/HashMap.spec.ts |  6 +++---
 tests/Stack/Stack.spec.ts     |  8 +++++++-
 3 files changed, 45 insertions(+), 4 deletions(-)
 create mode 100644 AGENTS.md

diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..2c802cb
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,35 @@
+# Instructions for OpenAI Codex
+
+This file provides guidelines for OpenAI Codex to ensure code quality and consistency within this project.
+
+## General Instructions
+
+1. **Follow Existing Code Style**: Adhere to the style already present in the repository.
+2. **Use TypeScript**: All new code must be written in TypeScript.
+3. **Meaningful Names**: Use descriptive names for variables and functions.
+4. **Comments**: Comment complex logic to explain its purpose.
+
+## Testing
+
+1. **Testing Framework**: Use Mocha and Chai for tests.
+2. **Run Tests**: Compile the project then run `npm test` to execute all tests.
+3. **Test Files**: Maintain and extend existing test files when adding new functionality.
+
+## Commands
+
+1. **Build**: `npm run build`
+2. **Run All Tests**: `npm test`
+3. **Watch Tests**: `npm run test_watch`
+4. **Coverage**: `npm run cover`
+5. **Lint**: `npx tslint -c tslint.json -p tsconfig.json`
+
+## Pull Request Guidelines
+
+1. **Description**: Provide a clear description of the changes.
+2. **Related Issues**: Reference any related issues.
+3. **Tests**: Ensure all tests pass before submission.
+4. **Single Concern**: Keep pull requests focused on a single concern.
+
+## Important
+
+After making any changes, Codex MUST run `npm run build` and `npm test` to confirm that the build and tests pass.
diff --git a/tests/HashMap/HashMap.spec.ts b/tests/HashMap/HashMap.spec.ts
index 26e0919..846ecfd 100644
--- a/tests/HashMap/HashMap.spec.ts
+++ b/tests/HashMap/HashMap.spec.ts
@@ -123,9 +123,9 @@ describe('HashMap', () => {
             const result = map.values();
 
             expect(result.length).to.equal(3);
-            expect(result.includes(42)).to.be.true;
-            expect(result.includes(99)).to.be.true;
-            expect(result.includes(123)).to.be.true;
+            expect(result).to.include(42);
+            expect(result).to.include(99);
+            expect(result).to.include(123);
         });
 
         it('should return an empty array if the map is empty', () => {
diff --git a/tests/Stack/Stack.spec.ts b/tests/Stack/Stack.spec.ts
index 96f3ed4..f8c9981 100644
--- a/tests/Stack/Stack.spec.ts
+++ b/tests/Stack/Stack.spec.ts
@@ -20,12 +20,18 @@ describe('Stack', () => {
 
     });
 
-    it('pop if stacl is empty', () => {
+    it('pop if stack is empty', () => {
 
         expect(stack.pop()).equal(null);
 
     });
 
+    it('peek on empty stack', () => {
+
+        expect(stack.peek()).equal(null);
+
+    });
+
     it('peek', () => {
 
         stack.push(1);