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import codewars_test as test
import solution  # or from solution import example

# test.assert_equals(actual, expected, [optional] message)
@test.describe("Example")
def test_group():
    @test.it("test case")
    def test_case():
        test.assert_equals(1 + 1, 2)
// Since Node 10, we're using Mocha.
// You can use `chai` for assertions.
const chai = require("chai");
const assert = chai.assert;
// Uncomment the following line to disable truncating failure messages for deep equals, do:
// chai.config.truncateThreshold = 0;
// Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
// Uncomment the following to use the old assertions:
// const Test = require("@codewars/test-compat");

describe("Solution", function() {
  it("should test for something", function() {
    // Test.assertEquals(1 + 1, 2);
    // assert.strictEqual(1 + 1, 2);
  });
});
// test.js
const chai = require("chai");
const assert = chai.assert;
const { add } = require("./solution"); // Import the function to test

describe("Solution", function() {
  it("should return the correct sum for two numbers", function() {
    // Test if adding two numbers gives the correct result
    assert.strictEqual(add(1, 1), 2); // Test 1 + 1 = 2
    assert.strictEqual(add(2, 3), 5); // Test 2 + 3 = 5
    assert.strictEqual(add(-1, 1), 0); // Test -1 + 1 = 0
  });

  it("should return a number", function() {
    // Test that the result is of type number
    assert.typeOf(add(2, 3), "number"); // Should return a number
  });
});
Code
Diff
  • // Importing Chai for assertions
    const chai = require("chai");
    const assert = chai.assert;  // Or you can use expect or should, but we'll stick with assert here
    
    // Test suite using Mocha
    describe("Solution", function() {
      // Basic test case for addition
      it("should add two numbers correctly", function() {
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
      });
    
      // Basic test case for string concatenation
      it("should concatenate strings correctly", function() {
        const str1 = "Hello";
        const str2 = "World";
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
      });
    
      // Test for inequality
      it("should verify that two values are not equal", function() {
        assert.notStrictEqual(2 + 2, 5, "2 + 2 should not equal 5");
      });
    });
    
    • // Mocha + Chai test file
    • // Importing Chai for assertions
    • const chai = require("chai");
    • const assert = chai.assert;
    • const assert = chai.assert; // Or you can use expect or should, but we'll stick with assert here
    • // Mocha test suite
    • // Test suite using Mocha
    • describe("Solution", function() {
    • // Test case: Checking a simple math operation
    • it("should test basic math operations", function() {
    • // Test for 1 + 1 = 2
    • // Basic test case for addition
    • it("should add two numbers correctly", function() {
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • // Test for 1 + 2 not equal to 5
    • assert.notStrictEqual(1 + 2, 5, "1 + 2 should not equal 5");
    • });
    • // Test case: String operations
    • it("should test string concatenation", function() {
    • // Basic test case for string concatenation
    • it("should concatenate strings correctly", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Test concatenation using `+` operator
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly using +");
    • // Test concatenation using `concat` method
    • assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat()");
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
    • });
    • // Test for inequality
    • it("should verify that two values are not equal", function() {
    • assert.notStrictEqual(2 + 2, 5, "2 + 2 should not equal 5");
    • });
    • });
// Mocha + Chai test file

// Importing Chai for assertions
const chai = require("chai");
const assert = chai.assert;

// Mocha test suite
describe("Solution", function() {

  // Test case: Checking a simple math operation
  it("should test basic math operations", function() {
    // Test for 1 + 1 = 2
    assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");

    // Test for 1 + 2 not equal to 5
    assert.notStrictEqual(1 + 2, 5, "1 + 2 should not equal 5");
  });

  // Test case: String operations
  it("should test string concatenation", function() {
    const str1 = "Hello";
    const str2 = "World";

    // Test concatenation using `+` operator
    assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly using +");

    // Test concatenation using `concat` method
    assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat()");
  });

});
Code
Diff
  • // Importing the Chai assertion library
    const chai = require("chai");
    const assert = chai.assert;
    
    // Uncomment the following line to disable truncating failure messages for deep equals:
    // chai.config.truncateThreshold = 0;
    
    // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    // Uncomment the following to use the old assertions:
    // const Test = require("@codewars/test-compat");
    
    describe("Solion", function() {
      // Basic test for addition
      it("should test if 1 + 1 equals 2", function() {
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
      });
    
      // Test for string concatenation
      it("should test if strings are concatenated correctly", function() {
        const str1 = "Hello";
        const str2 = "World";
        
        // Check the concatenation using '+' operator
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
        
        // Check using the `concat()` method
        assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat()");
      });
    });
    
    • // Importing the Chai assertion library
    • const chai = require("chai");
    • const assert = chai.assert;
    • // Uncomment the following line to disable truncating failure messages for deep equals:
    • // chai.config.truncateThreshold = 0;
    • // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    • // Uncomment the following to use the old assertions:
    • // const Test = require("@codewars/test-compat");
    • describe("Solution", function() {
    • // Test case for simple arithmetic
    • it("should correctly add two numbers", function() {
    • describe("Solion", function() {
    • // Basic test for addition
    • it("should test if 1 + 1 equals 2", function() {
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • });
    • // Test case for string concatenation
    • it("should correctly concatenate two strings", function() {
    • // Test for string concatenation
    • it("should test if strings are concatenated correctly", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Check the concatenation using '+' operator
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
    • // Using the concat method
    • // Check using the `concat()` method
    • assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat()");
    • });
    • });
Code
Diff
  • // Importing the Chai assertion library
    const chai = require("chai");
    const assert = chai.assert;
    
    // Uncomment the following line to disable truncating failure messages for deep equals:
    // chai.config.truncateThreshold = 0;
    
    // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    // Uncomment the following to use the old assertions:
    // const Test = require("@codewars/test-compat");
    
    describe("Solution", function() {
      // Test case for simple arithmetic
      it("should correctly add two numbers", function() {
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
      });
    
      // Test case for string concatenation
      it("should correctly concatenate two strings", function() {
        const str1 = "Hello";
        const str2 = "World";
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
        
        // Using the concat method
        assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat()");
      });
    });
    
    • // Importing the Chai assertion library
    • const chai = require("chai");
    • const assert = chai.assert;
    • // Uncomment the following line to disable truncating failure messages for deep equals:
    • // chai.config.truncateThreshold = 0;
    • // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    • // Uncomment the following to use the old assertions:
    • // const Test = require("@codewars/test-compat");
    • describe("Solution", function() {
    • // A simple test case for adding two numbers
    • // Test case for simple arithmetic
    • it("should correctly add two numbers", function() {
    • // Test if 1 + 1 equals 2
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • });
    • // A test case for checking string concatenation
    • // Test case for string concatenation
    • it("should correctly concatenate two strings", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Check if the concatenation of str1 and str2 results in "Hello World"
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
    • // Using the concat method
    • assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat()");
    • });
    • });
Code
Diff
  • // Importing the Chai assertion library
    const chai = require("chai");
    const assert = chai.assert;
    
    // Uncomment the following line to disable truncating failure messages for deep equals:
    // chai.config.truncateThreshold = 0;
    
    // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    // Uncomment the following to use the old assertions:
    // const Test = require("@codewars/test-compat");
    
    describe("Solution", function() {
      // A simple test case for adding two numbers
      it("should correctly add two numbers", function() {
        // Test if 1 + 1 equals 2
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
      });
    
      // A test case for checking string concatenation
      it("should correctly concatenate two strings", function() {
        const str1 = "Hello";
        const str2 = "World";
        // Check if the concatenation of str1 and str2 results in "Hello World"
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
      });
    });
    
    • // Importing the Chai assertion library
    • const chai = require("chai");
    • const assert = chai.assert;
    • // Uncomment the following line to disable truncating failure messages for deep equals:
    • // chai.config.truncateThreshold = 0;
    • // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    • // Uncomment the following to use the old assertions:
    • // const Test = require("@codewars/test-compat");
    • describe("Solution", function() {
    • // A simple test case for adding two numbers
    • it("should correctly add two numbers", function() {
    • // Test if 1 + 1 equals 2
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • });
    • // A test case for checking string concatenation
    • it("should correctly concatenate two strings", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Check if the concatenation of str1 and str2 results in "Hello World"
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
    • });
    • });
Code
Diff
  • // Importing the Chai assertion library
    const chai = require("chai");
    const assert = chai.assert;
    
    // Uncomment the following line to disable truncating failure messages for deep equals:
    // chai.config.truncateThreshold = 0;
    
    // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    // Uncomment the following to use the old assertions:
    // const Test = require("@codewars/test-compat");
    
    describe("Solution", function() {
      // A simple test case for adding two numbers
      it("should correctly add two numbers", function() {
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
      });
    
      // A test case for checking string concatenation
      it("should correctly concatenate two strings", function() {
        const str1 = "Hello";
        const str2 = "World";
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
      });
    });
    
    • // Importing the Chai assertion library
    • const chai = require("chai");
    • const assert = chai.assert;
    • // Uncomment the following line to disable truncating failure messages for deep equals:
    • // chai.config.truncateThreshold = 0;
    • // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    • // Uncomment the following to use the old assertions:
    • // const Test = require("@codewars/test-compat");
    • describe("Solution", function() {
    • // Test case for basic arithmetic
    • // A simple test case for adding two numbers
    • it("should correctly add two numbers", function() {
    • // Checking if 1 + 1 equals 2
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • // Additional test: 5 + 10 should equal 15
    • assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
    • });
    • // Test case for string concatenation
    • // A test case for checking string concatenation
    • it("should correctly concatenate two strings", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Using + operator to concatenate
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly with + operator");
    • // Using concat() method to concatenate
    • assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly");
    • });
    • });
// Importing the Chai assertion library
const chai = require("chai");
const assert = chai.assert;

// Uncomment the following line to disable truncating failure messages for deep equals:
// chai.config.truncateThreshold = 0;

// Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
// Uncomment the following to use the old assertions:
// const Test = require("@codewars/test-compat");

describe("Solution", function() {
  // Test case for basic arithmetic
  it("should correctly add two numbers", function() {
    // Checking if 1 + 1 equals 2
    assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    
    // Additional test: 5 + 10 should equal 15
    assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
  });

  // Test case for string concatenation
  it("should correctly concatenate two strings", function() {
    const str1 = "Hello";
    const str2 = "World";
    
    // Using + operator to concatenate
    assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly with + operator");
    
    // Using concat() method to concatenate
    assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
  });
});
// Importing the Chai assertion library
const chai = require("chai");
const assert = chai.assert;

// Uncomment the following line to disable truncating failure messages for deep equals:
// chai.config.truncateThreshold = 0;

// Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
// Uncomment the following to use the old assertions:
// const Test = require("@codewars/test-compat");

describe("Solution", function() {
  // Test case for basic arithmetic
  it("should correctly add two numbers", function() {
    // Checking if 1 + 1 equals 2
    assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    
    // Checking if 5 + 10 equals 15
    assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
  });

  // Test case for string concatenation
  it("should correctly concatenate two strings", function() {
    const str1 = "Hello";
    const str2 = "World";
    
    // Using + operator to concatenate
    assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly with + operator");
    
    // Using concat() method to concatenate
    assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
  });
});
Code
Diff
  • // Importing the Chai assertion library
    const chai = require("chai");
    const assert = chai.assert;
    
    // Uncomment the following line to disable truncating failure messages for deep equals:
    // chai.config.truncateThreshold = 0;
    
    // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    // Uncomment the following to use the old assertions:
    // const Test = require("@codewars/test-compat");
    
    describe("Solution", function() {
      // Test case for arithmetic addition
      it("should correctly add two numbers", function() {
        // Check if 1 + 1 equals 2
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
        
        // Additional test: 5 + 10 should equal 15
        assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
      });
    
      // Test case for string concatenation
      it("should correctly concatenate two strings", function() {
        const str1 = "Hello";
        const str2 = "World";
        
        // Using + operator to concatenate
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly with +");
        
        // Using concat() method to concatenate
        assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
      });
    });
    
    
    • // Importing Chai assertion library
    • // Importing the Chai assertion library
    • const chai = require("chai");
    • const assert = chai.assert;
    • // Uncomment the following line to disable truncating failure messages for deep equals:
    • // chai.config.truncateThreshold = 0;
    • // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    • // Uncomment the following to use the old assertions:
    • // const Test = require("@codewars/test-compat");
    • describe("Solution", function() {
    • // Test case for arithmetic addition
    • it("should correctly add two numbers", function() {
    • // Assert that 1 + 1 equals 2
    • // Check if 1 + 1 equals 2
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • // Another addition test: 5 + 10 should equal 15
    • // Additional test: 5 + 10 should equal 15
    • assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
    • });
    • // Test case for string concatenation
    • it("should correctly concatenate two strings", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Using + operator to concatenate
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly with +");
    • // Using concat() method to concatenate
    • assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
    • });
    • });
Code
Diff
  • // Importing Chai assertion library
    const chai = require("chai");
    const assert = chai.assert;
    
    // Uncomment the following line to disable truncating failure messages for deep equals:
    // chai.config.truncateThreshold = 0;
    
    // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    // Uncomment the following to use the old assertions:
    // const Test = require("@codewars/test-compat");
    
    describe("Solution", function() {
      // Test case for arithmetic addition
      it("should correctly add two numbers", function() {
        // Assert that 1 + 1 equals 2
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
        
        // Another addition test: 5 + 10 should equal 15
        assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
      });
    
      // Test case for string concatenation
      it("should correctly concatenate two strings", function() {
        const str1 = "Hello";
        const str2 = "World";
        
        // Using + operator to concatenate
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly with +");
        
        // Using concat() method to concatenate
        assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
      });
    });
    
    • // Importing the Chai assertion library
    • // Importing Chai assertion library
    • const chai = require("chai");
    • const assert = chai.assert;
    • // Uncomment the following line to disable truncating failure messages for deep equals:
    • // chai.config.truncateThreshold = 0;
    • // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    • // Uncomment the following to use the old assertions:
    • // const Test = require("@codewars/test-compat");
    • describe("Solution", function() {
    • // Test case to check basic math
    • // Test case for arithmetic addition
    • it("should correctly add two numbers", function() {
    • // Simple addition test: 1 + 1 should equal 2
    • // Assert that 1 + 1 equals 2
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • // Additional check: 5 + 10 should equal 15
    • // Another addition test: 5 + 10 should equal 15
    • assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
    • });
    • // Test case to check string concatenation
    • // Test case for string concatenation
    • it("should correctly concatenate two strings", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Testing string concatenation with the `+` operator
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly using +");
    • // Testing string concatenation using `concat()`
    • // Using + operator to concatenate
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly with +");
    • // Using concat() method to concatenate
    • assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
    • });
    • });
Code
Diff
  • // Importing the Chai assertion library
    const chai = require("chai");
    const assert = chai.assert;
    
    // Uncomment the following line to disable truncating failure messages for deep equals:
    // chai.config.truncateThreshold = 0;
    
    // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    // Uncomment the following to use the old assertions:
    // const Test = require("@codewars/test-compat");
    
    describe("Solution", function() {
      // Test case to check basic math
      it("should correctly add two numbers", function() {
        // Simple addition test: 1 + 1 should equal 2
        assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
        
        // Additional check: 5 + 10 should equal 15
        assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
      });
    
      // Test case to check string concatenation
      it("should correctly concatenate two strings", function() {
        const str1 = "Hello";
        const str2 = "World";
    
        // Testing string concatenation with the `+` operator
        assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly using +");
    
        // Testing string concatenation using `concat()`
        assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
      });
    });
    
    • // Importing Chai assertion library
    • // Importing the Chai assertion library
    • const chai = require("chai");
    • const assert = chai.assert;
    • // Uncomment the following line to disable truncating failure messages for deep equals:
    • // chai.config.truncateThreshold = 0;
    • // Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
    • // Uncomment the following to use the old assertions:
    • // const Test = require("@codewars/test-compat");
    • describe("Solution", function() {
    • // Test case to check a simple arithmetic operation
    • // Test case to check basic math
    • it("should correctly add two numbers", function() {
    • // Test: Check if 1 + 1 equals 2
    • // Simple addition test: 1 + 1 should equal 2
    • assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");
    • // Another test: Check if 5 + 10 equals 15
    • // Additional check: 5 + 10 should equal 15
    • assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
    • });
    • // Test case to check string concatenation
    • it("should correctly concatenate two strings", function() {
    • const str1 = "Hello";
    • const str2 = "World";
    • // Test string concatenation using + operator
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly using + operator");
    • // Testing string concatenation with the `+` operator
    • assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly using +");
    • // Test string concatenation using concat() method
    • // Testing string concatenation using `concat()`
    • assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
    • });
    • });
// Importing Chai assertion library
const chai = require("chai");
const assert = chai.assert;

// Uncomment the following line to disable truncating failure messages for deep equals:
// chai.config.truncateThreshold = 0;

// Since Node 12, we no longer include assertions from our deprecated custom test framework by default.
// Uncomment the following to use the old assertions:
// const Test = require("@codewars/test-compat");

describe("Solution", function() {
  // Test case to check a simple arithmetic operation
  it("should correctly add two numbers", function() {
    // Test: Check if 1 + 1 equals 2
    assert.strictEqual(1 + 1, 2, "1 + 1 should equal 2");

    // Another test: Check if 5 + 10 equals 15
    assert.strictEqual(5 + 10, 15, "5 + 10 should equal 15");
  });

  // Test case to check string concatenation
  it("should correctly concatenate two strings", function() {
    const str1 = "Hello";
    const str2 = "World";

    // Test string concatenation using + operator
    assert.strictEqual(str1 + " " + str2, "Hello World", "Strings should concatenate correctly using + operator");

    // Test string concatenation using concat() method
    assert.strictEqual(str1.concat(" ", str2), "Hello World", "Strings should concatenate correctly using concat method");
  });
});
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