Test Writing

/**
 * Define a test suite with a descriptive name and specification functions
 * @param description - Descriptive name for the test suite
 * @param specDefinitions - Function containing it() calls and setup
 */
function describe(description: string, specDefinitions: () => void): void;

/**
 * Skip/disable a test suite (will not be executed)
 * @param description - Descriptive name for the skipped test suite
 * @param specDefinitions - Function containing it() calls and setup
 */
function xdescribe(description: string, specDefinitions: () => void): void;

describe("User Authentication", function() {
  // Test specifications go here
  it("should validate user credentials", function() {
    // Test implementation
  });

  describe("Password Reset", function() {
    // Nested describe blocks for sub-functionality
    it("should send reset email", function() {
      // Test implementation
    });
  });
});

// Skip entire test suite during development/debugging
xdescribe("Feature Under Development", function() {
  it("should work eventually", function() {
    // This won't run
  });
});

/**
 * Define a test specification with optional timeout
 * @param description - Descriptive name for the test
 * @param specFunction - Test function, optionally accepting done callback
 * @param timeout - Optional timeout in milliseconds (default: 5000)
 */
function it(description: string, specFunction: (done?: () => void) => void, timeout?: number): void;

/**
 * Skip/disable a test specification (will not be executed)
 * @param description - Descriptive name for the skipped test
 * @param specFunction - Test function that won't be executed
 */
function xit(description: string, specFunction: () => void): void;

describe("Calculator", function() {
  it("should add two numbers", function() {
    const result = add(2, 3);
    expect(result).toEqual(5);
  });

  it("should handle async operations", function(done) {
    setTimeout(function() {
      expect(true).toBe(true);
      done();
    }, 100);
  });

  it("should timeout after custom duration", function(done) {
    // This test will timeout after 1 second instead of default 5 seconds
    setTimeout(done, 500);
  }, 1000);

  it("should handle async errors", function(done) {
    setTimeout(function() {
      try {
        expect(false).toBe(true);
        done();
      } catch (error) {
        done(error); // Pass error to done() to fail the test
      }
    }, 100);
  });

  // Skip this test during development
  xit("should handle edge case", function() {
    // This won't run
  });
});

/**
 * Run setup function before each test specification in the suite
 * @param setupFunction - Function to run before each test, optionally accepting done callback
 * @param timeout - Optional timeout in milliseconds for async setup
 */
function beforeEach(setupFunction: (done?: () => void) => void, timeout?: number): void;

/**
 * Run teardown function after each test specification in the suite
 * @param teardownFunction - Function to run after each test, optionally accepting done callback
 * @param timeout - Optional timeout in milliseconds for async teardown
 */
function afterEach(teardownFunction: (done?: () => void) => void, timeout?: number): void;

describe("Database Operations", function() {
  let database;

  beforeEach(function() {
    database = new MockDatabase();
    database.connect();
  });

  afterEach(function() {
    database.disconnect();
    database = null;
  });

  // Async setup and teardown
  beforeEach(function(done) {
    initializeTestData(function() {
      done();
    });
  });

  afterEach(function(done) {
    cleanupTestData(function() {
      done();
    });
  });

  it("should save user data", function() {
    const user = { name: "John", email: "john@example.com" };
    const result = database.save(user);
    expect(result.success).toBe(true);
  });
});

/**
 * Create an expectation for testing actual values
 * @param actual - The actual value to test
 * @returns Matchers object with assertion methods
 */
function expect(actual: any): jasmine.Matchers;

interface jasmine.Matchers {
  /** Assert strict equality (===) */
  toBe(expected: any): boolean;
  /** Assert deep equality for objects and arrays */
  toEqual(expected: any): boolean;
  /** Assert string or regex match */
  toMatch(expected: string | RegExp): boolean;
  /** Assert value is null */
  toBeNull(): boolean;
  /** Assert value is undefined */
  toBeUndefined(): boolean;
  /** Assert value is truthy */
  toBeTruthy(): boolean;
  /** Assert value is falsy */
  toBeFalsy(): boolean;
  /** Assert array/string contains value */
  toContain(expected: any): boolean;
  /** Assert numeric greater than */
  toBeGreaterThan(expected: number): boolean;
  /** Assert numeric less than */
  toBeLessThan(expected: number): boolean;
  /** Assert function throws exception */
  toThrow(expected?: any): boolean;
  /** Assert spy was called (from jasmine-reporters) */
  toHaveBeenCalled(): boolean;
  /** Assert spy was called with specific arguments (from jasmine-reporters) */
  toHaveBeenCalledWith(...args: any[]): boolean;
  /** Negate any matcher */
  not: jasmine.Matchers;
}

describe("Matchers", function() {
  it("should demonstrate basic matchers", function() {
    expect(5).toBe(5);                    // Strict equality
    expect({name: "John"}).toEqual({name: "John"}); // Deep equality
    expect("hello world").toMatch(/world/); // Regex match
    expect(null).toBeNull();              // Null check
    expect(undefined).toBeUndefined();    // Undefined check
    expect("truthy").toBeTruthy();        // Truthy check
    expect(0).toBeFalsy();                // Falsy check
    expect([1, 2, 3]).toContain(2);       // Array contains
    expect(10).toBeGreaterThan(5);        // Numeric comparison
    expect(3).toBeLessThan(10);           // Numeric comparison
  });

  it("should demonstrate negation", function() {
    expect(5).not.toBe(10);
    expect("hello").not.toMatch(/goodbye/);
  });

  it("should test exceptions", function() {
    expect(function() {
      throw new Error("Something went wrong");
    }).toThrow();

    expect(function() {
      throw new Error("Specific error");
    }).toThrow("Specific error");
  });
});

/**
 * Create a spy on an object method to track calls and control behavior
 * @param object - Object containing the method to spy on
 * @param method - Method name to spy on
 * @returns Spy object with tracking and stubbing methods
 */
function spyOn(object: any, method: string): jasmine.Spy;

interface jasmine.Spy {
  /** Make spy return specific value */
  andReturn(value: any): jasmine.Spy;
  /** Make spy throw specific exception */
  andThrow(exception: any): jasmine.Spy;
  /** Make spy call through to original method */
  andCallThrough(): jasmine.Spy;
  /** Make spy call fake function instead */
  andCallFake(fakeFunction: Function): jasmine.Spy;
  /** Array of all call objects */
  calls: any[];
  /** Most recent call object with args */
  mostRecentCall: { args: any[] };
  /** Array of argument arrays for each call */
  argsForCall: any[][];
  /** Number of times spy was called */
  callCount: number;
}

describe("User Service", function() {
  let userService, httpClient;

  beforeEach(function() {
    httpClient = {
      get: function() {},
      post: function() {}
    };
    userService = new UserService(httpClient);
  });

  it("should call HTTP client with correct URL", function() {
    spyOn(httpClient, 'get').andReturn({id: 1, name: "John"});
    
    const user = userService.getUser(123);
    
    expect(httpClient.get).toHaveBeenCalled();
    expect(httpClient.get).toHaveBeenCalledWith('/users/123');
    expect(httpClient.get.callCount).toBe(1);
    expect(user.name).toBe("John");
  });

  it("should handle errors from HTTP client", function() {
    spyOn(httpClient, 'get').andThrow(new Error("Network error"));
    
    expect(function() {
      userService.getUser(123);
    }).toThrow("Network error");
  });

  it("should use fake implementation", function() {
    spyOn(httpClient, 'post').andCallFake(function(url, data) {
      return { success: true, id: 999 };
    });
    
    const result = userService.createUser({name: "Jane"});
    expect(result.id).toBe(999);
  });
});

/**
 * Wait for asynchronous condition to become true
 * @param latchFunction - Function that returns true when condition is met
 * @param timeoutMessage - Message to display if timeout occurs
 * @param timeout - Timeout in milliseconds (default: 5000)
 */
function waitsFor(latchFunction: () => boolean, timeoutMessage?: string, timeout?: number): void;

/**
 * Wait for specified duration
 * @param timeout - Time to wait in milliseconds
 */
function waits(timeout: number): void;

/**
 * Execute function in test context (used with waits/waitsFor)
 * @param asyncMethod - Function to execute
 */
function runs(asyncMethod: () => void): void;

describe("Async Operations", function() {
  it("should handle async with done callback", function(done) {
    setTimeout(function() {
      expect(true).toBe(true);
      done();
    }, 100);
  });

  it("should use waitsFor pattern", function() {
    let completed = false;
    
    runs(function() {
      setTimeout(function() {
        completed = true;
      }, 100);
    });
    
    waitsFor(function() {
      return completed;
    }, "operation to complete", 1000);
    
    runs(function() {
      expect(completed).toBe(true);
    });
  });

  it("should use waits pattern", function() {
    let value = 0;
    
    runs(function() {
      setTimeout(function() {
        value = 42;
      }, 50);
    });
    
    waits(100);
    
    runs(function() {
      expect(value).toBe(42);
    });
  });
});

/**
 * Get current Jasmine environment for configuration
 * @returns Jasmine environment object
 */
function jasmine.getEnv(): jasmine.Env;

interface jasmine.Env {
  /** Default timeout for async operations in milliseconds */
  defaultTimeoutInterval: number;
  /** Execute all registered specs */
  execute(): void;
  /** Add reporter to environment */
  addReporter(reporter: any): void;
}

// Set default timeout for all async tests
jasmine.getEnv().defaultTimeoutInterval = 10000;

// Add custom reporter
jasmine.getEnv().addReporter(new CustomReporter());