Validation and Helpers

/**
 * Validates OpenAPI/Swagger specifications for correctness
 * @param spec - OpenAPI specification object to validate
 * @throws Error if specification is invalid
 */
function validateApiSpec(spec: any): Promise<void>;

import { validateApiSpec, expect } from "@loopback/testlab";

// Valid OpenAPI 3.0 specification
const validSpec = {
  openapi: "3.0.0",
  info: {
    title: "Test API",
    version: "1.0.0"
  },
  paths: {
    "/users": {
      get: {
        responses: {
          "200": {
            description: "List of users",
            content: {
              "application/json": {
                schema: {
                  type: "array",
                  items: {
                    type: "object",
                    properties: {
                      id: { type: "string" },
                      name: { type: "string" }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
};

// Validate specification - should not throw
await validateApiSpec(validSpec);

// Test invalid specification
const invalidSpec = {
  openapi: "3.0.0",
  // Missing required 'info' property
  paths: {}
};

try {
  await validateApiSpec(invalidSpec);
  throw new Error("Should have thrown validation error");
} catch (error) {
  expect(error.message).to.match(/invalid/i);
}

// Use in API testing
describe("API Specification Tests", () => {
  it("should have valid OpenAPI spec", async () => {
    const spec = loadApiSpecification();
    await validateApiSpec(spec);
  });

  it("should validate generated spec", async () => {
    const app = createTestApplication();
    const spec = app.getApiSpecification();
    await validateApiSpec(spec);
  });
});

/**
 * JSON encoding utility that handles edge cases
 * Converts values to JSON-serializable format by removing undefined properties
 * and handling special types like Date and Function
 */
function toJSON<T>(value: T): T;

// Specific overloads for different types
function toJSON(value: Date): string;
function toJSON(value: Function): undefined;
function toJSON(value: unknown[]): unknown[];
function toJSON(value: object): object;
function toJSON(value: undefined): undefined;
function toJSON(value: null): null;
function toJSON(value: number): number;
function toJSON(value: boolean): boolean;
function toJSON(value: string): string;

// Union type overloads
function toJSON(value: unknown[] | null): unknown[] | null;
function toJSON(value: unknown[] | undefined): unknown[] | undefined;
function toJSON(value: unknown[] | null | undefined): unknown[] | null | undefined;
function toJSON(value: object | null): object | null;
function toJSON(value: object | undefined): object | undefined;
function toJSON(value: object | null | undefined): object | null | undefined;

import { toJSON, expect } from "@loopback/testlab";

// Handle Date objects
const date = new Date("2023-01-01T00:00:00.000Z");
const dateJson = toJSON(date);
expect(dateJson).to.equal("2023-01-01T00:00:00.000Z");

// Handle Functions (converted to undefined)
const func = () => "hello";
const funcJson = toJSON(func);
expect(funcJson).to.be.undefined();

// Handle objects with undefined properties
const objWithUndefined = {
  name: "Alice",
  age: undefined,
  active: true,
  metadata: {
    created: new Date("2023-01-01"),
    updated: undefined
  }
};

const cleanObj = toJSON(objWithUndefined);
// undefined properties are removed during JSON conversion
expect(cleanObj).to.not.have.property("age");
expect(cleanObj.metadata).to.not.have.property("updated");
expect(cleanObj.name).to.equal("Alice");
expect(cleanObj.active).to.be.true();

// Handle arrays
const mixedArray = [1, "hello", new Date("2023-01-01"), undefined, null];
const cleanArray = toJSON(mixedArray);
expect(cleanArray).to.eql([1, "hello", "2023-01-01T00:00:00.000Z", null, null]);

// Use in API testing for comparing expected vs actual responses
const expectedResponse = {
  id: 123,
  name: "Test User",
  createdAt: new Date("2023-01-01"),
  metadata: undefined // This will be removed
};

const apiResponse = {
  id: 123,
  name: "Test User",
  createdAt: "2023-01-01T00:00:00.000Z"
  // No metadata property
};

// Compare using toJSON to normalize
expect(toJSON(expectedResponse)).to.eql(apiResponse);

// Handle nested objects and arrays
const complexData = {
  users: [
    {
      id: 1,
      name: "Alice",
      lastLogin: new Date("2023-01-01"),
      preferences: undefined
    },
    {
      id: 2,
      name: "Bob",
      lastLogin: new Date("2023-01-02"),
      preferences: {theme: "dark", notifications: true}
    }
  ],
  metadata: {
    total: 2,
    generated: new Date("2023-01-03"),
    cached: undefined
  }
};

const normalizedData = toJSON(complexData);
expect(normalizedData.users[0]).to.not.have.property("preferences");
expect(normalizedData.users[0].lastLogin).to.be.a.String();
expect(normalizedData.metadata).to.not.have.property("cached");

/**
 * Generic type for test definition functions (it, describe, etc.)
 */
type TestDefinition<ARGS extends unknown[], RETVAL> = (
  name: string,
  ...args: ARGS
) => RETVAL;

/**
 * Helper function for skipping tests when a certain condition is met
 * @param skip - Whether to skip the test
 * @param verb - Test function (it, describe) with skip capability
 * @param name - Test name
 * @param args - Additional test arguments
 * @returns Result of calling verb or verb.skip
 */
function skipIf<ARGS extends unknown[], RETVAL>(
  skip: boolean,
  verb: TestDefinition<ARGS, RETVAL> & {skip: TestDefinition<ARGS, RETVAL>},
  name: string,
  ...args: ARGS
): RETVAL;

/**
 * Helper function for skipping tests on Travis CI
 * @param verb - Test function (it, describe) with skip capability
 * @param name - Test name
 * @param args - Additional test arguments
 * @returns Result of calling verb or verb.skip if on Travis
 */
function skipOnTravis<ARGS extends unknown[], RETVAL>(
  verb: TestDefinition<ARGS, RETVAL> & {skip: TestDefinition<ARGS, RETVAL>},
  name: string,
  ...args: ARGS
): RETVAL;

import { skipIf, skipOnTravis } from "@loopback/testlab";

// Skip based on feature flags
const features = {
  freeFormProperties: process.env.ENABLE_FREEFORM === "true",
  advancedAuth: process.env.ENABLE_ADVANCED_AUTH === "true",
  experimentalFeatures: process.env.NODE_ENV === "development"
};

// Skip test suite if feature not enabled
skipIf(
  !features.freeFormProperties,
  describe,
  "free-form properties (strict: false)",
  () => {
    it("should allow arbitrary properties", () => {
      // Test implementation
    });

    it("should validate known properties", () => {
      // Test implementation
    });
  }
);

// Skip individual test based on condition
skipIf(
  !features.advancedAuth,
  it,
  "should support multi-factor authentication",
  async () => {
    // Test implementation for MFA
  }
);

// Skip based on environment
skipIf(
  process.platform === "win32",
  it,
  "should handle Unix file permissions",
  () => {
    // Unix-specific test
  }
);

// Skip on Travis CI (for tests that don't work well in CI)
skipOnTravis(it, "should connect to external service", async () => {
  // Test that requires external network access
});

skipOnTravis(describe, "Integration tests with external APIs", () => {
  it("should fetch data from API", async () => {
    // External API test
  });
});

// Complex conditional skipping
const isCI = process.env.CI === "true";
const hasDockerAccess = process.env.DOCKER_AVAILABLE === "true";

skipIf(
  isCI && !hasDockerAccess,
  describe,
  "Docker integration tests",
  () => {
    it("should start container", () => {
      // Docker test
    });
  }
);

// Skip based on Node.js version
const nodeVersion = process.version;
const isOldNode = parseInt(nodeVersion.slice(1)) < 14;

skipIf(
  isOldNode,
  it,
  "should use modern JavaScript features",
  () => {
    // Test using features from Node 14+
  }
);

// Dynamic test generation with conditional skipping
const testCases = [
  {name: "basic", condition: true},
  {name: "advanced", condition: features.advancedAuth},
  {name: "experimental", condition: features.experimentalFeatures}
];

testCases.forEach(testCase => {
  skipIf(
    !testCase.condition,
    it,
    `should handle ${testCase.name} scenario`,
    () => {
      // Test implementation
    }
  );
});

import { skipIf, skipOnTravis } from "@loopback/testlab";

// Environment detection helpers
const isCI = process.env.CI === "true";
const isTravis = process.env.TRAVIS === "true";
const isGitHubActions = process.env.GITHUB_ACTIONS === "true";
const isLocal = !isCI;

// Database availability
const hasDatabase = process.env.DATABASE_URL !== undefined;
const hasRedis = process.env.REDIS_URL !== undefined;

// External service availability
const hasS3Access = process.env.AWS_ACCESS_KEY_ID !== undefined;
const hasEmailService = process.env.SMTP_HOST !== undefined;

// Skip tests based on service availability
skipIf(!hasDatabase, describe, "Database integration tests", () => {
  it("should connect to database", async () => {
    // Database test
  });
});

skipIf(!hasRedis, it, "should cache data in Redis", async () => {
  // Redis test
});

// Skip flaky tests in CI
skipIf(isCI, it, "should handle timing-sensitive operations", async () => {
  // Test that might be flaky in CI due to timing
});

// Skip tests requiring manual setup
skipIf(!hasS3Access, describe, "S3 file upload tests", () => {
  it("should upload file to S3", async () => {
    // S3 upload test
  });
});

// Conditional test suites for different environments
if (isLocal) {
  describe("Local development tests", () => {
    it("should use development configuration", () => {
      // Development-specific tests
    });
  });
}

if (isCI) {
  describe("CI-specific tests", () => {
    it("should use production-like configuration", () => {
      // CI-specific tests
    });
  });
}

// Platform-specific tests
const testsByPlatform = {
  linux: () => {
    it("should handle Linux-specific features", () => {
      // Linux test
    });
  },
  darwin: () => {
    it("should handle macOS-specific features", () => {
      // macOS test
    });
  },
  win32: () => {
    it("should handle Windows-specific features", () => {
      // Windows test
    });
  }
};

const currentPlatform = process.platform as keyof typeof testsByPlatform;
if (testsByPlatform[currentPlatform]) {
  describe(`${currentPlatform} platform tests`, testsByPlatform[currentPlatform]);
}

// Version-based skipping
const nodeVersion = parseInt(process.version.slice(1));
skipIf(nodeVersion < 16, it, "should use Node 16+ features", () => {
  // Modern Node.js features
});

// Memory and performance tests
const hasEnoughMemory = process.env.MEMORY_TEST === "true";
skipIf(!hasEnoughMemory, it, "should handle large datasets", () => {
  // Memory-intensive test
});

// Integration with test frameworks
describe("Conditional test examples", () => {
  // Standard test
  it("should always run", () => {
    expect(true).to.be.true();
  });

  // Conditionally skipped test
  skipIf(
    process.env.SKIP_SLOW_TESTS === "true",
    it,
    "should complete slow operation",
    async function() {
      this.timeout(30000); // 30 second timeout
      // Slow test implementation
    }
  );

  // Travis-specific skip
  skipOnTravis(it, "should work with external dependencies", () => {
    // Test that doesn't work well on Travis
  });
});