test(logger): simplify unit tests structure (#2942)

Author: dreamorosi

packages/logger/jest.config.cjs

@@ -26,5 +26,5 @@ module.exports = {
     },
   },
   coverageReporters: ['json-summary', 'text', 'lcov'],
-  setupFiles: ['<rootDir>/tests/helpers/populateEnvironmentVariables.ts'],
+  setupFiles: ['<rootDir>/tests/helpers/setupEnv.ts'],
 };

packages/logger/src/constants.ts

@@ -24,4 +24,17 @@ const LogLevel = {
   CRITICAL: 'CRITICAL',
 } as const;
 
-export { LogJsonIndent, LogLevel };
+/**
+ * Numeric values for each log level.
+ */
+const LogLevelThreshold = {
+  TRACE: 6,
+  DEBUG: 8,
+  INFO: 12,
+  WARN: 16,
+  ERROR: 20,
+  CRITICAL: 24,
+  SILENT: 28,
+} as const;
+
+export { LogJsonIndent, LogLevel, LogLevelThreshold };

packages/logger/src/index.ts

@@ -1,4 +1,4 @@
 export { Logger } from './Logger.js';
 export { LogFormatter } from './formatter/LogFormatter.js';
 export { LogItem } from './formatter/LogItem.js';
-export { LogLevel } from './constants.js';
+export { LogLevel, LogLevelThreshold } from './constants.js';

packages/logger/tests/helpers/populateEnvironmentVariables.ts

@@ -0,0 +1,52 @@
+// Reserved variables
+process.env._X_AMZN_TRACE_ID =
+  'Root=1-5759e988-bd862e3fe1be46a994272793;Parent=557abcec3ee5a047;Sampled=1';
+process.env.AWS_LAMBDA_FUNCTION_NAME = 'my-lambda-function';
+process.env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE = '128';
+process.env.AWS_LAMBDA_FUNCTION_VERSION = '$LATEST';
+if (
+  process.env.AWS_REGION === undefined &&
+  process.env.CDK_DEFAULT_REGION === undefined
+) {
+  process.env.AWS_REGION = 'eu-west-1';
+}
+
+// Powertools for AWS Lambda (TypeScript) variables
+process.env.POWERTOOLS_LOG_LEVEL = 'DEBUG';
+process.env.POWERTOOLS_SERVICE_NAME = 'hello-world';
+
+jest.spyOn(console, 'error').mockImplementation();
+jest.spyOn(console, 'warn').mockImplementation();
+jest.spyOn(console, 'info').mockImplementation();
+jest.spyOn(console, 'debug').mockImplementation();
+jest.spyOn(console, 'log').mockImplementation();
+
+jest.mock('node:console', () => ({
+  ...jest.requireActual('node:console'),
+  Console: jest.fn().mockImplementation(() => ({
+    log: jest.fn(),
+    debug: jest.fn(),
+    info: jest.fn(),
+    warn: jest.fn(),
+    error: jest.fn(),
+  })),
+}));
+
+declare global {
+  namespace NodeJS {
+    interface ProcessEnv {
+      _X_AMZN_TRACE_ID: string | undefined;
+      AWS_LAMBDA_FUNCTION_NAME: string | undefined;
+      AWS_LAMBDA_FUNCTION_MEMORY_SIZE: string | undefined;
+      AWS_LAMBDA_FUNCTION_VERSION: string | undefined;
+      AWS_REGION: string | undefined;
+      CDK_DEFAULT_REGION: string | undefined;
+      POWERTOOLS_LOG_LEVEL: string | undefined;
+      POWERTOOLS_SERVICE_NAME: string | undefined;
+      POWERTOOLS_DEV: string | undefined;
+      POWERTOOLS_LOGGER_LOG_EVENT: string | undefined;
+    }
+  }
+}
+
+export type {};