test(utils/logger): adds tests for logger

test/utils/logger.test.ts

@@ -0,0 +1,83 @@
+/* eslint-disable no-console */
+import logger, { setLevel } from '~/utils/logger';
+import chalk from 'chalk';
+
+chalk.enabled = false;
+console.trace = jest.fn();
+console.info = jest.fn();
+console.warn = jest.fn();
+console.error = jest.fn();
+const mocks: { [key: string]: jest.Mock } = {
+  trace: console.trace,
+  info: console.info,
+  warn: console.warn,
+  error: console.error
+} as any;
+
+beforeEach(() => Object.values(mocks).forEach((mock) => mock.mockClear()));
+
+test(`has default level`, () => {
+  expect(logger.getLevel()).toBe(2);
+});
+test(`sets level`, () => {
+  expect(setLevel('debug')).toBeUndefined();
+  expect(logger.getLevel()).toBe(1);
+});
+test(`doesn't prefix over info`, () => {
+  setLevel('info');
+
+  logger.info('message');
+  logger.error('message');
+  logger.warn('message');
+  expect(mocks.info).toHaveBeenCalledTimes(1);
+  expect(mocks.info.mock.calls[0]).toMatchInlineSnapshot(`
+    Array [
+      "message",
+    ]
+  `);
+  expect(mocks.warn).toHaveBeenCalledTimes(1);
+  expect(mocks.warn.mock.calls[0]).toMatchInlineSnapshot(`
+    Array [
+      "WARN: message",
+    ]
+  `);
+  expect(mocks.error).toHaveBeenCalledTimes(1);
+  expect(mocks.error.mock.calls[0]).toMatchInlineSnapshot(`
+    Array [
+      "ERROR: message",
+    ]
+  `);
+});
+
+test(`doesn't prefixes under info`, () => {
+  setLevel('trace');
+
+  logger.trace('message');
+  logger.info('message');
+  logger.error('message');
+  logger.warn('message');
+  expect(mocks.trace).toHaveBeenCalledTimes(1);
+  expect(mocks.trace.mock.calls[0]).toMatchInlineSnapshot(`
+    Array [
+      "[TRACE] kpo: message",
+    ]
+  `);
+  expect(mocks.info).toHaveBeenCalledTimes(1);
+  expect(mocks.info.mock.calls[0]).toMatchInlineSnapshot(`
+    Array [
+      "[INFO] kpo: message",
+    ]
+  `);
+  expect(mocks.warn).toHaveBeenCalledTimes(1);
+  expect(mocks.warn.mock.calls[0]).toMatchInlineSnapshot(`
+    Array [
+      "[WARN] kpo: message",
+    ]
+  `);
+  expect(mocks.error).toHaveBeenCalledTimes(1);
+  expect(mocks.error.mock.calls[0]).toMatchInlineSnapshot(`
+    Array [
+      "[ERROR] kpo: message",
+    ]
+  `);
+});