flow like the river

BACK_BACK/node_modules/@parcel/logger/test/logger.js

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+const assert = require('assert');
+const sinon = require('sinon');
+const Logger = require('../src/Logger');
+
+describe('Logger', () => {
+  let log;
+  beforeEach(function() {
+    log = [];
+  });
+
+  const stub = instance => {
+    sinon.stub(instance, '_log').callsFake(message => {
+      log.push(message);
+    });
+  };
+
+  it('should log message on write', () => {
+    const l = new Logger.constructor({});
+    stub(l);
+
+    l.write('hello');
+    assert.equal(log[0], 'hello');
+  });
+
+  it('should track number of lines on persist false', () => {
+    const l = new Logger.constructor({});
+    stub(l);
+
+    const count = l.lines;
+    l.write('hello\nworld', false);
+    assert.equal(l.lines, count + 2);
+  });
+
+  it('should not track number of lines on persist true', () => {
+    const l = new Logger.constructor({});
+    stub(l);
+
+    const count = l.lines;
+    l.write('hello\nworld', true);
+    assert.equal(l.lines, count);
+  });
+
+  it('should respect log levels', () => {
+    const l = new Logger.constructor({logLevel: 2, color: false});
+    stub(l);
+
+    l.log('message');
+    l.persistent('message');
+    l.progress('message');
+    l.logLevel = 1;
+    l.warn('message');
+    l.logLevel = 0;
+    l.error({message: 'message', stack: 'stack'});
+
+    assert.equal(log.length, 0);
+
+    l.logLevel = 1;
+    l.error({message: 'message', stack: 'stack'});
+    assert.equal(log.length, 2);
+
+    l.logLevel = 2;
+    l.warn('message');
+    assert.equal(log.length, 3);
+
+    l.logLevel = 3;
+    l.log('message');
+    l.persistent('message');
+    l.progress('message');
+    assert.equal(log.length, 5);
+  });
+
+  it('should handle lack of color support with alternatives', () => {
+    const l = new Logger.constructor({color: false});
+    stub(l);
+
+    // clear is a no-op
+    l.lines = 4;
+    l.clear();
+    assert.equal(l.lines, 4);
+  });
+
+  it('should reset on clear', () => {
+    const l = new Logger.constructor({color: true, isTest: false});
+    stub(l);
+
+    // stub readline so we don't actually clear the test output
+    const sandbox = sinon.createSandbox();
+    sandbox.stub(require('readline'));
+
+    l.lines = 10;
+    l.clear();
+
+    assert.equal(l.lines, 0);
+    sandbox.restore();
+  });
+
+  it('should use ora for progress', () => {
+    const l = new Logger.constructor({color: false});
+
+    l.progress('message');
+
+    assert(l.spinner);
+    assert(l.spinner.text.includes('message'));
+  });
+
+  it('should use internal _log function for writes', () => {
+    const l = new Logger.constructor({color: false});
+    const sandbox = sinon.createSandbox(); // use sandbox to silence console.log
+
+    let spy;
+    try {
+      spy = sandbox.spy(l, '_log');
+      sandbox.stub(console, 'log');
+
+      l.write('hello world');
+    } finally {
+      l._log.restore();
+      sandbox.restore();
+    }
+
+    assert(spy.called);
+  });
+});