dotstar/test/dotstar.spec.ts

Library to control Adafruit DotStar LED strip

import * as dotstar from '../dist/dotstar';

let dotstar1: dotstar.Dotstar;
let spi: dotstar.ISpi;
let spiWriteSpy: jasmine.Spy;

describe('dotstar', function () {
  beforeEach(() => {
    spi = <dotstar.ISpi>jasmine.createSpyObj("spiMock", ["write"]);
    spiWriteSpy = <jasmine.Spy>spi.write;
    dotstar1 = new dotstar.Dotstar(spi, { length: 2 });
  });
  
  it('turns off all LEDs when initialized', function () {
    // Arrange
    const expectedBuffer = new Buffer([0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF]);
    
    // Act
    
    // Assert
    const actualBuffer = spiWriteSpy.calls.mostRecent().args[0];
    expect(actualBuffer.equals(expectedBuffer)).toBe(true);
  });
  
  describe('all', function () {
    it('all() does not update the LED strip only sets the memory for the next sync', function () {
      // Arrange
      // Act
      dotstar1.all(255, 255, 255, 1);
      
      // Assert
      expect(spiWriteSpy.calls.count()).toEqual(1);
    });
    
    it('all() sets each LED to the specified RGBA color', function () {
      // Arrange
      const expectedBuffer = new Buffer([0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]);
      
      // Act
      dotstar1.all(255, 255, 255, 1);
      dotstar1.sync();
      
      // Assert
      const actualBuffer = spiWriteSpy.calls.mostRecent().args[0];
      expect(actualBuffer.equals(expectedBuffer)).toBe(true);
    });
  });
  
  describe('set', function () {
    it('all() does not update the LED strip only sets the memory for the next sync', function () {
      // Arrange
      
      // Act
      dotstar1.set(1, 255, 255, 255, 1);
      
      // Assert
      expect(spiWriteSpy.calls.count()).toEqual(1);
    });
    
    it('set() sets the LED at index to the specified RGBA color', function () {
      // Arrange
      const expectedBuffer = new Buffer([0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]);
      
      // Act
      dotstar1.set(1, 255, 255, 255, 1);
      dotstar1.sync();
      
      // Assert
      const actualBuffer = spiWriteSpy.calls.mostRecent().args[0];
      expect(actualBuffer.equals(expectedBuffer)).toBe(true);
    });
  });
  
  describe('clear', function () {
    it('clear() does not update the LED strip only sets the memory for the next sync', function () {
      // Arrange
      
      // Act
      dotstar1.clear();
      
      // Assert
      expect(spiWriteSpy.calls.count()).toEqual(1);
    });
    
    it('clear() sets all the LED colors to ', function () {
      // Arrange
      const expectedBuffer = new Buffer([0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF]);

      // Act
      dotstar1.all(255, 255, 255, 1);
      dotstar1.clear();
      dotstar1.sync();
      
      // Assert
      const actualBuffer = spiWriteSpy.calls.mostRecent().args[0];
      expect(actualBuffer.equals(expectedBuffer)).toBe(true);
    });
  });
  
  describe('sync', function () {
    it('sync() call the internal device.write', function () {
      // Arrange
      
      // Act
      dotstar1.sync();
      dotstar1.sync();
      
      // Assert
      expect(spiWriteSpy.calls.count()).toEqual(3);
    });
  })
});