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Testing Promise-Based Animation Execution in LearnGitBranching

This test suite validates the animation module functionality in LearnGitBranching, focusing on promise-based animations and closure execution. It ensures proper handling of animation callbacks and deferred promises in the visualization system.

Test Coverage Overview

The test suite covers core animation functionality with a focus on promise-based animations and closure execution.

Tests PromiseAnimation class instantiation and execution
Verifies closure callback functionality
Validates animation pack integration
Ensures proper state management during animation playback

Implementation Analysis

The testing approach uses Jest’s describe/it pattern to organize test cases logically. Tests implement straightforward value increment checks to verify animation execution.

Uses Q promises for deferred execution
Implements closure-based animation verification
Employs direct function callbacks for animation packs

Technical Details

Testing Framework: Jest
Promise Library: Q
Key Classes: PromiseAnimation, Animation
Test Environment: Node.js
Module System: CommonJS require()

Best Practices Demonstrated

The test suite demonstrates clean and focused test cases with clear assertions and setup. Each test validates a single aspect of the animation system.

Isolated test cases with clear purpose
Proper test setup and teardown
Straightforward value checking
Consistent testing patterns

pcottle/learngitbranching

__tests__/animation.spec.js

            
var AnimationModule = require('../src/js/visuals/animation/index');
var PromiseAnimation = AnimationModule.PromiseAnimation;
var Animation = AnimationModule.Animation;
var Q = require('q');

describe('Promise animation', function() {
  it('Will execute the closure', function() {
    var value = 0;
    var closure = function() {
      value++;
    };

    var animation = new PromiseAnimation({
      deferred: Q.defer(),
      closure: closure
    });
    animation.play();
    expect(value).toBe(1);
  });

  it('also takes animation packs', function() {
    var value = 0;
    var animation = new PromiseAnimation({
      animation: function() { value++; }
    });
    animation.play();
    expect(value).toBe(1);
  });
});