added test suite for physicsEngineComponents.ts

tests/unit/babylon/src/Physics/babylon.physicsComponents.tests.ts

@@ -0,0 +1,210 @@
+
+// 'physicsEngineComponents.ts' injects methods and properties into Scene and AbstractMesh
+// these tests only check that Scene and AbstractMesh have the expected methods.
+
+
+/**
+ * Describes the test suite.
+ */
+describe('Babylon physicsComponents', () => {
+    let engine: BABYLON.Engine;
+    let scene: BABYLON.Scene;
+    let gravityVector: BABYLON.Vector3;
+    let noGravityVector: BABYLON.Vector3;
+    let physicsPlugin: BABYLON.AmmoJSPlugin;     // only testing Ammo for now
+
+    /**
+     * Loads the dependencies.
+     */
+    before(function(done) {
+        this.timeout(180000);
+
+        (BABYLONDEVTOOLS).Loader
+            .useDist()
+            .testMode()
+            .load(function() {
+                // Force apply promise polyfill for consistent behavior between chrome headless, IE11, and other browsers.
+                BABYLON.PromisePolyfill.Apply(true);
+                done();
+            });
+    });
+
+    /**
+     * Create a new engine and scene before each test.
+     */
+    beforeEach(function(done) {
+        engine = new BABYLON.NullEngine({
+            renderHeight: 256,
+            renderWidth: 256,
+            textureSize: 256,
+            deterministicLockstep: false,
+            lockstepMaxSteps: 1
+        });
+        scene = new BABYLON.Scene(engine);
+
+        gravityVector = new BABYLON.Vector3(0, -9.81, 0);
+        noGravityVector = BABYLON.Vector3.Zero();
+        physicsPlugin = new BABYLON.AmmoJSPlugin();     // only testing Ammo for now
+
+        done();
+    });
+
+
+    describe('#exercise the functions "physicsEngineComponents"', () => {
+
+        it('enables and disables the scene\'s physics engine', () => {
+
+            // scene starts off without a physics engine
+            let physicsEngine = scene.getPhysicsEngine();
+            expect(physicsEngine).to.be.undefined;
+
+            // specify an engine, and ask again
+            scene.enablePhysics(gravityVector, physicsPlugin);
+            physicsEngine = scene.getPhysicsEngine();
+            expect(physicsEngine).to.be.an('object');  // an iPhysicsEngine
+
+            // good, we have an plugin plugged in.  let's ask for it's name
+            let name = physicsEngine.getPhysicsPluginName();
+            expect(name).to.equal('AmmoJSPlugin');
+
+            // we can get the entire plugin back, which should be identical to physicsPlugin
+            let myPhysicsPlugin = physicsEngine.getPhysicsPlugin();
+            expect(myPhysicsPlugin).to.be.an('object');     // an iPhysicsEnginePlugin
+            expect(myPhysicsPlugin.name).to.equal('AmmoJSPlugin');
+
+            // disable the scene physicsEngine, and see whether still there
+            scene.disablePhysicsEngine();
+            physicsEngine = scene.getPhysicsEngine();
+            expect(physicsEngine).to.be.null; // note that physicsEngine is now null, not undefined
+
+        });
+
+        it('set and get timestep parameters', () => {
+
+            expect(scene.isPhysicsEnabled()).to.be.false;
+            scene.enablePhysics(gravityVector, physicsPlugin);
+            expect(scene.isPhysicsEnabled()).to.be.true;
+
+            // quick test to see if our physicsPlugin is really an  IPhysicsEnginePlugin
+            let timestep = physicsPlugin.getTimeStep();
+            expect(timestep).to.be.a('number');
+            expect(timestep).to.be.closeTo(1 / 60, 0.0001);      // default is 1/60th of a second
+
+            // let's slow down the timestep to 1/30
+            physicsPlugin.setTimeStep(1 / 30);
+            timestep = physicsPlugin.getTimeStep();
+            expect(timestep).to.be.closeTo(1 / 30, 0.0001);
+
+        });
+
+        it('sets up and disposes of an imposter on a mesh', () => {
+
+            scene.enablePhysics(gravityVector, physicsPlugin);
+
+            // The built-in 'sphere' shape. Params: name, subdivs, size, scene
+            let sphere = BABYLON.Mesh.CreateSphere("sphere1", 16, 2, scene);
+
+            sphere.physicsImpostor = new BABYLON.PhysicsImpostor(sphere, BABYLON.PhysicsImpostor.SphereImpostor, { mass: 1, restitution: 0.9 }, scene);
+            expect(sphere.physicsImpostor).to.be.an('object');
+
+            let sphereMass = sphere.physicsImpostor.mass;
+            expect(sphereMass).to.equal(1);   // no surprise, we created it with mass: 1
+
+            // make sure it has a unique ID
+            expect(sphere.physicsImpostor.uniqueId).to.be.a('number');
+
+            // if we create another sphere, it should have a different ID
+            let sphere2 = BABYLON.Mesh.CreateSphere("sphere2", 16, 2, scene);
+            sphere2.physicsImpostor = new BABYLON.PhysicsImpostor(sphere, BABYLON.PhysicsImpostor.SphereImpostor, { mass: 1, restitution: 0.9 }, scene);
+
+            expect(sphere.physicsImpostor.uniqueId).to.not.equal(sphere2.physicsImpostor.uniqueId);
+        });
+
+    });
+
+    // test 'Scene.onBeforePhysicsObservable' and 'Scene.onAfterPhysicsObservable' callbacks
+    describe('observables should fire before and after', function() {
+
+        var obWasCalled = false;
+
+        // only going to test onBefore for now
+        it('onBefore should trigger as soon as I animate', function(done) {
+
+            scene.enablePhysics(gravityVector, physicsPlugin);
+
+            scene.onBeforePhysicsObservable.add(function(observer: any) {
+                expect(obWasCalled).to.be.false;
+                obWasCalled = true;
+                done();
+            });
+
+            expect(obWasCalled).to.be.false;
+            scene.animate();   // rather than call hidden  _advancePhysicsEngineStep
+            expect(obWasCalled).to.be.true;
+        });
+    });
+
+
+    // previous tests were on injected properties of Scene.
+    // now test 'applyImpulse' which is an injected property of AbstractMesh
+    describe('applyImpulse should move a mesh', function() {
+
+        it('should move if an impulse is applied', function() {
+
+            scene.enablePhysics(noGravityVector, physicsPlugin);   // NO gravity
+            let getGravity = scene.getPhysicsEngine().gravity;
+            expect(getGravity).to.deep.equal(BABYLON.Vector3.Zero());
+
+            let sphere = BABYLON.MeshBuilder.CreateSphere("mySphere", { diameter: 1 }, scene);  // use MeshBuilder instead of Mesh
+            sphere.physicsImpostor = new BABYLON.PhysicsImpostor(sphere, BABYLON.PhysicsImpostor.SphereImpostor, { mass: 1, restitution: 0.9 }, scene);
+
+            let getPosition = sphere.position;
+            expect(getPosition).to.deep.equal(BABYLON.Vector3.Zero());
+
+            let linearVelocity = sphere.physicsImpostor.getLinearVelocity();
+            expect(linearVelocity).to.deep.equal(BABYLON.Vector3.Zero());
+
+            let angularVelocity = sphere.physicsImpostor.getAngularVelocity();
+            expect(linearVelocity).to.deep.equal(BABYLON.Vector3.Zero());
+
+            //////////////////////////////`/////////////////////
+            // so far, so good.  let's run the physics engine.  nothing should change.
+
+            scene.animate();
+
+            getPosition = sphere.position;
+            expect(getPosition).to.deep.equal(BABYLON.Vector3.Zero());
+
+            linearVelocity = sphere.physicsImpostor.getLinearVelocity();
+            expect(linearVelocity).to.deep.equal(BABYLON.Vector3.Zero());
+
+            angularVelocity = sphere.physicsImpostor.getAngularVelocity();
+            expect(linearVelocity).to.deep.equal(BABYLON.Vector3.Zero());
+
+            ///////////////////////////////////////////////////
+            // now give an impulse, and run the physics engine again.  the sphere should start moving.
+
+            let force = new BABYLON.Vector3(10, 0, 0);
+            let contact = new BABYLON.Vector3(-1, 0, 0);  // we know sphere has diameter 1.  so kick straight down x axis.
+            sphere.applyImpulse(force, contact);  // give the sphere its kick
+            scene.animate();   // and run the physics engine
+
+            getPosition = sphere.position;
+            expect(getPosition.x).to.be.greaterThan(0);   // moved about 0.01, I'm clueless how that was calculated
+            expect(getPosition.y).to.be.equal(0);
+            expect(getPosition.z).to.be.equal(0);
+
+            linearVelocity = sphere.physicsImpostor.getLinearVelocity();
+            expect(linearVelocity.x).to.be.closeTo(10, 0.001);      // mass of 1, whack of 10, sounds right
+            expect(linearVelocity.y).to.be.equal(0);
+            expect(linearVelocity.z).to.be.equal(0);
+
+            // we whacked it right along the axis, so don't expect any angular velocity
+            angularVelocity = sphere.physicsImpostor.getAngularVelocity()
+            console.log(angularVelocity);
+            expect(angularVelocity).to.deep.equal(BABYLON.Vector3.Zero());
+
+        });
+    });
+
+})

tests/unit/karma.conf.js

@@ -12,6 +12,8 @@ module.exports = function(config) {
         frameworks: ['mocha', 'chai', 'sinon'],
 
         files: [
+            { pattern: 'dist/ammo.js', watched: false },    // need ammo for physics test
+
             '!./**/*.d.ts',
             './Tools/DevLoader/BabylonLoader.js',
             './tests/unit/babylon/babylon.example.tests.js',
@@ -29,6 +31,7 @@ module.exports = function(config) {
             './tests/unit/babylon/src/Meshes/babylon.geometry.tests.js',
             './tests/unit/babylon/src/Meshes/babylon.mesh.vertexData.tests.js',
             './tests/unit/babylon/src/Misc/babylon.promise.tests.js',
+            './tests/unit/babylon/src/Physics/babylon.physicsComponents.tests.js',
             { pattern: 'dist/preview release/**/*.js', watched: false, included: false, served: true },
             { pattern: 'assets/**/*', watched: false, included: false, served: true },
             //{ pattern: 'tests/**/*', watched: false, included: false, served: true },