add Effect tests and mocks

package.json

@@ -24,8 +24,7 @@
   "dependencies": {
     "audio-context": "1.0.1",
     "minilog": "^3.0.1",
-    "startaudiocontext": "1.2.1",
+    "startaudiocontext": "1.2.1"
-    "tap": "^12.0.1"
   },
   "devDependencies": {
     "babel-core": "^6.24.1",
@@ -37,6 +36,7 @@
     "json": "^9.0.6",
     "travis-after-all": "^1.4.4",
     "webpack": "^4.8.0",
-    "webpack-cli": "^2.0.15"
+    "webpack-cli": "^2.0.15",
+    "tap": "^12.0.1"
   }
 }

test/__mocks__/AudioContext.js

@@ -0,0 +1,20 @@
+const AudioNodeMock = require('./AudioNode');
+const AudioParamMock = require('./AudioParam');
+
+class AudioContextMock {
+    createGain () {
+        return new AudioNodeMock({
+            gain: new AudioParamMock({
+                default: 1,
+                min: -3,
+                max: 3
+            })
+        });
+    }
+
+    createChannelMerger () {
+        return new AudioNodeMock();
+    }
+}
+
+module.exports = AudioContextMock;

test/__mocks__/AudioEngine.js

@@ -0,0 +1,12 @@
+const AudioContextMock = require('./AudioContext');
+const AudioTargetMock = require('./AudioTarget');
+
+class AudioEngineMock extends AudioTargetMock {
+    constructor () {
+        super();
+
+        this.audioContext = new AudioContextMock();
+    }
+}
+
+module.exports = AudioEngineMock;

test/__mocks__/AudioNode.js

@@ -0,0 +1,36 @@
+class AudioNodeMock {
+    constructor (params) {
+        Object.assign(this, params);
+
+        this.connected = null;
+        this.connectedFrom = [];
+        this._testResult = [];
+    }
+
+    connect (node) {
+        this.connected = node;
+        node.connectedFrom.push(this);
+    }
+
+    disconnect () {
+        if (this.connected !== null) {
+            this.connectedFrom = this.connectedFrom.filter(connection => connection !== this);
+        }
+        this.connected = null;
+    }
+
+    _test (test, message, depth = 0) {
+        if (this.connected === null) {
+            this._testResult.push({test, message, depth});
+        } else {
+            this.connected._test(test, message, depth + 1);
+            this._testResult.push(null);
+        }
+    }
+
+    _result () {
+        return this._testResult.pop();
+    }
+}
+
+module.exports = AudioNodeMock;

test/__mocks__/AudioParam.js

@@ -0,0 +1,7 @@
+class AudioParamMock {
+    setTargetAtTime (value /* , start, stop */) {
+        this.value = value;
+    }
+}
+
+module.exports = AudioParamMock;

test/__mocks__/AudioTarget.js

@@ -0,0 +1,21 @@
+const AudioNodeMock = require('./AudioNode');
+
+class AudioTargetMock {
+    constructor () {
+        this.inputNode = new AudioNodeMock();
+    }
+
+    connect (target) {
+        this.inputNode.connect(target.getInputNode());
+    }
+
+    getInputNode () {
+        return this.inputNode;
+    }
+
+    getSoundPlayers () {
+        return {};
+    }
+}
+
+module.exports = AudioTargetMock;

test/effects/EffectShape.js

@@ -0,0 +1,115 @@
+const tap = require('tap');
+
+const PanEffect = require('../../src/effects/PanEffect');
+const PitchEffect = require('../../src/effects/PitchEffect');
+const VolumeEffect = require('../../src/effects/VolumeEffect');
+
+const AudioEngine = require('../__mocks__/AudioEngine');
+const AudioTarget = require('../__mocks__/AudioTarget');
+
+const testEffect = (EffectClass, effectDepth) => {
+    tap.test(EffectClass.name, t1 => {
+        t1.plan(3);
+
+        t1.test('methods', t2 => {
+            t2.plan(7);
+
+            t2.ok(
+                'DEFAULT_VALUE' in EffectClass.prototype,
+                'has DEFAULT_VALUE'
+            );
+            t2.type(EffectClass.prototype.initialize, 'function', 'has initialize');
+            t2.type(EffectClass.prototype.set, 'function', 'has set');
+            t2.type(EffectClass.prototype.update, 'function', 'has update');
+            t2.type(EffectClass.prototype.clear, 'function', 'has clear');
+            t2.type(EffectClass.prototype.connect, 'function', 'has connect');
+            t2.type(EffectClass.prototype.dispose, 'function', 'has dispose');
+
+            t2.end();
+        });
+
+        t1.test('connect', t2 => {
+            t2.plan(6);
+
+            const engine = new AudioEngine();
+            const target = new AudioTarget();
+            let effect = new EffectClass(engine, target, null);
+
+            target.inputNode._test('stall', 'message does not move');
+            t2.equal(target.inputNode._result().depth, 0, 'message not sent');
+            t2.ok(!engine.inputNode._result(), 'message not received');
+            t2.ok(!engine.inputNode.connected, 'engine not connected');
+
+            effect.dispose();
+            effect = new EffectClass(engine, target, null);
+            const effect2 = new EffectClass(engine, target, effect);
+            effect2.connect(engine);
+            effect.connect(effect2);
+
+            target.inputNode._test('move', 'message does move');
+            t2.ok(!target.inputNode._result(), 'message sent');
+            t2.equal(engine.inputNode._result().depth, 1, 'message received');
+            t2.ok(engine.inputNode.connectedFrom.length, 'engine connected');
+
+            t2.end();
+        });
+
+        t1.test('lifecycle', t2 => {
+            t2.plan(18);
+
+            const engine = new AudioEngine();
+            const target = new AudioTarget();
+            let effect = new EffectClass(engine, target, null);
+            let effect2 = new EffectClass(engine, target, effect);
+
+            target.inputNode._test('stall', 'message does not move');
+            t2.equal(target.inputNode._result().depth, 0, 'message not sent');
+            t2.ok(!engine.inputNode._result(), 'message not received');
+            t2.ok(!engine.inputNode.connected, 'engine not connected');
+
+            effect2.connect(engine);
+            effect.connect(effect2);
+
+            target.inputNode._test('move', 'message does move');
+            t2.ok(!target.inputNode._result(), 'message sent');
+            t2.equal(engine.inputNode._result().depth, 1, 'message received');
+            t2.ok(engine.inputNode.connectedFrom.length, 'engine connected');
+
+            effect.set(effect.DEFAULT_VALUE - 1);
+
+            target.inputNode._test('move', 'message does move');
+            t2.ok(!target.inputNode._result(), 'message sent');
+            t2.equal(engine.inputNode._result().depth, 1 + effectDepth, 'message received');
+            t2.ok(engine.inputNode.connectedFrom.length, 'engine connected');
+
+            effect2.set(effect2.DEFAULT_VALUE - 1);
+
+            target.inputNode._test('move', 'message does move');
+            t2.ok(!target.inputNode._result(), 'message sent');
+            t2.equal(engine.inputNode._result().depth, 1 + (2 * effectDepth), 'message received');
+            t2.ok(engine.inputNode.connectedFrom.length, 'engine connected');
+
+            effect.clear();
+
+            target.inputNode._test('move', 'message does move');
+            t2.ok(!target.inputNode._result(), 'message sent');
+            t2.equal(engine.inputNode._result().depth, 1 + effectDepth, 'message received');
+            t2.ok(engine.inputNode.connectedFrom.length, 'engine connected');
+
+            effect2.clear();
+
+            target.inputNode._test('move', 'message does move');
+            t2.ok(!target.inputNode._result(), 'message sent');
+            t2.equal(engine.inputNode._result().depth, 1, 'message received');
+            t2.ok(engine.inputNode.connectedFrom.length, 'engine connected');
+
+            t2.end();
+        });
+
+        t1.end();
+    });
+};
+
+testEffect(PanEffect, 3);
+testEffect(PitchEffect, 0);
+testEffect(VolumeEffect, 1);