Add tests for existing vm.renameSprite functionality

test/unit/virtual-machine.js

@@ -0,0 +1,51 @@
+var test = require('tap').test;
+var VirtualMachine = require('../../src/virtual-machine.js');
+
+test('renameSprite throws when there is no sprite with that id', function (t) {
+    var vm = new VirtualMachine();
+    vm.runtime.getTargetById = () => null;
+    t.throws(
+        (() => vm.renameSprite('id', 'name')),
+        new Error('No target with the provided id.')
+    );
+    t.end();
+});
+
+test('renameSprite throws when used on a non-sprite target', function (t) {
+    var vm = new VirtualMachine();
+    var fakeTarget = {
+        isSprite: () => false
+    };
+    vm.runtime.getTargetById = () => (fakeTarget);
+    t.throws(
+        (() => vm.renameSprite('id', 'name')),
+        new Error('Cannot rename non-sprite targets.')
+    );
+    t.end();
+});
+
+test('renameSprite throws when there is no sprite for given target', function (t) {
+    var vm = new VirtualMachine();
+    var fakeTarget = {
+        sprite: null,
+        isSprite: () => true
+    };
+    vm.runtime.getTargetById = () => (fakeTarget);
+    t.throws(
+        (() => vm.renameSprite('id', 'name')),
+        new Error('No sprite associated with this target.')
+    );
+    t.end();
+});
+
+test('renameSprite sets the sprite name', function (t) {
+    var vm = new VirtualMachine();
+    var fakeTarget = {
+        sprite: {name: 'original'},
+        isSprite: () => true
+    };
+    vm.runtime.getTargetById = () => (fakeTarget);
+    vm.renameSprite('id', 'not-original');
+    t.equal(fakeTarget.sprite.name, 'not-original');
+    t.end();
+});