test: add test for broadcast and wait in warp mode

Author: Sanae6

test/fixtures/warped-broadcasts.sb3

@@ -0,0 +1,35 @@
+const path = require('path');
+const test = require('tap').test;
+const makeTestStorage = require('../fixtures/make-test-storage');
+const readFileToBuffer = require('../fixtures/readProjectFile').readFileToBuffer;
+const VirtualMachine = require('../../src/index');
+const Runtime = require('../../src/engine/runtime');
+
+const projectUri = path.resolve(__dirname, '../fixtures/warped-broadcasts.sb3');
+const project = readFileToBuffer(projectUri);
+
+test('broadcasts in warp procedures ', t => {
+    const vm = new VirtualMachine();
+    vm.attachStorage(makeTestStorage());
+
+    // Start VM, load project, and run
+    t.doesNotThrow(() => {
+        // Note: don't run vm.start(), we handle calling _step() manually in this test
+        vm.runtime.currentStepTime = Runtime.THREAD_STEP_INTERVAL;
+        vm.clear();
+        vm.setCompatibilityMode(false);
+        vm.setTurboMode(false);
+
+        vm.loadProject(project).then(() => {
+            t.equal(vm.runtime.threads.length, 0);
+            
+            vm.greenFlag();
+            t.equal(vm.runtime.threads.length, 1);
+            vm.runtime._step();
+            t.equal(vm.runtime.threads.length, 0);
+            t.equal(vm.runtime._lastStepDoneThreads.length, 2);
+
+            t.end();
+        });
+    });
+});