1 files changed, 44 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/process-getter-test-instance-processor.js b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/process-getter-test-instance-processor.js
new file mode 100644
index 0000000000..b1434f54ba
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/process-getter-test-instance-processor.js
@@ -0,0 +1,44 @@
+/**
+ * @class ProcessGetterTestInstanceProcessor
+ * @extends AudioWorkletProcessor
+ *
+ * This processor class tests that a 'process' getter on an
+ * AudioWorkletProcessorConstructor instance is called at the right times.
+ */
+
+class ProcessGetterTestInstanceProcessor extends AudioWorkletProcessor {
+  constructor() {
+    super();
+    this.getterCallCount = 0;
+    this.totalProcessCallCount = 0;
+    Object.defineProperty(this, 'process', { get: function() {
+      if (!(this instanceof ProcessGetterTestInstanceProcessor)) {
+        throw new Error('`process` getter called with bad `this`.');
+      }
+      ++this.getterCallCount;
+      let functionCallCount = 0;
+      return () => {
+        if (++functionCallCount > 1) {
+          const message = 'Closure of function returned from `process` getter' +
+              ' should be used for only one call.'
+          this.port.postMessage({message: message});
+          throw new Error(message);
+        }
+        if (++this.totalProcessCallCount < 2) {
+          return true; // Expect another getter call.
+        }
+        if (this.totalProcessCallCount != this.getterCallCount) {
+          const message =
+              'Getter should be called only once for each process() call.'
+          this.port.postMessage({message: message});
+          throw new Error(message);
+        }
+        this.port.postMessage({message: 'done'});
+        return false; // No more calls required.
+      };
+    }});
+  }
+}
+
+registerProcessor('process-getter-test-instance',
+                  ProcessGetterTestInstanceProcessor);