add class tests to optional async transformers

test/fixtures/transformation/async-to-generator/async/actual.js

@@ -0,0 +1,5 @@
+class Foo {
+  async foo() {
+    var wat = await bar();
+  }
+}

test/fixtures/transformation/async-to-generator/async/expected.js

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+"use strict";
+
+var _asyncToGenerator = function (fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { var callNext = step.bind(gen.next); var callThrow = step.bind(gen["throw"]); function step(arg) { try { var info = this(arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(callNext, callThrow); } } callNext(); }); }; };
+
+var _prototypeProperties = function (child, staticProps, instanceProps) { if (staticProps) Object.defineProperties(child, staticProps); if (instanceProps) Object.defineProperties(child.prototype, instanceProps); };
+
+var Foo = (function () {
+  function Foo() {}
+
+  _prototypeProperties(Foo, null, {
+    foo: {
+      value: _asyncToGenerator(function* () {
+        var wat = yield bar();
+      }),
+      writable: true,
+      enumerable: true,
+      configurable: true
+    }
+  });
+
+  return Foo;
+})();

test/fixtures/transformation/bluebird-coroutines/class/actual.js

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+class Foo {
+  async foo() {
+    var wat = await bar();
+  }
+}

test/fixtures/transformation/bluebird-coroutines/class/expected.js

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+"use strict";
+
+var _bluebird = require("bluebird");
+
+var _prototypeProperties = function (child, staticProps, instanceProps) { if (staticProps) Object.defineProperties(child, staticProps); if (instanceProps) Object.defineProperties(child.prototype, instanceProps); };
+
+var Foo = (function () {
+  function Foo() {}
+
+  _prototypeProperties(Foo, null, {
+    foo: {
+      value: _bluebird.coroutine(function* () {
+        var wat = yield bar();
+      }),
+      writable: true,
+      enumerable: true,
+      configurable: true
+    }
+  });
+
+  return Foo;
+})();