Add unary operators with NewTarget test (#2199)

Author: shvaikalesh

test/language/expressions/new.target/unary-expr.js

@@ -0,0 +1,31 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: prod-UnaryExpression
+description: >
+  While increments and decrements are restricted to use with NewTarget,
+  other unary operators should not throw SyntaxError.
+info: |
+  UnaryExpression[Yield, Await]:
+    UpdateExpression[?Yield, ?Await]:
+      LeftHandSideExpression[?Yield, ?Await]:
+        NewExpression[?Yield, ?Await]:
+          MemberExpression[Yield, Await]:
+            MetaProperty:
+              NewTarget
+features: [new.target, async-functions]
+flags: [async]
+---*/
+
+(function() { assert.sameValue(delete (new.target), true); })();
+(function() { assert.sameValue(void new.target, undefined); })();
+new function() { assert.sameValue(typeof new.target, 'function'); };
+new function() { assert.sameValue(+(new.target), NaN); };
+(function() { assert.sameValue(-(new.target), NaN); })();
+new function() { assert.sameValue(~new.target, -1); };
+(function() { assert.sameValue(!new.target, true); })();
+new function() { assert.sameValue(delete void typeof +-~!(new.target), true); };
+
+(async function() {
+  assert.sameValue(await new.target, undefined);
+})().then($DONE, $DONE);