[tests] Fix bogus uses of assertThrows.

test/mjsunit/mjsunit.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 75 matching lines @@
 // Checks that the found value is *not* null.
 var assertNotNull;
 
 // Assert that the passed function or eval code throws an exception.
 // The optional second argument is an exception constructor that the
 // thrown exception is checked against with "instanceof".
 // The optional third argument is a message type string that is compared
 // to the type property on the thrown exception.
 var assertThrows;
 
+// Assert that the passed function throws an exception.
+// The exception is checked against the second argument using assertEquals.
+var assertThrowsEquals;
+
 // Assert that the passed function or eval code does not throw an exception.
 var assertDoesNotThrow;
 
 // Asserts that the found value is an instance of the constructor passed
 // as the second argument.
 var assertInstanceof;
 
 // Assert that this code is never executed (i.e., always fails if executed).
 var assertUnreachable;
 
@@ skipping 240 matching lines @@
     try {
       if (typeof code === 'function') {
         code();
       } else {
         eval(code);
       }
       threwException = false;
     } catch (e) {
       if (typeof type_opt === 'function') {
         assertInstanceof(e, type_opt);
+      } else if (type_opt !== void 0) {
+        fail("invalid use of assertThrows, maybe you want assertThrowsEquals");
       }
       if (arguments.length >= 3) {
         assertEquals(e.type, cause_opt);
       }
       // Success.
       return;
     }
     throw new MjsUnitAssertionError("Did not throw exception");
   };
 
 
+  assertThrowsEquals = function assertThrowsEquals(fun, val) {
+    try {
+      fun();
+    } catch(e) {
+      assertEquals(val, e);
+      return;
+    }
+    throw new MjsUnitAssertionError("Did not throw exception");
+  };
+
+
   assertInstanceof = function assertInstanceof(obj, type) {
     if (!(obj instanceof type)) {
       var actualTypeName = null;
       var actualConstructor = Object.getPrototypeOf(obj).constructor;
       if (typeof actualConstructor === "function") {
         actualTypeName = actualConstructor.name || String(actualConstructor);
       }
       fail("Object <" + PrettyPrint(obj) + "> is not an instance of <" +
                (type.name || type) + ">" +
                (actualTypeName ? " but of < " + actualTypeName + ">" : ""));
@@ skipping 40 matching lines @@
     if (sync_opt === undefined) sync_opt = "";
     assertTrue(OptimizationStatus(fun, sync_opt) !== 1, name_opt);
   }
 
   assertOptimized = function assertOptimized(fun, sync_opt, name_opt) {
     if (sync_opt === undefined) sync_opt = "";
     assertTrue(OptimizationStatus(fun, sync_opt) !== 2, name_opt);
   }
 
 })();