diff --git a/test/language/statements/function/13.0-17-s.js b/test/language/statements/function/13.0-17-s.js
index c269a7b24a..592a633899 100644
--- a/test/language/statements/function/13.0-17-s.js
+++ b/test/language/statements/function/13.0-17-s.js
@@ -11,12 +11,6 @@ description: >
     when a Function constructor is contained in strict mode code
     within eval code
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         eval("'use strict'; var _13_0_17_fun = new Function('eval = 42;'); _13_0_17_fun();");
-        return true;
-    }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.0-8-s.js b/test/language/statements/function/13.0-8-s.js
index ab970edc62..237812ae7b 100644
--- a/test/language/statements/function/13.0-8-s.js
+++ b/test/language/statements/function/13.0-8-s.js
@@ -10,19 +10,10 @@ description: >
     Strict Mode - SourceElements is evaluated as strict mode code when
     the code of this FunctionExpression is contained in non-strict
     mode but the call to eval is a direct call in strict mode code
-flags: [noStrict]
-includes: [runTestCase.js]
+flags: [onlyStrict]
 ---*/
 
-function testcase() {
-        "use strict";
-
-        try {
+assert.throws(SyntaxError, function() {
             eval("var _13_0_8_fun = function () {eval = 42;};");
             _13_0_8_fun();
-            return false;
-        } catch (e) {
-            return e instanceof SyntaxError;
-        }
-    }
-runTestCase(testcase);
+});
diff --git a/test/language/statements/function/13.1-1-1.js b/test/language/statements/function/13.1-1-1.js
index c634a7c39b..fe491ee044 100644
--- a/test/language/statements/function/13.1-1-1.js
+++ b/test/language/statements/function/13.1-1-1.js
@@ -6,17 +6,7 @@ es5id: 13.1-1-1
 description: >
     Duplicate identifier allowed in non-strict function declaration
     parameter list
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval('function foo(a,a){}');
-    return true;
-  }
-  catch (e) { return false }
-  }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-1-2.js b/test/language/statements/function/13.1-1-2.js
index 1fc7af5e71..0db6d3ba79 100644
--- a/test/language/statements/function/13.1-1-2.js
+++ b/test/language/statements/function/13.1-1-2.js
@@ -6,17 +6,7 @@ es5id: 13.1-1-2
 description: >
     Duplicate identifier allowed in non-strict function expression
     parameter list
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval('(function foo(a,a){})');
-    return true;
-  }
-  catch (e) { return false }
-  }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-2-1.js b/test/language/statements/function/13.1-2-1.js
index 58ed04fb3c..c517620a92 100644
--- a/test/language/statements/function/13.1-2-1.js
+++ b/test/language/statements/function/13.1-2-1.js
@@ -6,17 +6,7 @@ es5id: 13.1-2-1
 description: >
     eval allowed as formal parameter name of a non-strict function
     declaration
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval("function foo(eval){};");
-    return true;
-  }
-  catch (e) {  }
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-2-5.js b/test/language/statements/function/13.1-2-5.js
index 7f70415854..7d7f9cd00d 100644
--- a/test/language/statements/function/13.1-2-5.js
+++ b/test/language/statements/function/13.1-2-5.js
@@ -6,17 +6,7 @@ es5id: 13.1-2-5
 description: >
     arguments allowed as formal parameter name of a non-strict
     function declaration
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval("function foo(arguments){};");
-    return true;
-  }
-  catch (e) {  }
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-2-6.js b/test/language/statements/function/13.1-2-6.js
index c3436c7865..8db8bf9b22 100644
--- a/test/language/statements/function/13.1-2-6.js
+++ b/test/language/statements/function/13.1-2-6.js
@@ -6,13 +6,7 @@ es5id: 13.1-2-6
 description: >
     arguments allowed as formal parameter name of a non-strict
     function expression
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
     eval("(function foo(arguments){});");
-    return true;
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-3-1.js b/test/language/statements/function/13.1-3-1.js
index 10a8e46611..fa2f589833 100644
--- a/test/language/statements/function/13.1-3-1.js
+++ b/test/language/statements/function/13.1-3-1.js
@@ -6,17 +6,7 @@ es5id: 13.1-3-1
 description: >
     eval allowed as function identifier in non-strict function
     declaration
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval("function eval(){};");
-    return true;
-  }
-  catch (e) {  }  
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-3-2.js b/test/language/statements/function/13.1-3-2.js
index 80db21eb33..d3b2f6bf72 100644
--- a/test/language/statements/function/13.1-3-2.js
+++ b/test/language/statements/function/13.1-3-2.js
@@ -6,17 +6,7 @@ es5id: 13.1-3-2
 description: >
     eval allowed as function identifier in non-strict function
     expression
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval("(function eval(){});");
-    return true;
-  }
-  catch (e) {  }  
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-3-7.js b/test/language/statements/function/13.1-3-7.js
index c230719b84..e9445cfd80 100644
--- a/test/language/statements/function/13.1-3-7.js
+++ b/test/language/statements/function/13.1-3-7.js
@@ -6,17 +6,7 @@ es5id: 13.1-3-7
 description: >
     arguments allowed as function identifier in non-strict function
     declaration
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval("function arguments (){};");
-    return true;
-  }
-  catch (e) {  }  
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-3-8.js b/test/language/statements/function/13.1-3-8.js
index 5734df8e8c..6e2d9e0ba6 100644
--- a/test/language/statements/function/13.1-3-8.js
+++ b/test/language/statements/function/13.1-3-8.js
@@ -6,17 +6,7 @@ es5id: 13.1-3-8
 description: >
     arguments allowed as function identifier in non-strict function
     expression
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
-  try 
-  {
     eval("(function arguments (){});");
-    return true;
-  }
-  catch (e) {  }  
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-11-s.js b/test/language/statements/function/13.2-11-s.js
index 5fa605c3e9..4dd684fb47 100644
--- a/test/language/statements/function/13.2-11-s.js
+++ b/test/language/statements/function/13.2-11-s.js
@@ -6,17 +6,10 @@ es5id: 13.2-11-s
 description: >
     StrictMode - enumerating over a function object looking for
     'caller' fails outside of the function
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = Function("'use strict';");
         
         for (var tempIndex in foo) {
-            if (tempIndex === "caller") {
-                return false;
-            }
+            assert.notSameValue(tempIndex, "caller", 'tempIndex');
         }
-        return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-12-s.js b/test/language/statements/function/13.2-12-s.js
index 9c4f397cb6..f276fe4f19 100644
--- a/test/language/statements/function/13.2-12-s.js
+++ b/test/language/statements/function/13.2-12-s.js
@@ -6,11 +6,7 @@ es5id: 13.2-12-s
 description: >
     StrictMode - enumerating over a function object looking for
     'caller' fails inside the function
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-            var foo = Function("'use strict'; for (var tempIndex in this) {if (tempIndex===\"caller\") {return false;}}; return true;");
-            return foo.call(foo);
-}
-runTestCase(testcase);
+            var foo = Function("'use strict'; for (var tempIndex in this) {assert.notSameValue(tempIndex, 'caller', 'tempIndex');}");
+            foo.call(foo);
diff --git a/test/language/statements/function/13.2-15-s.js b/test/language/statements/function/13.2-15-s.js
index 1f46d30a0c..20b043739f 100644
--- a/test/language/statements/function/13.2-15-s.js
+++ b/test/language/statements/function/13.2-15-s.js
@@ -6,17 +6,10 @@ es5id: 13.2-15-s
 description: >
     StrictMode - enumerating over a function object looking for
     'arguments' fails outside of the function
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = new Function("'use strict';");
         
         for (var tempIndex in foo) {
-            if (tempIndex === "arguments") {
-                return false;
-            }
+            assert.notSameValue(tempIndex, "arguments", 'tempIndex');
         }
-        return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-16-s.js b/test/language/statements/function/13.2-16-s.js
index 159d49a763..acab7f68ed 100644
--- a/test/language/statements/function/13.2-16-s.js
+++ b/test/language/statements/function/13.2-16-s.js
@@ -6,11 +6,7 @@ es5id: 13.2-16-s
 description: >
     StrictMode - enumerating over a function object looking for
     'arguments' fails inside the function
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-            var foo = new Function("'use strict'; for (var tempIndex in this) {if (tempIndex===\"arguments\") {return false;}}; return true;");
-            return foo.call(foo);
-}
-runTestCase(testcase);
+            var foo = new Function("'use strict'; for (var tempIndex in this) {assert.notSameValue(tempIndex, 'arguments', 'tempIndex');}");
+            foo.call(foo);
diff --git a/test/language/statements/function/13.2-19-s.js b/test/language/statements/function/13.2-19-s.js
index 2f7f47642b..eacfa417e6 100644
--- a/test/language/statements/function/13.2-19-s.js
+++ b/test/language/statements/function/13.2-19-s.js
@@ -6,17 +6,10 @@ es5id: 13.2-19-s
 description: >
     StrictMode - enumerating over a function object looking for
     'arguments' fails outside of the function
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = Function("'use strict';");
         
         for (var tempIndex in foo) {
-            if (tempIndex === "arguments") {
-                return false;
-            }
+            assert.notSameValue(tempIndex, "arguments", 'tempIndex');
         }
-        return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-20-s.js b/test/language/statements/function/13.2-20-s.js
index f7d8d348a4..dac0750292 100644
--- a/test/language/statements/function/13.2-20-s.js
+++ b/test/language/statements/function/13.2-20-s.js
@@ -7,11 +7,7 @@ description: >
     StrictMode - enumerating over a function object looking for
     'arguments' fails inside the function
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-            var foo = Function("'use strict'; for (var tempIndex in this) {if (tempIndex===\"arguments\") {return false;}}; return true;");
-            return foo.call(foo);
-}
-runTestCase(testcase);
+            var foo = Function("'use strict'; for (var tempIndex in this) {assert.notSameValue(tempIndex, 'arguments', 'tempIndex');}");
+            foo.call(foo);
diff --git a/test/language/statements/function/13.2-23-s.js b/test/language/statements/function/13.2-23-s.js
index 7b0b971374..e9df08adf5 100644
--- a/test/language/statements/function/13.2-23-s.js
+++ b/test/language/statements/function/13.2-23-s.js
@@ -7,16 +7,9 @@ description: >
     StrictMode - enumerating over a function object looking for
     'caller' fails outside of the function
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         function foo () {"use strict";}
         for (var tempIndex in foo) {
-            if (tempIndex === "caller") {
-                return false;
-            }
+            assert.notSameValue(tempIndex, "caller", 'tempIndex');
         }
-        return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-24-s.js b/test/language/statements/function/13.2-24-s.js
index 58622c2638..b919eb8278 100644
--- a/test/language/statements/function/13.2-24-s.js
+++ b/test/language/statements/function/13.2-24-s.js
@@ -7,19 +7,13 @@ description: >
     StrictMode - enumerating over a function object looking for
     'caller' fails inside the function
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
             function foo () {
                 "use strict"; 
                 for (var tempIndex in this) {
-                    if (tempIndex==="caller") {
-                        return false;
-                    }
+                    assert.notSameValue(tempIndex, "caller", 'tempIndex');
                 } 
-                return true;
             }
-            return foo.call(foo);
-}
-runTestCase(testcase);
+
+foo.call(foo);
diff --git a/test/language/statements/function/13.2-27-s.js b/test/language/statements/function/13.2-27-s.js
index 742d5f4460..57080ca624 100644
--- a/test/language/statements/function/13.2-27-s.js
+++ b/test/language/statements/function/13.2-27-s.js
@@ -7,17 +7,10 @@ description: >
     StrictMode - enumerating over a function object looking for
     'arguments' fails outside of the function
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         function foo () {"use strict";}
         
         for (var tempIndex in foo) {
-            if (tempIndex === "arguments") {
-                return false;
-            }
+            assert.notSameValue(tempIndex, "arguments", 'tempIndex');
         }
-        return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-28-s.js b/test/language/statements/function/13.2-28-s.js
index af65268a80..156fbb7ea5 100644
--- a/test/language/statements/function/13.2-28-s.js
+++ b/test/language/statements/function/13.2-28-s.js
@@ -7,19 +7,12 @@ description: >
     StrictMode - enumerating over a function object looking for
     'arguments' fails inside the function
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
             function foo() {
                 "use strict"; 
                 for (var tempIndex in this) {
-                    if (tempIndex==="arguments") {
-                        return false;
-                    }
+                    assert.notSameValue(tempIndex, "arguments", 'tempIndex');
                 } 
-                return true;
             }
-            return foo.call(foo);
-}
-runTestCase(testcase);
+            foo.call(foo);
diff --git a/test/language/statements/function/13.2-3-s.js b/test/language/statements/function/13.2-3-s.js
index e4d6f123b9..3c93a1f65f 100644
--- a/test/language/statements/function/13.2-3-s.js
+++ b/test/language/statements/function/13.2-3-s.js
@@ -6,14 +6,11 @@ es5id: 13.2-3-s
 description: >
     StrictMode - Writing or reading from a property named 'arguments'
     of function objects is allowed under both strict and normal modes.
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () {
             this.arguments = 12;
         } 
         var obj = new foo();
-        return obj.arguments === 12;
-    }
-runTestCase(testcase);
+
+assert.sameValue(obj.arguments, 12, 'obj.arguments');
diff --git a/test/language/statements/function/13.2-7-s.js b/test/language/statements/function/13.2-7-s.js
index c3110ba79d..d91c4f01a5 100644
--- a/test/language/statements/function/13.2-7-s.js
+++ b/test/language/statements/function/13.2-7-s.js
@@ -7,17 +7,10 @@ description: >
     StrictMode - enumerating over a function object looking for
     'caller' fails outside of the function
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = new Function("'use strict';");
         
         for (var tempIndex in foo) {
-            if (tempIndex === "caller") {
-                return false;
-            }
+            assert.notSameValue(tempIndex, "caller", 'tempIndex');
         }
-        return true;
-    }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-8-s.js b/test/language/statements/function/13.2-8-s.js
index c6c3da8aa1..a297ab7952 100644
--- a/test/language/statements/function/13.2-8-s.js
+++ b/test/language/statements/function/13.2-8-s.js
@@ -7,11 +7,7 @@ description: >
     StrictMode - enumerating over a function object looking for
     'caller' fails inside the function
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-            var foo = new Function("'use strict'; for (var tempIndex in this) {if (tempIndex===\"caller\") {return false;}}; return true;");
-            return foo.call(foo);
-    }
-runTestCase(testcase);
+            var foo = new Function("'use strict'; for (var tempIndex in this) {assert.notSameValue(tempIndex, 'caller', 'tempIndex');}");
+            foo.call(foo);
diff --git a/test/language/statements/try/12.14-1.js b/test/language/statements/try/12.14-1.js
index 76ce1dc32d..c7c8bf2f8c 100644
--- a/test/language/statements/try/12.14-1.js
+++ b/test/language/statements/try/12.14-1.js
@@ -7,10 +7,8 @@ description: >
     catch doesn't change declaration scope - var initializer in catch
     with same name as catch parameter changes parameter
 features: [AnnexB]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   foo = "prior to throw";
   try {
     throw new Error();
@@ -18,7 +16,5 @@ function testcase() {
   catch (foo) {
     var foo = "initializer in catch";
   }
- return foo === "prior to throw";
-  
- }
-runTestCase(testcase);
+
+assert.sameValue(foo, "prior to throw");
diff --git a/test/language/statements/try/12.14-10.js b/test/language/statements/try/12.14-10.js
index 01c7c9f41a..d3720bfc15 100644
--- a/test/language/statements/try/12.14-10.js
+++ b/test/language/statements/try/12.14-10.js
@@ -4,10 +4,8 @@
 /*---
 es5id: 12.14-10
 description: catch introduces scope - name lookup finds function parameter
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   function f(o) {
 
     function innerf(o, x) {
@@ -21,9 +19,5 @@ function testcase() {
 
     return innerf(o, 42);
   }
-  
-  if (f({}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({}), 42);
diff --git a/test/language/statements/try/12.14-11.js b/test/language/statements/try/12.14-11.js
index 3961ab1039..1671cfe8fb 100644
--- a/test/language/statements/try/12.14-11.js
+++ b/test/language/statements/try/12.14-11.js
@@ -4,10 +4,8 @@
 /*---
 es5id: 12.14-11
 description: catch introduces scope - name lookup finds inner variable
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   function f(o) {
 
     function innerf(o) {
@@ -23,9 +21,5 @@ function testcase() {
 
     return innerf(o);
   }
-  
-  if (f({}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({}), 42);
diff --git a/test/language/statements/try/12.14-12.js b/test/language/statements/try/12.14-12.js
index 01f2ea64bd..39260df919 100644
--- a/test/language/statements/try/12.14-12.js
+++ b/test/language/statements/try/12.14-12.js
@@ -4,10 +4,8 @@
 /*---
 es5id: 12.14-12
 description: catch introduces scope - name lookup finds property
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   function f(o) {
 
     function innerf(o) {
@@ -21,9 +19,5 @@ function testcase() {
 
     return innerf(o);
   }
-  
-  if (f({x:42}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({x:42}), 42);
diff --git a/test/language/statements/try/12.14-2.js b/test/language/statements/try/12.14-2.js
index 4bc8dcd8d5..7ddd343aa0 100644
--- a/test/language/statements/try/12.14-2.js
+++ b/test/language/statements/try/12.14-2.js
@@ -7,10 +7,8 @@ description: >
     catch doesn't change declaration scope - var initializer in catch
     with same name as catch parameter changes parameter
 features: [AnnexB]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   function capturedFoo() {return foo};
   foo = "prior to throw";
   try {
@@ -18,8 +16,6 @@ function testcase() {
   }
   catch (foo) {
     var foo = "initializer in catch";
-    return capturedFoo() !== "initializer in catch";
   }
-  
- }
-runTestCase(testcase);
+
+assert.sameValue(capturedFoo(), "prior to throw");
diff --git a/test/language/statements/try/12.14-3.js b/test/language/statements/try/12.14-3.js
index 0ca154a985..37cf6e9d27 100644
--- a/test/language/statements/try/12.14-3.js
+++ b/test/language/statements/try/12.14-3.js
@@ -14,17 +14,13 @@ es5id: 12.14-3
 description: >
     catch doesn't change declaration scope - var declaration are
     visible outside when name different from catch parameter
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   try {
     throw new Error();
   }
   catch (e) {
     var foo = "declaration in catch";
   }
-  
-  return foo === "declaration in catch";
- }
-runTestCase(testcase);
+
+assert.sameValue(foo, "declaration in catch");
diff --git a/test/language/statements/try/12.14-4.js b/test/language/statements/try/12.14-4.js
index a55795870a..1ce1900775 100644
--- a/test/language/statements/try/12.14-4.js
+++ b/test/language/statements/try/12.14-4.js
@@ -12,10 +12,8 @@ info: >
     eval should use the appended object to the scope chain
 es5id: 12.14-4
 description: catch introduces scope - block-local vars must shadow outer vars
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var o = { foo : 42};
 
   try {
@@ -23,10 +21,6 @@ function testcase() {
   }
   catch (e) {
     var foo;
-
-    if (foo === undefined) {
-      return true;
-    }
   }
- }
-runTestCase(testcase);
+
+assert.sameValue(foo, undefined);
diff --git a/test/language/statements/try/12.14-6.js b/test/language/statements/try/12.14-6.js
index 8f2a2d5777..43052c9c54 100644
--- a/test/language/statements/try/12.14-6.js
+++ b/test/language/statements/try/12.14-6.js
@@ -14,10 +14,8 @@ es5id: 12.14-6
 description: >
     catch introduces scope - block-local function expression must
     shadow outer function expression
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var o = {foo : function () { return 42;}};
 
   try {
@@ -25,9 +23,6 @@ function testcase() {
   }
   catch (e) {
     var foo = function () {};
-    if (foo() === undefined) {
-      return true;
-    }
   }
- }
-runTestCase(testcase);
+
+assert.sameValue(foo(), undefined);
diff --git a/test/language/statements/try/12.14-7.js b/test/language/statements/try/12.14-7.js
index 2f86ec68d4..d8acf17b1f 100644
--- a/test/language/statements/try/12.14-7.js
+++ b/test/language/statements/try/12.14-7.js
@@ -12,10 +12,8 @@ info: >
     eval should use the appended object to the scope chain
 es5id: 12.14-7
 description: catch introduces scope - scope removed when exiting catch block
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
       var o = {foo: 1};
       var catchAccessed = false;
       
@@ -25,13 +23,14 @@ function testcase() {
       catch (expObj) {
         catchAccessed = (expObj.foo == 1);
       }
+      assert(catchAccessed, '(expObj.foo == 1)');
 
+
+      catchAccessed = false;
       try {
         expObj;
       }
       catch (e) {
-        return catchAccessed && e instanceof ReferenceError
+        catchAccessed = e instanceof ReferenceError
       }
-      return false;
-    }
-runTestCase(testcase);
+      assert(catchAccessed, 'e instanceof ReferenceError');
diff --git a/test/language/statements/try/12.14-8.js b/test/language/statements/try/12.14-8.js
index 1fe9ae1cad..16986ef685 100644
--- a/test/language/statements/try/12.14-8.js
+++ b/test/language/statements/try/12.14-8.js
@@ -14,10 +14,8 @@ es5id: 12.14-8
 description: >
     catch introduces scope - scope removed when exiting catch block
     (properties)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var o = {foo: 42};
 
   try {
@@ -27,8 +25,4 @@ function testcase() {
     var foo = 1;
   }
 
-  if (o.foo === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+assert.sameValue(o.foo, 42);
diff --git a/test/language/statements/try/12.14-9.js b/test/language/statements/try/12.14-9.js
index 7e129581cb..d2ee163843 100644
--- a/test/language/statements/try/12.14-9.js
+++ b/test/language/statements/try/12.14-9.js
@@ -4,10 +4,8 @@
 /*---
 es5id: 12.14-9
 description: catch introduces scope - name lookup finds outer variable
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   function f(o) {
     var x = 42;
 
@@ -22,9 +20,5 @@ function testcase() {
 
     return innerf(o);
   }
-  
-  if (f({}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({}), 42);
diff --git a/test/language/statements/try/12.14.1-4-s.js b/test/language/statements/try/12.14.1-4-s.js
index f035689c17..b9d306e9cb 100644
--- a/test/language/statements/try/12.14.1-4-s.js
+++ b/test/language/statements/try/12.14.1-4-s.js
@@ -7,15 +7,14 @@ description: >
     Strict Mode - SyntaxError isn't thrown if a TryStatement with a
     Catch occurs within strict code and the Identifier of the Catch
     production is EVAL
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
+var isInstance = false;
+
         try {
             throw new Error("...");
-            return false;
         } catch (EVAL) {
-            return EVAL instanceof Error;
+            isInstance = EVAL instanceof Error;
         }
-    }
-runTestCase(testcase);
+
+assert(isInstance);
diff --git a/test/language/statements/try/12.14.1-5-s.js b/test/language/statements/try/12.14.1-5-s.js
index c29979d3fb..e589e635b1 100644
--- a/test/language/statements/try/12.14.1-5-s.js
+++ b/test/language/statements/try/12.14.1-5-s.js
@@ -7,15 +7,14 @@ description: >
     Strict Mode - SyntaxError isn't thrown if a TryStatement with a
     Catch occurs within strict code and the Identifier of the Catch
     production is Arguments
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
+var isInstance = false;
+
         try {
             throw new Error("...");
-            return false;
         } catch (Arguments) {
-            return Arguments instanceof Error;
+            isInstance = Arguments instanceof Error;
         }
-    }
-runTestCase(testcase);
+
+assert(isInstance);
diff --git a/test/language/statements/try/12.14.1-6-s.js b/test/language/statements/try/12.14.1-6-s.js
index afa0e7134f..ccade6497d 100644
--- a/test/language/statements/try/12.14.1-6-s.js
+++ b/test/language/statements/try/12.14.1-6-s.js
@@ -7,15 +7,14 @@ description: >
     Strict Mode - SyntaxError isn't thrown if a TryStatement with a
     Catch occurs within strict code and the Identifier of the Catch
     production is ARGUMENTS
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
+var isInstance = false;
+
         try {
             throw new Error("...");
-            return false;
         } catch (ARGUMENTS) {
-            return ARGUMENTS instanceof Error;
+            isInstance = ARGUMENTS instanceof Error;
         }
-    }
-runTestCase(testcase);
+
+assert(isInstance);
diff --git a/test/language/statements/variable/12.2.1-11.js b/test/language/statements/variable/12.2.1-11.js
index e908dd48a6..5c49b6fe48 100644
--- a/test/language/statements/variable/12.2.1-11.js
+++ b/test/language/statements/variable/12.2.1-11.js
@@ -4,12 +4,10 @@
 /*---
 es5id: 12.2.1-11
 description: arguments as var identifier in eval code is allowed
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
 function testcase() {
     eval("var arguments;");
-    return true;
  }
-runTestCase(testcase);
+testcase();
diff --git a/test/language/statements/variable/12.2.1-12.js b/test/language/statements/variable/12.2.1-12.js
index a0de7fe046..130ecf0eb6 100644
--- a/test/language/statements/variable/12.2.1-12.js
+++ b/test/language/statements/variable/12.2.1-12.js
@@ -4,12 +4,7 @@
 /*---
 es5id: 12.2.1-12
 description: arguments as local var identifier is allowed
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
     eval("(function (){var arguments;})");
-    return true;
- }
-runTestCase(testcase);
diff --git a/test/language/statements/variable/12.2.1-16-s.js b/test/language/statements/variable/12.2.1-16-s.js
index 24e66f1c59..b7579348c1 100644
--- a/test/language/statements/variable/12.2.1-16-s.js
+++ b/test/language/statements/variable/12.2.1-16-s.js
@@ -6,11 +6,6 @@ es5id: 12.2.1-16-s
 description: >
     A Function constructor (called as a function) declaring a var
     named 'arguments' does not throw a SyntaxError
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         Function('var arguments;');
-        return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/variable/12.2.1-17-s.js b/test/language/statements/variable/12.2.1-17-s.js
index 9eb870194f..2318ba0de6 100644
--- a/test/language/statements/variable/12.2.1-17-s.js
+++ b/test/language/statements/variable/12.2.1-17-s.js
@@ -8,12 +8,7 @@ description: >
     'arguments' will not throw any error if contained within strict
     mode and its body does not start with strict mode
 flags: [onlyStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
     var f = Function('arguments = 42;');
     f();
-    return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/variable/12.2.1-20-s.js b/test/language/statements/variable/12.2.1-20-s.js
index 08c3968833..62d9687056 100644
--- a/test/language/statements/variable/12.2.1-20-s.js
+++ b/test/language/statements/variable/12.2.1-20-s.js
@@ -6,12 +6,7 @@ es5id: 12.2.1-20-s
 description: >
     Strict Mode: an indirect eval declaring a var named 'arguments'
     does not throw
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var s = eval;
   s('var arguments;');
-  return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/variable/12.2.1-21-s.js b/test/language/statements/variable/12.2.1-21-s.js
index b4baa0e152..05128f037e 100644
--- a/test/language/statements/variable/12.2.1-21-s.js
+++ b/test/language/statements/variable/12.2.1-21-s.js
@@ -6,12 +6,7 @@ es5id: 12.2.1-21-s
 description: >
     Strict Mode: an indirect eval assigning into 'arguments' does not
     throw
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var s = eval;
   s('arguments = 42;');
-  return true;
-}
-runTestCase(testcase);
diff --git a/test/language/statements/variable/12.2.1-9-s.js b/test/language/statements/variable/12.2.1-9-s.js
index 9e8fae42cf..d30834bd88 100644
--- a/test/language/statements/variable/12.2.1-9-s.js
+++ b/test/language/statements/variable/12.2.1-9-s.js
@@ -5,12 +5,7 @@
 es5id: 12.2.1-9-s
 description: >
     an indirect eval declaring a var named 'eval' does not throw
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var s = eval;
   s('var eval;');
-  return true;
- }
-runTestCase(testcase);
diff --git a/test/language/statements/with/12.10-0-10.js b/test/language/statements/with/12.10-0-10.js
index 55b8e9620d..759f223480 100644
--- a/test/language/statements/with/12.10-0-10.js
+++ b/test/language/statements/with/12.10-0-10.js
@@ -4,11 +4,9 @@
 /*---
 es5id: 12.10-0-10
 description: with introduces scope - name lookup finds function parameter
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   function f(o) {
 
     function innerf(o, x) {
@@ -19,9 +17,5 @@ function testcase() {
 
     return innerf(o, 42);
   }
-  
-  if (f({}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({}), 42);
diff --git a/test/language/statements/with/12.10-0-11.js b/test/language/statements/with/12.10-0-11.js
index 689c342bb8..28a1c79ba4 100644
--- a/test/language/statements/with/12.10-0-11.js
+++ b/test/language/statements/with/12.10-0-11.js
@@ -4,11 +4,9 @@
 /*---
 es5id: 12.10-0-11
 description: with introduces scope - name lookup finds inner variable
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   function f(o) {
 
     function innerf(o) {
@@ -21,9 +19,5 @@ function testcase() {
 
     return innerf(o);
   }
-  
-  if (f({}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({}), 42);
diff --git a/test/language/statements/with/12.10-0-12.js b/test/language/statements/with/12.10-0-12.js
index 605b79f774..324b772afb 100644
--- a/test/language/statements/with/12.10-0-12.js
+++ b/test/language/statements/with/12.10-0-12.js
@@ -4,11 +4,9 @@
 /*---
 es5id: 12.10-0-12
 description: with introduces scope - name lookup finds property
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   function f(o) {
 
     function innerf(o) {
@@ -19,9 +17,5 @@ function testcase() {
 
     return innerf(o);
   }
-  
-  if (f({x:42}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({x:42}), 42);
diff --git a/test/language/statements/with/12.10-0-7.js b/test/language/statements/with/12.10-0-7.js
index 9d7dbdb298..72e38e9fbb 100644
--- a/test/language/statements/with/12.10-0-7.js
+++ b/test/language/statements/with/12.10-0-7.js
@@ -4,11 +4,9 @@
 /*---
 es5id: 12.10-0-7
 description: with introduces scope - scope removed when exiting with statement
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var o = {foo: 1};
 
   with (o) {
@@ -17,9 +15,8 @@ function testcase() {
 
   try {
     foo;
+    throw new Error();
   }
   catch (e) {
-     return true;
+    assert(e instanceof ReferenceError);
   }
- }
-runTestCase(testcase);
diff --git a/test/language/statements/with/12.10-0-9.js b/test/language/statements/with/12.10-0-9.js
index 3e7df5afdb..f18b3798be 100644
--- a/test/language/statements/with/12.10-0-9.js
+++ b/test/language/statements/with/12.10-0-9.js
@@ -4,11 +4,9 @@
 /*---
 es5id: 12.10-0-9
 description: with introduces scope - name lookup finds outer variable
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   function f(o) {
     var x = 42;
 
@@ -20,9 +18,5 @@ function testcase() {
 
     return innerf(o);
   }
-  
-  if (f({}) === 42) {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(f({}), 42);
diff --git a/test/language/statements/with/12.10-2-1.js b/test/language/statements/with/12.10-2-1.js
index 6fd93a0c3d..6b42928ed8 100644
--- a/test/language/statements/with/12.10-2-1.js
+++ b/test/language/statements/with/12.10-2-1.js
@@ -4,23 +4,13 @@
 /*---
 es5id: 12.10-2-1
 description: with - expression being Number
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var o = 2;
   var foo = 1;
-  try
-  {
     with (o) {
       foo = 42;
     }
-  }
-  catch(e)
-  {
-  }
-  return true;
-  
- }
-runTestCase(testcase);
+
+assert.sameValue(foo, 42);
diff --git a/test/language/statements/with/12.10-2-2.js b/test/language/statements/with/12.10-2-2.js
index 2f2a2ae9a8..15635e69e6 100644
--- a/test/language/statements/with/12.10-2-2.js
+++ b/test/language/statements/with/12.10-2-2.js
@@ -4,23 +4,13 @@
 /*---
 es5id: 12.10-2-2
 description: with - expression being Boolean
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var o = true;
   var foo = 1;
-  try
-  {
     with (o) {
       foo = 42;
     }
-  }
-  catch(e)
-  {
-  }
-  return true;
-  
- }
-runTestCase(testcase);
+
+assert.sameValue(foo, 42);
diff --git a/test/language/statements/with/12.10-2-3.js b/test/language/statements/with/12.10-2-3.js
index fd3f6c9b00..4b07ea5d0c 100644
--- a/test/language/statements/with/12.10-2-3.js
+++ b/test/language/statements/with/12.10-2-3.js
@@ -4,23 +4,13 @@
 /*---
 es5id: 12.10-2-3
 description: with - expression being string
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var o = "str";
   var foo = 1;
-  try
-  {
     with (o) {
       foo = 42;
     }
-  }
-  catch(e)
-  {
-  }
-  return true;
-  
- }
-runTestCase(testcase);
+
+assert.sameValue(foo, 42);
diff --git a/test/language/statements/with/12.10-7-1.js b/test/language/statements/with/12.10-7-1.js
index 5d38a0d0fb..62c1a50489 100644
--- a/test/language/statements/with/12.10-7-1.js
+++ b/test/language/statements/with/12.10-7-1.js
@@ -4,28 +4,21 @@
 /*---
 es5id: 12.10-7-1
 description: with introduces scope - restores the earlier environment on exit
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var a = 1;
 
   var o = {a : 2};
-  try
-  {
+  try {
     with (o) {
       a = 3;
       throw 1;
       a = 4;
     }
-  }
-  catch(e)
-  {}
-
-  if (a === 1 && o.a === 3) {
-      return true;
+  } catch (e) {
+    // intentionally ignored
   }
 
- }
-runTestCase(testcase);
+assert.sameValue(a, 1, 'a');
+assert.sameValue(o.a, 3, 'o.a');
diff --git a/test/language/statements/with/12.10.1-13-s.js b/test/language/statements/with/12.10.1-13-s.js
index 453435feae..78f71260ec 100644
--- a/test/language/statements/with/12.10.1-13-s.js
+++ b/test/language/statements/with/12.10.1-13-s.js
@@ -7,13 +7,8 @@ description: >
     Strict Mode - SyntaxError isn't thrown when WithStatement body is
     in strict mode code
 flags: [noStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         with ({}) {
             "use strict";
         }
-        return true;
-    }
-runTestCase(testcase);
diff --git a/test/language/statements/with/12.10.1-5-s.js b/test/language/statements/with/12.10.1-5-s.js
index 9f6a6e4423..955dcaedfe 100644
--- a/test/language/statements/with/12.10.1-5-s.js
+++ b/test/language/statements/with/12.10.1-5-s.js
@@ -7,13 +7,6 @@ description: >
     with statement allowed in nested Function even if its container
     Function is strict)
 flags: [onlyStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-  
     Function("\'use strict\'; var f1 = Function( \"var o = {}; with (o) {};\")");
-    return true;
-  
- }
-runTestCase(testcase);