diff --git a/test/language/statements/break/12.8-1.js b/test/language/statements/break/12.8-1.js
index eb32c31af4..82137439e2 100644
--- a/test/language/statements/break/12.8-1.js
+++ b/test/language/statements/break/12.8-1.js
@@ -6,10 +6,8 @@ es5id: 12.8-1
 description: >
     The break Statement - a break statement without an identifier may
     have a LineTerminator before the semi-colon
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var sum = 0;
         for (var i = 1; i <= 10; i++) {
             if (i === 6) {
@@ -18,6 +16,5 @@ function testcase() {
             }
             sum += i;
         }
-        return sum === 15;
-    }
-runTestCase(testcase);
+
+assert.sameValue(sum, 15, 'sum');
diff --git a/test/language/statements/continue/12.7-1.js b/test/language/statements/continue/12.7-1.js
index d9092bc964..b97021377d 100644
--- a/test/language/statements/continue/12.7-1.js
+++ b/test/language/statements/continue/12.7-1.js
@@ -6,16 +6,13 @@ es5id: 12.7-1
 description: >
     The continue Statement - a continue statement without an
     identifier may have a LineTerminator before the semi-colon
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var sum = 0;
         for (var i = 1; i <= 10; i++) {
             continue
             ;
             sum += i;
         }
-        return sum === 0;
-    }
-runTestCase(testcase);
+
+assert.sameValue(sum, 0, 'sum');
diff --git a/test/language/statements/for-in/12.6.4-1.js b/test/language/statements/for-in/12.6.4-1.js
index 71a7ad5ccb..92284ee3c1 100644
--- a/test/language/statements/for-in/12.6.4-1.js
+++ b/test/language/statements/for-in/12.6.4-1.js
@@ -6,10 +6,8 @@ es5id: 12.6.4-1
 description: >
     The for-in Statement - a property name must not be visited more
     than once in any enumeration.
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = { prop1: "abc", prop2: "bbc", prop3: "cnn" };
 
         var countProp1 = 0;
@@ -29,6 +27,7 @@ function testcase() {
                 }
             }
         }
-        return countProp1 === 1 && countProp2 === 1 && countProp3 === 1;
-    }
-runTestCase(testcase);
+
+assert.sameValue(countProp1, 1, 'countProp1');
+assert.sameValue(countProp2, 1, 'countProp2');
+assert.sameValue(countProp3, 1, 'countProp3');
diff --git a/test/language/statements/for-in/12.6.4-2.js b/test/language/statements/for-in/12.6.4-2.js
index 2fc274aa32..f2992054c4 100644
--- a/test/language/statements/for-in/12.6.4-2.js
+++ b/test/language/statements/for-in/12.6.4-2.js
@@ -7,10 +7,8 @@ description: >
     The for-in Statement - the values of [[Enumerable]] attributes are
     not considered when determining if a property of a prototype
     object is shadowed by a previous object on the prototype chain
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var proto = {
             prop: "enumerableValue"
         };
@@ -32,6 +30,5 @@ function testcase() {
                 accessedProp = true;
             }
         }
-        return !accessedProp;
-    }
-runTestCase(testcase);
+
+assert.sameValue(accessedProp, false, 'accessedProp');
diff --git a/test/language/statements/function/13.0-12-s.js b/test/language/statements/function/13.0-12-s.js
index edae04cdf1..6443a087aa 100644
--- a/test/language/statements/function/13.0-12-s.js
+++ b/test/language/statements/function/13.0-12-s.js
@@ -11,13 +11,7 @@ description: >
     when a Function constructor is contained in strict mode code and
     the function constructor body is not strict
 flags: [onlyStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var _13_0_12_fun = new Function(" ","eval = 42;");
         _13_0_12_fun();
-        return true;
-
-    }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.1-2-2.js b/test/language/statements/function/13.1-2-2.js
index 12c1eeaea6..c3e856734f 100644
--- a/test/language/statements/function/13.1-2-2.js
+++ b/test/language/statements/function/13.1-2-2.js
@@ -6,13 +6,7 @@ es5id: 13.1-2-2
 description: >
     eval allowed as formal parameter name of a non-strict function
     expression
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase()
-{
     eval("(function foo(eval){});");
-    return true;
- }
-runTestCase(testcase);
diff --git a/test/language/statements/function/13.2-1-s.js b/test/language/statements/function/13.2-1-s.js
index ec7ae1bc84..3a239777bb 100644
--- a/test/language/statements/function/13.2-1-s.js
+++ b/test/language/statements/function/13.2-1-s.js
@@ -6,14 +6,11 @@ es5id: 13.2-1-s
 description: >
     StrictMode -  Writing or reading from a property named 'caller' of
     function objects is allowed under both strict and normal modes.
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () {
             this.caller = 12;
         }
         var obj = new foo();
-        return obj.caller === 12;
-    }
-runTestCase(testcase);
+
+assert.sameValue(obj.caller, 12, 'obj.caller');
diff --git a/test/language/statements/return/12.9-1.js b/test/language/statements/return/12.9-1.js
index 9a971ca0ad..c2f38544c6 100644
--- a/test/language/statements/return/12.9-1.js
+++ b/test/language/statements/return/12.9-1.js
@@ -6,10 +6,8 @@ es5id: 12.9-1
 description: >
     The return Statement - a return statement without an expression
     may have a LineTerminator before the semi-colon
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var sum = 0;
         (function innerTest() {
             for (var i = 1; i <= 10; i++) {
@@ -20,6 +18,5 @@ function testcase() {
                 sum += i;
             }
         })();
-        return sum === 15;
-    }
-runTestCase(testcase);
+
+assert.sameValue(sum, 15, 'sum');
diff --git a/test/language/statements/variable/12.2.1-10-s.js b/test/language/statements/variable/12.2.1-10-s.js
index 971999ed09..726918d10c 100644
--- a/test/language/statements/variable/12.2.1-10-s.js
+++ b/test/language/statements/variable/12.2.1-10-s.js
@@ -4,12 +4,7 @@
 /*---
 es5id: 12.2.1-10-s
 description: "Strict Mode: an indirect eval assigning into 'eval' does not throw"
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var s = eval;
   s('eval = 42;');
-  return true;
- }
-runTestCase(testcase);
diff --git a/test/language/statements/variable/12.2.1-5-s.js b/test/language/statements/variable/12.2.1-5-s.js
index 33f7dab39a..5f7dee6243 100644
--- a/test/language/statements/variable/12.2.1-5-s.js
+++ b/test/language/statements/variable/12.2.1-5-s.js
@@ -5,11 +5,6 @@
 es5id: 12.2.1-5-s
 description: >
     a Function declaring var named 'eval' does not throw SyntaxError
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         Function('var eval;');
-        return true;
-    }
-runTestCase(testcase);
diff --git a/test/language/statements/variable/12.2.1-6-s.js b/test/language/statements/variable/12.2.1-6-s.js
index 1fd3571b27..28980b317a 100644
--- a/test/language/statements/variable/12.2.1-6-s.js
+++ b/test/language/statements/variable/12.2.1-6-s.js
@@ -8,12 +8,7 @@ description: >
     if contained within strict mode and its body does not start with
     strict mode
 flags: [onlyStrict]
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
     var f = Function('eval = 42;');
     f();
-    return true;
- }
-runTestCase(testcase);
diff --git a/test/language/statements/with/12.10-0-1.js b/test/language/statements/with/12.10-0-1.js
index 9f46c0c83f..99d94cf07c 100644
--- a/test/language/statements/with/12.10-0-1.js
+++ b/test/language/statements/with/12.10-0-1.js
@@ -6,11 +6,9 @@ es5id: 12.10-0-1
 description: >
     with does not change declaration scope - vars in with are visible
     outside
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var o = {};
   var f = function () {
 	/* capture foo binding before executing with */
@@ -21,7 +19,4 @@ function testcase() {
     var foo = "12.10-0-1";
   }
 
-  return f()==="12.10-0-1"
-
- }
-runTestCase(testcase);
+assert.sameValue(f(), "12.10-0-1", 'f()');
diff --git a/test/language/statements/with/12.10-0-3.js b/test/language/statements/with/12.10-0-3.js
index 920491628a..36be6a87a1 100644
--- a/test/language/statements/with/12.10-0-3.js
+++ b/test/language/statements/with/12.10-0-3.js
@@ -4,11 +4,9 @@
 /*---
 es5id: 12.10-0-3
 description: with introduces scope - that is captured by function expression
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var o = {prop: "12.10-0-3 before"};
   var f;
 
@@ -16,6 +14,5 @@ function testcase() {
     f = function () { return prop; }
   }
   o.prop = "12.10-0-3 after";
-  return f()==="12.10-0-3 after"
- }
-runTestCase(testcase);
+
+assert.sameValue(f(), "12.10-0-3 after", 'f()');
diff --git a/test/language/statements/with/12.10-0-8.js b/test/language/statements/with/12.10-0-8.js
index e3ed146049..e58d29a98f 100644
--- a/test/language/statements/with/12.10-0-8.js
+++ b/test/language/statements/with/12.10-0-8.js
@@ -4,17 +4,13 @@
 /*---
 es5id: 12.10-0-8
 description: with introduces scope - var initializer sets like named property
-includes: [runTestCase.js]
 flags: [noStrict]
 ---*/
 
-function testcase() {
   var o = {foo: 42};
 
   with (o) {
     var foo = "set in with";
   }
 
-  return o.foo === "set in with";
- }
-runTestCase(testcase);
+assert.sameValue(o.foo, "set in with", 'o.foo');