Eliminate false positives: String.prototype.trimEnd, String.prototype.trimStart

test/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-returns-object-err.js

@@ -33,6 +33,7 @@ var thisVal = {
   },
 };
 
+assert.sameValue(typeof String.prototype.trimEnd, 'function');
 assert.throws(TypeError, function() {
   String.prototype.trimEnd.call(thisVal);
 });

test/built-ins/String/prototype/trimEnd/this-value-object-tostring-returns-object-err.js

@@ -51,6 +51,7 @@ var thisVal = {
   },
 };
 
+assert.sameValue(typeof String.prototype.trimEnd, 'function');
 assert.throws(TypeError, function() {
   String.prototype.trimEnd.call(thisVal);
 });

test/built-ins/String/prototype/trimEnd/this-value-object-valueof-returns-object-err.js

@@ -52,6 +52,7 @@ var thisVal = {
   },
 };
 
+assert.sameValue(typeof String.prototype.trimEnd, 'function');
 assert.throws(TypeError, function() {
   String.prototype.trimEnd.call(thisVal);
 });

test/built-ins/String/prototype/trimStart/this-value-object-toprimitive-returns-object-err.js

@@ -33,6 +33,7 @@ var thisVal = {
   },
 };
 
+assert.sameValue(typeof String.prototype.trimStart, 'function');
 assert.throws(TypeError, function() {
   String.prototype.trimStart.call(thisVal);
 });

test/built-ins/String/prototype/trimStart/this-value-object-tostring-returns-object-err.js

@@ -51,6 +51,7 @@ var thisVal = {
   },
 };
 
+assert.sameValue(typeof String.prototype.trimStart, 'function');
 assert.throws(TypeError, function() {
   String.prototype.trimStart.call(thisVal);
 });

test/built-ins/String/prototype/trimStart/this-value-object-valueof-returns-object-err.js

@@ -52,6 +52,7 @@ var thisVal = {
   },
 };
 
+assert.sameValue(typeof String.prototype.trimStart, 'function');
 assert.throws(TypeError, function() {
   String.prototype.trimStart.call(thisVal);
 });