fix(ngScenario): select().option(val) should prefer exact value match

With select(...).option(val) it previously would select the first node
which contains the value, even if an exact match was available.
This fix prefers exact matches if available, otherwise it reverts
to the previous 'contains' behaviour for backwards compatibility.

Closes #2856

src/ngScenario/dsl.js

@@ -295,7 +295,12 @@ angular.scenario.dsl('select', function() {
       if (option.length) {
         select.val(value);
       } else {
-        option = select.find('option:contains("' + value + '")');
+        option = select.find('option').filter(function(){
+          return _jQuery(this).text() === value;
+        });
+        if (!option.length) {
+          option = select.find('option:contains("' + value + '")');
+        }
         if (option.length) {
           select.val(option.val());
         } else {

test/ngScenario/dslSpec.js

@@ -227,6 +227,7 @@ describe("angular.scenario.dsl", function() {
         $root.dsl.select('test').option('A');
         expect(doc.find('[data-ng-model="test"]').val()).toEqual('A');
       });
+
       it('should select single option using x-ng', function() {
         doc.append(
           '<select x-ng-model="test">' +
@@ -238,14 +239,25 @@ describe("angular.scenario.dsl", function() {
         expect(doc.find('[x-ng-model="test"]').val()).toEqual('A');
       });
 
+      it('should select option by exact name', function() {
+        doc.append(
+            '<select ng-model="test">' +
+            '  <option value=A>twenty one</option>' +
+            '  <option value=B selected>two</option>' +
+            '  <option value=C>thirty one</option>' +
+            '  <option value=D>one</option>' +
+            '</select>'
+          );
+          $root.dsl.select('test').option('one');
+          expect(doc.find('[ng-model="test"]').val()).toEqual('D');
+      });
 
-
-
-      it('should select option by name', function() {
+      it('should select option by name if no exact match and name contains value', function() {
         doc.append(
             '<select ng-model="test">' +
-            '  <option value=A>one</option>' +
+            '  <option value=A>twenty one</option>' +
             '  <option value=B selected>two</option>' +
+            '  <option value=C>thirty one</option>' +
             '</select>'
           );
           $root.dsl.select('test').option('one');