Don't attach spec helpers to the env

spec/core/integration/EnvSpec.js

@@ -3,7 +3,7 @@ describe('Env integration', function() {
   const isBrowser = typeof window !== 'undefined';
 
   beforeEach(function() {
-    jasmine.getEnv().registerIntegrationMatchers();
+    specHelpers.registerIntegrationMatchers();
     env = new jasmineUnderTest.Env();
   });
 

spec/core/integration/MatchersSpec.js

@@ -610,19 +610,13 @@ describe('Matchers (Integration)', function() {
   });
 
   describe('toHaveClass', function() {
-    beforeEach(function() {
-      this.domHelpers = jasmine.getEnv().domHelpers();
-    });
-
     verifyPasses(function(env) {
-      const domHelpers = jasmine.getEnv().domHelpers();
-      const el = domHelpers.createElementWithClassName('foo');
+      const el = specHelpers.domHelpers.createElementWithClassName('foo');
       env.expect(el).toHaveClass('foo');
     });
 
     verifyFails(function(env) {
-      const domHelpers = jasmine.getEnv().domHelpers();
-      const el = domHelpers.createElementWithClassName('foo');
+      const el = specHelpers.domHelpers.createElementWithClassName('foo');
       env.expect(el).toHaveClass('bar');
     });
   });

spec/core/integration/SpecRunningSpec.js

@@ -2,7 +2,7 @@ describe('spec running', function() {
   let env;
 
   beforeEach(function() {
-    jasmine.getEnv().registerIntegrationMatchers();
+    specHelpers.registerIntegrationMatchers();
     env = new jasmineUnderTest.Env();
     env.configure({ random: false });
   });