Use explicit this in helper-test blueprints

(cherry picked from commit 844c2f4)

blueprints/helper-test/mocha-0.12-files/__root__/__testType__/__collection__/__name__-test.js

@@ -19,7 +19,7 @@ describe('<%= friendlyTestName %>', function() {
     // `);
     this.set('inputValue', '1234');
 
-    this.render(hbs`{{<%= dasherizedModuleName %> inputValue}}`);
+    this.render(hbs`{{<%= dasherizedModuleName %> this.inputValue}}`);
 
     expect(this.$().text().trim()).to.equal('1234');
   });

blueprints/helper-test/mocha-files/__root__/__testType__/__collection__/__name__-test.js

@@ -19,7 +19,7 @@ describeComponent('<%= dasherizedModuleName %>', 'helper:<%= dasherizedModuleNam
       // `);
       this.set('inputValue', '1234');
 
-      this.render(hbs`{{<%= dasherizedModuleName %> inputValue}}`);
+      this.render(hbs`{{<%= dasherizedModuleName %> this.inputValue}}`);
 
       expect(this.$().text().trim()).to.equal('1234');
     });

blueprints/helper-test/mocha-rfc-232-files/__root__/__testType__/__collection__/__name__-test.js

@@ -11,7 +11,7 @@ describe('<%= friendlyTestName %>', function() {
   it('renders', async function() {
     this.set('inputValue', '1234');
 
-    await render(hbs`{{<%= dasherizedModuleName %> inputValue}}`);
+    await render(hbs`{{<%= dasherizedModuleName %> this.inputValue}}`);
 
     expect(this.element.textContent.trim()).to.equal('1234');
   });

blueprints/helper-test/qunit-files/__root__/__testType__/__collection__/__name__-test.js

@@ -9,7 +9,7 @@ moduleForComponent('<%= dasherizedModuleName %>', 'helper:<%= dasherizedModuleNa
 test('it renders', function(assert) {
   this.set('inputValue', '1234');
 
-  this.render(hbs`{{<%= dasherizedModuleName %> inputValue}}`);
+  this.render(hbs`{{<%= dasherizedModuleName %> this.inputValue}}`);
 
   assert.equal(this.$().text().trim(), '1234');
 });<% } else if (testType == 'unit') { %>

blueprints/helper-test/qunit-rfc-232-files/__root__/__testType__/__collection__/__name__-test.js

@@ -10,7 +10,7 @@ module('<%= friendlyTestName %>', function(hooks) {
   test('it renders', async function(assert) {
     this.set('inputValue', '1234');
 
-    await render(hbs`{{<%= dasherizedModuleName %> inputValue}}`);
+    await render(hbs`{{<%= dasherizedModuleName %> this.inputValue}}`);
 
     assert.dom(this.element).hasText('1234');
   });

node-tests/fixtures/helper-test/integration.js

@@ -9,7 +9,7 @@ moduleForComponent('foo/bar-baz', 'helper:foo/bar-baz', {
 test('it renders', function(assert) {
   this.set('inputValue', '1234');
 
-  this.render(hbs`{{foo/bar-baz inputValue}}`);
+  this.render(hbs`{{foo/bar-baz this.inputValue}}`);
 
   assert.equal(this.$().text().trim(), '1234');
 });

node-tests/fixtures/helper-test/mocha-0.12.js

@@ -19,7 +19,7 @@ describe('Integration | Helper | foo/bar-baz', function() {
     // `);
     this.set('inputValue', '1234');
 
-    this.render(hbs`{{foo/bar-baz inputValue}}`);
+    this.render(hbs`{{foo/bar-baz this.inputValue}}`);
 
     expect(this.$().text().trim()).to.equal('1234');
   });

node-tests/fixtures/helper-test/mocha-rfc232.js

@@ -11,7 +11,7 @@ describe('Integration | Helper | foo/bar-baz', function() {
   it('renders', async function() {
     this.set('inputValue', '1234');
 
-    await render(hbs`{{foo/bar-baz inputValue}}`);
+    await render(hbs`{{foo/bar-baz this.inputValue}}`);
 
     expect(this.element.textContent.trim()).to.equal('1234');
   });

node-tests/fixtures/helper-test/mocha.js

@@ -19,7 +19,7 @@ describeComponent('foo/bar-baz', 'helper:foo/bar-baz',
       // `);
       this.set('inputValue', '1234');
 
-      this.render(hbs`{{foo/bar-baz inputValue}}`);
+      this.render(hbs`{{foo/bar-baz this.inputValue}}`);
 
       expect(this.$().text().trim()).to.equal('1234');
     });

node-tests/fixtures/helper-test/rfc232.js

@@ -10,7 +10,7 @@ module('Integration | Helper | foo/bar-baz', function(hooks) {
   test('it renders', async function(assert) {
     this.set('inputValue', '1234');
 
-    await render(hbs`{{foo/bar-baz inputValue}}`);
+    await render(hbs`{{foo/bar-baz this.inputValue}}`);
 
     assert.dom(this.element).hasText('1234');
   });