fix(@schematics/angular): include the type separator in the class spec import

class spec template imports `'./<name><type>'`, and `type` reaches it without leading dot since class schematic moved to `generateFromFiles`
so `ng g class user --type=model` writes `user.model.spec.ts` with `import { User } from './usermodel'` and generated spec does not compile
template now adds dot only when type is set, matching `__type__` file name token

(cherry picked from commit 4a59335)

Author: thekhegay

packages/schematics/angular/class/files/__name@dasherize__.__type__.spec.ts.template

@@ -1,4 +1,4 @@
-import { <%= classify(name) %> } from './<%= dasherize(name) %><%= type %>';
+import { <%= classify(name) %> } from './<%= dasherize(name) %><%= type ? '.' + type : '' %>';
 
 describe('<%= classify(name) %>', () => {
   it('should create an instance', () => {

packages/schematics/angular/class/index_spec.ts

@@ -74,6 +74,14 @@ describe('Class Schematic', () => {
     expect(tree.files).toContain('/projects/bar/src/app/foo.model.ts');
   });
 
+  it('should import the class from the typed file in the spec file', async () => {
+    const options = { ...defaultOptions, type: 'model', skipTests: false };
+
+    const tree = await schematicRunner.runSchematic('class', options, appTree);
+    const specContent = tree.readContent('/projects/bar/src/app/foo.model.spec.ts');
+    expect(specContent).toContain("import { Foo } from './foo.model';");
+  });
+
   it('should split the name to name & type with split on "."', async () => {
     const options = { ...defaultOptions, name: 'foo.model' };
     const tree = await schematicRunner.runSchematic('class', options, appTree);