[#322] Add spec for contribution guide on github wiki

.template/spec/addons/base/github/template_spec.rb

@@ -21,7 +21,9 @@
 
   # TODO: Can't test this as it is now ignored by `.dockerignore`
   xit 'modifies the README.md' do
-    expect(file('README.md')).not_to contain('## Get Started')
+    expect(file('README.md')).to contain('## Documentation')
+
+    expect(file('README.md')).not_to contain('## Getting Started')
     expect(file('README.md')).not_to contain('## Testing')
     expect(file('README.md')).not_to contain('## CI/CD')
   end
@@ -65,11 +67,24 @@
     it 'exists' do
       expect(file('.github/wiki/Testing.md')).to exist
     end
+
+    it 'contains the correct content extracted from README.md' do
+      expect(file('.github/wiki/Testing.md')).to contain('### Docker-based tests on the CI server')
+      expect(file('.github/wiki/Testing.md')).to contain('### Test')
+      expect(file('.github/wiki/Testing.md')).to contain('### Automated Code Review Setup')
+    end
   end
 
-  describe '.github/wiki/Contribution-Guide.md' do
+  describe './github/wiki/Contribution-Guide.md' do 
     it 'exists' do
       expect(file('.github/wiki/Contribution-Guide.md')).to exist
     end
+
+    it 'contains the correct content extracted from README.md' do
+      expect(file('.github/wiki/Contribution-Guide.md')).to contain('## How to contribute')
+      expect(file('.github/wiki/Contribution-Guide.md')).to contain('### Template structure')
+      expect(file('.github/wiki/Contribution-Guide.md')).to contain('### Template specs')
+      expect(file('.github/wiki/Contribution-Guide.md')).to contain('### Template Strings')
+    end
   end
 end