Change name of TestClass in 2 spec files

Since qualified_domain_array_validator_spec.rb and
spec/models/concerns/safe_url_spec.rb used the same name for a Class,
they caused order dependent spec failures.

This commit renames both the TestClass in both specs.

spec/models/concerns/safe_url_spec.rb

@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe SafeUrl do
   describe '#safe_url' do
-    class TestClass
+    class SafeUrlTestClass
       include SafeUrl
 
       attr_reader :url
@@ -14,7 +14,7 @@ describe SafeUrl do
       end
     end
 
-    let(:test_class) { TestClass.new(url) }
+    let(:test_class) { SafeUrlTestClass.new(url) }
     let(:url) { 'http://example.com' }
 
     subject { test_class.safe_url }

spec/validators/qualified_domain_array_validator_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 describe QualifiedDomainArrayValidator do
-  class TestClass
+  class QualifiedDomainArrayValidatorTestClass
     include ActiveModel::Validations
 
     attr_accessor :domain_array
@@ -14,7 +14,7 @@ describe QualifiedDomainArrayValidator do
   end
 
   let!(:record) do
-    TestClass.new(['gitlab.com'])
+    QualifiedDomainArrayValidatorTestClass.new(['gitlab.com'])
   end
 
   subject { validator.validate(record) }