Add spec for License#data_filename

The spec for License#data_filename was missing, this change will add the
missing test coverage for the method.

ee/spec/models/license_spec.rb

@@ -755,6 +755,24 @@ RSpec.describe License do
     end
   end
 
+  describe "#data_filename" do
+    subject { license.data_filename }
+
+    context 'when licensee includes company information' do
+      let(:gl_license) do
+        build(:gitlab_license, licensee: { 'Company' => ' Example & Partner Inc. 2 ', 'Name' => 'User Example' })
+      end
+
+      it { is_expected.to eq('ExamplePartnerInc2.gitlab-license') }
+    end
+
+    context 'when licensee does not include company information' do
+      let(:gl_license) { build(:gitlab_license, licensee: { 'Name' => 'User Example' }) }
+
+      it { is_expected.to eq('UserExample.gitlab-license') }
+    end
+  end
+
   describe "#md5" do
     it "returns the same MD5 for licenses with carriage returns and those without" do
       other_license = build(:license, data: license.data.gsub("\n", "\r\n"))