Resolve logic error for non ci config files

- we need to check if this is a config file before
  we try and check valid? on it as that method
  does not exist on all files.

app/helpers/blob_helper.rb

@@ -344,8 +344,8 @@ module BlobHelper
 
   def show_suggest_pipeline_creation_celebration?
     experiment_enabled?(:suggest_pipeline) &&
-      @blob.auxiliary_viewer.valid?(project: @project, sha: @commit.sha, user: current_user) &&
       @blob.path == Gitlab::FileDetector::PATTERNS[:gitlab_ci] &&
+      @blob.auxiliary_viewer.valid?(project: @project, sha: @commit.sha, user: current_user) &&
       @project.uses_default_ci_config? &&
       cookies[suggest_pipeline_commit_cookie_name].present?
   end

spec/helpers/blob_helper_spec.rb

@@ -204,7 +204,6 @@ describe BlobHelper do
     end
 
     describe '#show_suggest_pipeline_creation_celebration?' do
-      let(:blob) { fake_blob(path: Gitlab::FileDetector::PATTERNS[:gitlab_ci]) }
       let(:current_user) { create(:user) }
 
       before do
@@ -212,52 +211,68 @@ describe BlobHelper do
         assign(:blob, blob)
         assign(:commit, double('Commit', sha: 'whatever'))
         helper.request.cookies["suggest_gitlab_ci_yml_commit_#{project.id}"] = 'true'
-        allow(blob).to receive(:auxiliary_viewer).and_return(double('viewer', valid?: true))
         allow(helper).to receive(:current_user).and_return(current_user)
       end
 
-      context 'experiment enabled' do
-        before do
-          allow(helper).to receive(:experiment_enabled?).and_return(true)
-        end
-
-        it 'is true' do
-          expect(helper.show_suggest_pipeline_creation_celebration?).to be_truthy
-        end
+      context 'when file is a pipeline config file' do
+        let(:data) { File.read(Rails.root.join('spec/support/gitlab_stubs/gitlab_ci.yml')) }
+        let(:blob) { fake_blob(path: Gitlab::FileDetector::PATTERNS[:gitlab_ci], data: data) }
 
-        context 'file is invalid format' do
+        context 'experiment enabled' do
           before do
-            allow(blob).to receive(:auxiliary_viewer).and_return(double('viewer', valid?: false))
+            allow(helper).to receive(:experiment_enabled?).and_return(true)
           end
 
-          it 'is false' do
-            expect(helper.show_suggest_pipeline_creation_celebration?).to be_falsey
+          it 'is true' do
+            expect(helper.show_suggest_pipeline_creation_celebration?).to be_truthy
           end
-        end
 
-        context 'path is not a ci file' do
-          before do
-            allow(blob).to receive(:path).and_return('something_bad')
+          context 'file is invalid format' do
+            let(:data) { 'foo' }
+
+            it 'is false' do
+              expect(helper.show_suggest_pipeline_creation_celebration?).to be_falsey
+            end
           end
 
-          it 'is false' do
-            expect(helper.show_suggest_pipeline_creation_celebration?).to be_falsey
+          context 'does not use the default ci config' do
+            before do
+              project.ci_config_path = 'something_bad'
+            end
+
+            it 'is false' do
+              expect(helper.show_suggest_pipeline_creation_celebration?).to be_falsey
+            end
+          end
+
+          context 'does not have the needed cookie' do
+            before do
+              helper.request.cookies.delete "suggest_gitlab_ci_yml_commit_#{project.id}"
+            end
+
+            it 'is false' do
+              expect(helper.show_suggest_pipeline_creation_celebration?).to be_falsey
+            end
           end
         end
 
-        context 'does not use the default ci config' do
+        context 'experiment disabled' do
           before do
-            project.ci_config_path = 'something_bad'
+            allow(helper).to receive(:experiment_enabled?).and_return(false)
           end
 
           it 'is false' do
             expect(helper.show_suggest_pipeline_creation_celebration?).to be_falsey
           end
         end
+      end
 
-        context 'does not have the needed cookie' do
+      context 'when file is not a pipeline config file' do
+        let(:blob) { fake_blob(path: 'LICENSE') }
+
+        context 'experiment enabled' do
           before do
-            helper.request.cookies.delete "suggest_gitlab_ci_yml_commit_#{project.id}"
+            allow(helper).to receive(:experiment_enabled?).and_return(true)
           end
 
           it 'is false' do
@@ -265,16 +280,6 @@ describe BlobHelper do
           end
         end
       end
-
-      context 'experiment disabled' do
-        before do
-          allow(helper).to receive(:experiment_enabled?).and_return(false)
-        end
-
-        it 'is false' do
-          expect(helper.show_suggest_pipeline_creation_celebration?).to be_falsey
-        end
-      end
     end
   end