Add view tests for no-project messages

The Project list partial can render a variety of messages related to
insufficient data. This adds a view spec to cover those messages.

spec/views/shared/projects/_list.html.haml_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'shared/projects/_list' do
+  let(:group) { create(:group) }
+
+  before do
+    allow(view).to receive(:projects).and_return(projects)
+    allow(view).to receive(:project_list_cache_key).and_return('fake_cache_key')
+  end
+
+  context 'with projects' do
+    let(:projects) { build_stubbed_list(:project, 1) }
+
+    it 'renders the list of projects' do
+      render
+
+      projects.each do |project|
+        expect(rendered).to have_content(project.name)
+      end
+    end
+  end
+
+  context 'without projects' do
+    let(:projects) { [] }
+
+    context 'when @contributed_projects is set' do
+      context 'and is empty' do
+        before do
+          @contributed_projects = []
+        end
+
+        it 'renders a no-content message' do
+          render
+
+          expect(rendered).to have_content(s_('UserProfile|This user hasn\'t contributed to any projects'))
+        end
+      end
+    end
+
+    context 'when @starred_projects is set' do
+      context 'and is empty' do
+        before do
+          @starred_projects = []
+        end
+
+        it 'renders a no-content message' do
+          render
+
+          expect(rendered).to have_content(s_('UserProfile|This user hasn\'t starred any projects'))
+        end
+      end
+    end
+
+    context 'and without a special instance variable' do
+      context 'for an explore_page' do
+        before do
+          allow(view).to receive(:explore_page).and_return(true)
+        end
+
+        it 'renders a no-content message' do
+          render
+
+          expect(rendered).to have_content(s_('UserProfile|Explore public groups to find projects to contribute to.'))
+        end
+      end
+
+      context 'for a non-explore page' do
+        it 'renders a no-content message' do
+          render
+
+          expect(rendered).to have_content(s_('UserProfile|This user doesn\'t have any personal projects'))
+        end
+      end
+    end
+  end
+end