add more specs

lib/api/project_import.rb

@@ -17,7 +17,6 @@ module API
     end
     resource :projects, requirements: { id: %r{[^/]+} } do
-
       params do
         requires :path, type: String, desc: 'The new project path and name'
         optional :namespace, type: String, desc: 'The ID or name of the namespace that the project will be imported into. Defaults to the user namespace.'
@@ -30,11 +29,10 @@ module API
         render_api_error!('The file is invalid', 400) unless file_is_valid?
         namespace = import_params[:namespace]
-
-        namespace = if namespace && namespace =~ /^\d+$/
-                      Namespace.find_by(id: namespace)
-                    elsif namespace.blank?
+        namespace = if namespace.blank?
                       current_user.namespace
+                    elsif namespace =~ /^\d+$/
+                      Namespace.find_by(id: namespace)
                     else
                       Namespace.find_by_path_or_name(namespace)
                     end
@@ -43,7 +41,7 @@ module API
                                              file: import_params[:file]['tempfile'])
         project = ::Projects::GitlabProjectsImportService.new(current_user, project_params).execute
-        render_api_error!(project&.full_messages&.first, 400) unless project&.saved?
+        render_api_error!(project.errors.full_messages&.first, 400) unless project.saved?
         present project, with: Entities::ProjectImportStatus
       end

spec/requests/api/project_import_spec.rb

@@ -16,13 +16,44 @@ describe API::ProjectImport do
   end
   describe 'POST /projects/import' do
-    it 'schedules an import' do
+    it 'schedules an import using a namespace' do
       expect_any_instance_of(Project).to receive(:import_schedule)
+      expect(Gitlab::ImportExport::ProjectCreator).to receive(:new).with(namespace.id, any_args).and_call_original
       post api('/projects/import', user), path: 'test-import', file: fixture_file_upload(file), namespace: namespace.full_path
       expect(response).to have_gitlab_http_status(201)
     end
+
+    it 'schedules an import at the user namespace level' do
+      expect_any_instance_of(Project).to receive(:import_schedule)
+      expect(Gitlab::ImportExport::ProjectCreator).to receive(:new).with(user.namespace.id, any_args).and_call_original
+
+      post api('/projects/import', user), path: 'test-import2', file: fixture_file_upload(file)
+
+      expect(response).to have_gitlab_http_status(201)
+    end
+
+    it 'does not schedule an import if the user has no permission to the namespace' do
+      expect_any_instance_of(Project).not_to receive(:import_schedule)
+
+      post(api('/projects/import', create(:user)),
+           path: 'test-import3',
+           file: fixture_file_upload(file),
+           namespace: namespace.full_path)
+
+      expect(response).to have_gitlab_http_status(400)
+      expect(json_response['message']).to eq('Namespace is not valid')
+    end
+
+    it 'does not schedule an import if the user uploads no valid file' do
+      expect_any_instance_of(Project).not_to receive(:import_schedule)
+
+      post api('/projects/import', user), path: 'test-import3', file: './random/test'
+
+      expect(response).to have_gitlab_http_status(400)
+      expect(json_response['error']).to eq('file is invalid')
+    end
   end
   describe 'GET /projects/:id/import' do