Fix Import/Export error checking versions

CHANGELOG

@@ -56,6 +56,9 @@ v 8.11.0 (unreleased)
   - Fix RequestProfiler::Middleware error when code is reloaded in development
   - Catch what warden might throw when profiling requests to re-throw it
 
+v 8.10.4 (unreleased)
+  - Fix Import/Export error checking versions
+
 v 8.10.3
   - Fix Import/Export issue importing milestones and labels not associated properly. !5426
   - Fix timing problems running imports on production. !5523

lib/gitlab/import_export/version_checker.rb

@@ -25,7 +25,7 @@ module Gitlab
 
       def verify_version!(version)
         if Gem::Version.new(version) > Gem::Version.new(Gitlab::ImportExport.version)
-          raise Gitlab::ImportExport::Error("Import version mismatch: Required <= #{Gitlab::ImportExport.version} but was #{version}")
+          raise Gitlab::ImportExport::Error.new("Import version mismatch: Required <= #{Gitlab::ImportExport.version} but was #{version}")
         else
           true
         end

spec/lib/gitlab/import_export/version_checker_spec.rb

+require 'spec_helper'
+
+describe Gitlab::ImportExport::VersionChecker, services: true do
+  describe 'bundle a project Git repo' do
+    let(:shared) { Gitlab::ImportExport::Shared.new(relative_path: '') }
+    let(:version) { Gitlab::ImportExport.version }
+
+    before do
+      allow(File).to receive(:open).and_return(version)
+    end
+
+    it 'returns true if Import/Export have the same version' do
+      expect(described_class.check!(shared: shared)).to be true
+    end
+
+    context 'newer version' do
+      let(:version) { '900.0'}
+
+      it 'returns false if export version is newer' do
+        expect(described_class.check!(shared: shared)).to be false
+      end
+
+      it 'shows the correct error message' do
+        described_class.check!(shared: shared)
+
+        expect(shared.errors.first).to eq("Import version mismatch: Required <= #{Gitlab::ImportExport.version} but was #{version}")
+      end
+    end
+  end
+end