Add tests for ClambyScanner

Tests the configuration of ClamAV in environments where it's installed;
otherwise, stubs Clamby to ensure ClambyScanner matches the API expected
by hydra-works (< 2.0.0).

spec/lib/clamby_scanner_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+require 'clamby_scanner'
+
+RSpec.describe ClambyScanner do
+  let(:infected_file) { Rails.root.join('spec', 'fixtures', 'virus_checking', 'virus_check.txt').to_s }
+  let(:clean_file)    { Rails.root.join('spec', 'fixtures', 'miranda', 'miranda_thesis.pdf').to_s }
+
+  before do
+    # Stub Clamby to return true if filename includes "virus"
+    # in environments without ClamAV installed - e.g. CircleCI
+    unless Clamby.scanner_exists?
+      class_double("Clamby").as_stubbed_const
+      allow(Clamby).to receive(:virus?) { |args| args.match?(/virus/i) }
+    end
+  end
+
+  it 'detects viruses' do
+    expect(described_class.infected?(infected_file)).to be true
+  end
+
+  it 'passes clean files' do
+    expect(described_class.infected?(clean_file)).to be false
+  end
+
+  it 'is handled natively in hydra-works >= 2.0.0' do
+    pending 'hydra-works >= v2.0.0'
+    native = Gem::Version.new(Hydra::Works::VERSION) >= Gem::Version.new('2.0.0')
+    expect(native).to be true
+  end
+end

spec/rails_helper.rb

@@ -123,11 +123,6 @@
   #   ActiveFedora::Cleaner.clean!
   # end
 
-  config.before do
-    class_double("Clamby").as_stubbed_const
-    allow(Clamby).to receive(:virus?).and_return(false)
-  end
-
   config.include Devise::Test::ControllerHelpers, type: :controller
   config.include Devise::Test::IntegrationHelpers, type: :request
   config.include Warden::Test::Helpers, type: :system