Fix constant redefinitions in tests

spec/bugsnag_spec.rb

@@ -33,7 +33,6 @@ def require(path)
     end
 
     it 'attempts to load integrations' do
-      Kernel::REQUIRED = []
       ENV["BUGSNAG_DISABLE_AUTOCONFIGURE"] = nil
       load "./lib/bugsnag.rb"
       Bugsnag::INTEGRATIONS.each do |integration|
@@ -42,36 +41,31 @@ def require(path)
     end
 
     it 'does not load integrations when BUGSNAG_DISABLE_AUTOCONFIGURE is true' do
-      Kernel::REQUIRED = []
       ENV["BUGSNAG_DISABLE_AUTOCONFIGURE"] = 'true'
       load "./lib/bugsnag.rb"
       expect(Kernel::REQUIRED).to eq(["bugsnag/integrations/rack"])
     end
 
     it 'loads all integrations if requested' do
-      Kernel::REQUIRED = []
-      expect(Kernel::REQUIRED).to eq([])
       Bugsnag.load_integrations
       Bugsnag::INTEGRATIONS.each do |integration|
         expect(Kernel::REQUIRED).to include("bugsnag/integrations/#{integration}")
       end
     end
 
-    it 'loads singular integrations' do
-      Kernel::REQUIRED = []
-      expect(Kernel::REQUIRED).to eq([])
-      Bugsnag::INTEGRATIONS.each do |integration|
-        Kernel::REQUIRED = []
+    Bugsnag::INTEGRATIONS.each do |integration|
+      it "loads #{integration}" do
         Bugsnag.load_integration(integration)
         expect(Kernel::REQUIRED).to include("bugsnag/integrations/#{integration}")
       end
     end
 
-    it 'loads railtie for :rails or :railtie' do
-      Kernel::REQUIRED = []
+    it 'loads railtie for rails' do
       Bugsnag.load_integration(:rails)
       expect(Kernel::REQUIRED).to include("bugsnag/integrations/railtie")
-      Kernel::REQUIRED = []
+    end
+
+    it 'loads railtie for railtie' do
       Bugsnag.load_integration(:railtie)
       expect(Kernel::REQUIRED).to include("bugsnag/integrations/railtie")
     end