fixup! Allow disabling of all network accesses

Author: ibbem

spec/client_spec.rb

@@ -39,13 +39,12 @@
     end.to raise_error(described_class::BadCredentialsError)
   end
 
-  before { ENV["PAGES_DISABLE_NETWORK"] = nil }
-
   it "supresses network accesses if requested" do
     WebMock.disable_net_connect!
 
-    ENV["PAGES_DISABLE_NETWORK"] = "1"
-    expect(subject.contributors("jekyll/github-metadata")).to be(false)
+    with_env("PAGES_DISABLE_NETWORK", "1") do
+      expect(subject.contributors("jekyll/github-metadata")).to be(false)
+    end
   end
 
   it "allows network accesses by default" do