Use named subjects in specs

spec/jobs/scheduled/flag_quarantined_uploads_spec.rb

@@ -4,51 +4,49 @@
 
 describe Jobs::FlagQuarantinedUploads do
   describe "#execute" do
+    subject(:execute) { described_class.new.execute({}) }
+
     let(:scan_message) { "Win.Test.EICAR_HDB-1 FOUND" }
     let(:upload) { Fabricate(:upload) }
-
-    before do
-      SiteSetting.flag_malicious_uploads = true
-      @scanned_upload =
-        ScannedUpload.create!(upload: upload, quarantined: true, scan_result: scan_message)
+    let(:reviewable_upload) { ReviewableUpload.find_by(target: upload) }
+    let!(:scanned_upload) do
+      ScannedUpload.create!(upload: upload, quarantined: true, scan_result: scan_message)
     end
 
-    it "flags the upload if it was previously quarantined" do
-      subject.execute({})
-
-      reviewable_upload = ReviewableUpload.find_by(target: upload)
+    before { SiteSetting.flag_malicious_uploads = true }
 
-      expect(reviewable_upload).to be_present
+    it "flags the upload if it was previously quarantined" do
+      execute
       expect(reviewable_upload.payload["scan_message"]).to eq(scan_message)
     end
 
-    it "does nothing if the flag_malicious_uploads flag is disabled" do
-      SiteSetting.flag_malicious_uploads = false
-
-      subject.execute({})
-      reviewable_upload = ReviewableUpload.find_by(target: upload)
+    context "when the flag_malicious_uploads flag is disabled" do
+      before { SiteSetting.flag_malicious_uploads = false }
 
-      expect(reviewable_upload).to be_nil
+      it "does nothing" do
+        execute
+        expect(reviewable_upload).to be_nil
+      end
     end
 
-    it "does nothing if a reviewable already exists" do
-      @scanned_upload.flag_upload
-
-      subject.execute({})
+    context "when a reviewable already exists" do
+      before { scanned_upload.flag_upload }
 
-      reviewable_upload = ReviewableUpload.find_by(target: upload)
-      scores = reviewable_upload.reviewable_scores
+      it "does nothing" do
+        execute
 
-      expect(scores.size).to eq(1)
+        expect(reviewable_upload.reviewable_scores.size).to eq(1)
+      end
     end
 
-    it "does nothing if the scanned upload is not quarantined" do
-      @scanned_upload.update!(quarantined: false)
+    context "when the scanned upload is not quarantined" do
+      before { scanned_upload.update!(quarantined: false) }
 
-      subject.execute({})
-      reviewable_upload = ReviewableUpload.find_by(target: upload)
+      it "does nothing" do
+        execute
 
-      expect(reviewable_upload).to be_nil
+        expect(reviewable_upload).to be_nil
+      end
     end
   end
 end