test/abstract_command_spec: rename cat to fix completions test

Signed-off-by: Michael Cho <michael@michaelcho.dev>

Library/Homebrew/test/abstract_command_spec.rb

@@ -5,37 +5,37 @@
 RSpec.describe Homebrew::AbstractCommand do
   describe "subclasses" do
     before do
-      cat = Class.new(described_class) do
+      test_cat = Class.new(described_class) do
         cmd_args do
           switch "--foo"
           flag "--bar="
         end
         def run; end
       end
-      stub_const("Cat", cat)
+      stub_const("TestCat", test_cat)
     end
 
     describe "parsing args" do
       it "parses valid args" do
-        expect { Cat.new(["--foo"]).run }.not_to raise_error
+        expect { TestCat.new(["--foo"]).run }.not_to raise_error
       end
 
       it "allows access to args" do
-        expect(Cat.new(["--bar", "baz"]).args[:bar]).to eq("baz")
+        expect(TestCat.new(["--bar", "baz"]).args[:bar]).to eq("baz")
       end
 
       it "raises on invalid args" do
-        expect { Cat.new(["--bat"]) }.to raise_error(OptionParser::InvalidOption)
+        expect { TestCat.new(["--bat"]) }.to raise_error(OptionParser::InvalidOption)
       end
     end
 
     describe "command names" do
       it "has a default command name" do
-        expect(Cat.command_name).to eq("cat")
+        expect(TestCat.command_name).to eq("test-cat")
       end
 
       it "can lookup command" do
-        expect(described_class.command("cat")).to be(Cat)
+        expect(described_class.command("test-cat")).to be(TestCat)
       end
 
       describe "when command name is overridden" do