Add a test

Library/Homebrew/cmd/search.rb

@@ -48,7 +48,7 @@ module Homebrew
         result = Formulary.factory(query).name
         results = Array(result)
       rescue FormulaUnavailableError
-        results = search_taps(query)
+        results = search_taps(query.split('/')[-1])
       end
 
       puts Formatter.columns(results) unless results.empty?

Library/Homebrew/test/cmd/search_spec.rb

@@ -1,6 +1,7 @@
 describe "brew search", :integration_test do
   before(:each) do
     setup_test_formula "testball"
+    setup_remote_tap "caskroom/cask/test"
   end
 
   it "lists all available Formulae when no argument is given" do
@@ -24,6 +25,13 @@ describe "brew search", :integration_test do
       .and be_a_success
   end
 
+  it "falls back to a tap search when no formula is found" do
+    expect { brew "search", "caskroom/cask/firefox" }
+      .to output(/firefox/).to_stdout
+      .and not_to_output.to_stderr
+      .and be_a_success
+  end
+
   describe "--desc" do
     let(:desc_cache) { HOMEBREW_CACHE/"desc_cache.json" }