formulary: fix to_rack for fully-scoped references

Fixes the case where I have `mysql56` installed but do
`brew uninstall foo/bar/mysql56` which isn't a valid formula.

Fixes https://github.com/Homebrew/legacy-homebrew/issues/39883.

1 files changed, 9 insertions, 0 deletions

diff --git a/Library/Homebrew/test/test_formulary.rb b/Library/Homebrew/test/test_formulary.rb
index 7c7ad3e74..7a3ab65e0 100644
--- a/Library/Homebrew/test/test_formulary.rb
+++ b/Library/Homebrew/test/test_formulary.rb
@@ -111,6 +111,15 @@ class FormularyFactoryTest < Homebrew::TestCase
   def test_load_from_contents
     assert_kind_of Formula, Formulary.from_contents(@name, @path, @path.read)
   end
+
+  def test_to_rack
+    assert_equal HOMEBREW_CELLAR/@name, Formulary.to_rack(@name)
+    (HOMEBREW_CELLAR/@name).mkpath
+    assert_equal HOMEBREW_CELLAR/@name, Formulary.to_rack(@name)
+    assert_raises(TapFormulaUnavailableError) { Formulary.to_rack("a/b/#{@name}") }
+  ensure
+    FileUtils.rm_rf HOMEBREW_CELLAR/@name
+  end
 end
 
 class FormularyTapFactoryTest < Homebrew::TestCase