Detect versions in tag specs

Closes Homebrew/homebrew#18300.
Closes Homebrew/homebrew#20891.

1 files changed, 6 insertions, 0 deletions

diff --git a/Library/Homebrew/test/test_software_spec.rb b/Library/Homebrew/test/test_software_spec.rb
index 0090ec099..f3eed4769 100644
--- a/Library/Homebrew/test/test_software_spec.rb
+++ b/Library/Homebrew/test/test_software_spec.rb
@@ -60,6 +60,12 @@ class SoftwareSpecTests < Test::Unit::TestCase
     assert_instance_of scheme, @spec.version
   end
 
+  def test_version_from_tag
+    @spec.url('http://foo.com/bar-1.0.tar.gz', :tag => 'v1.0.2')
+    assert_version_equal '1.0.2', @spec.version
+    assert @spec.version.detected_from_url?
+  end
+
   def test_mirrors
     assert_empty @spec.mirrors
     @spec.mirror('foo')