gpm: use full path of executable, use assertion to test output

Closes #29428.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/Library/Formula/gpm.rb b/Library/Formula/gpm.rb
index 21a5a5a46..18309c0af 100644
--- a/Library/Formula/gpm.rb
+++ b/Library/Formula/gpm.rb
@@ -33,7 +33,7 @@ class Gpm < Formula
     Pathname("Godeps").write "github.com/pote/gpm-testing-package v6.1"
 
     ENV["GOPATH"] = testpath
-    system "gpm", "install"
+    system bin/"gpm", "install"
 
     Pathname("go_code.go").write <<-EOS.undent
       package main
@@ -47,6 +47,9 @@ class Gpm < Formula
               fmt.Print(gpm_testing_package.Version())
       }
     EOS
-    `go run go_code.go` == "v6.1"
+
+    out = `go run go_code.go`
+    assert_equal "v6.1", out
+    assert_equal 0, $?.exitstatus
   end
 end