gpm 1.4.0

- use depends_on "go" instead of a custom requirement
- clean up the test

Closes #2596.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/gpm.rb

@@ -1,18 +1,8 @@
-class GoRequirement < Requirement
-  fatal true
-  default_formula "go"
-  satisfy { which "go" }
-
-  def message
-    "Go is required to use gpm."
-  end
-end
-
 class Gpm < Formula
   desc "Barebones dependency manager for Go"
   homepage "https://github.com/pote/gpm"
-  url "https://github.com/pote/gpm/archive/v1.3.2.tar.gz"
-  sha256 "c79b10c9f13d9cc79f2dcf08323daac86b9bb50cf7b84924ebeb28e98334c0ae"
+  url "https://github.com/pote/gpm/archive/v1.4.0.tar.gz"
+  sha256 "2e213abbb1a12ecb895c3f02b74077d3440b7ae3221b4b524659c2ea9065b02a"
 
   bottle do
     cellar :any_skip_relocation
@@ -22,7 +12,7 @@ class Gpm < Formula
     sha256 "0efe4d9fbd5207cff83169a571c7ddb815b434e99b206fc9989e9a309436451f" => :mountain_lion
   end
 
-  depends_on GoRequirement
+  depends_on "go"
 
   def install
     system "./configure", "--prefix=#{prefix}"
@@ -30,26 +20,14 @@ class Gpm < Formula
   end
 
   test do
-    Pathname("Godeps").write "github.com/pote/gpm-testing-package v6.1"
-
     ENV["GOPATH"] = testpath
+    (testpath/"Godeps").write("github.com/pote/gpm-testing-package v6.1")
     system bin/"gpm", "install"
-
-    Pathname("go_code.go").write <<-EOS.undent
+    (testpath/"go_code.go").write <<-EOS.undent
       package main
-
-      import (
-              "fmt"
-              "github.com/pote/gpm-testing-package"
-      )
-
-      func main() {
-              fmt.Print(gpm_testing_package.Version())
-      }
+      import ("fmt"; "github.com/pote/gpm-testing-package")
+      func main() { fmt.Print(gpm_testing_package.Version()) }
     EOS
-
-    out = `go run go_code.go`
-    assert_equal "v6.1", out
-    assert_equal 0, $?.exitstatus
+    assert_equal "v6.1", shell_output("go run go_code.go")
   end
 end