Add predicate methods for specs and stop testing internals

Library/Homebrew/formula.rb

@@ -65,6 +65,18 @@ class Formula
     end
   end
 
+  def stable?
+    active_spec == stable
+  end
+
+  def devel?
+    active_spec == devel
+  end
+
+  def head?
+    active_spec == head
+  end
+
   def bottle
     Bottle.new(self, active_spec.bottle_specification) if active_spec.bottled?
   end

Library/Homebrew/formula_installer.rb

@@ -437,9 +437,10 @@ class FormulaInstaller
     args << "--cc=#{ARGV.cc}" if ARGV.cc
     args << "--env=#{ARGV.env}" if ARGV.env
 
-    case formula.active_spec
-    when formula.head  then args << "--HEAD"
-    when formula.devel then args << "--devel"
+    if formula.head?
+      args << "--HEAD"
+    elsif formula.devel?
+      args << "--devel"
     end
 
     formula.options.each do |opt|

Library/Homebrew/test/test_formula.rb

@@ -91,7 +91,7 @@ class FormulaTests < Homebrew::TestCase
     f.rack.rmtree
   end
 
-  def test_installed_prefix_head_active_spec
+  def test_installed_prefix_head
     f = formula("test", Pathname.new(__FILE__).expand_path, :head) do
       head 'foo'
       devel do
@@ -103,7 +103,7 @@ class FormulaTests < Homebrew::TestCase
     assert_equal prefix, f.installed_prefix
   end
 
-  def test_installed_prefix_devel_active_spec
+  def test_installed_prefix_devel
     f = formula("test", Pathname.new(__FILE__).expand_path, :devel) do
       head 'foo'
       devel do
@@ -171,7 +171,7 @@ class FormulaTests < Homebrew::TestCase
 
     assert_equal 'http://example.com', f.homepage
     assert_version_equal '0.1', f.version
-    assert_equal f.stable, f.active_spec
+    assert_predicate f, :stable?
 
     assert_instance_of SoftwareSpec, f.stable
     assert_instance_of SoftwareSpec, f.devel

Library/Homebrew/test/test_formula_spec_selection.rb

@@ -2,115 +2,98 @@ require 'testing_env'
 require 'formula'
 
 class FormulaSpecSelectionTests < Homebrew::TestCase
-  def assert_spec_selected(spec)
-    assert_equal @_f.send(spec), @_f.active_spec
-  end
-
-  def assert_spec_unset(spec)
-    assert_nil @_f.send(spec)
-  end
-
   def test_selects_stable_by_default
-    formula do
-      url 'foo-1.0'
-      devel { url 'foo-1.1a' }
-      head 'foo'
-    end
+    f = formula {
+      url "foo-1.0"
+      devel { url "foo-1.1a" }
+      head "foo"
+    }
 
-    assert_spec_selected :stable
+    assert_predicate f, :stable?
   end
 
   def test_selects_stable_when_exclusive
-    formula do
-      url 'foo-1.0'
-    end
-
-    assert_spec_selected :stable
+    f = formula { url "foo-1.0" }
+    assert_predicate f, :stable?
   end
 
   def test_selects_devel_before_head
-    formula do
-      devel { url 'foo-1.1a' }
-      head 'foo'
-    end
+    f = formula {
+      devel { url "foo-1.1a" }
+      head "foo"
+    }
 
-    assert_spec_selected :devel
+    assert_predicate f, :devel?
   end
 
   def test_selects_devel_when_exclusive
-    formula do
-      devel { url 'foo-1.1a' }
-    end
-
-    assert_spec_selected :devel
+    f = formula { devel { url "foo-1.1a" } }
+    assert_predicate f, :devel?
   end
 
   def test_selects_head_when_exclusive
-    formula do
-      head 'foo'
-    end
-
-    assert_spec_selected :head
+    f = formula { head "foo" }
+    assert_predicate f, :head?
   end
 
   def test_incomplete_spec_not_selected
-    formula do
+    f = formula {
       sha1 TEST_SHA1
-      version '1.0'
-      head 'foo'
-    end
+      version "1.0"
+      head "foo"
+    }
 
-    assert_spec_selected :head
+    assert_predicate f, :head?
   end
 
   def test_incomplete_stable_not_set
-    formula do
+    f = formula {
       sha1 TEST_SHA1
-      devel { url 'foo-1.1a' }
-      head 'foo'
-    end
+      devel { url "foo-1.1a" }
+      head "foo"
+    }
 
-    assert_spec_unset :stable
-    assert_spec_selected :devel
+    assert_nil f.stable
+    assert_predicate f, :devel?
   end
 
   def test_selects_head_when_requested
-    formula("test", Pathname.new(__FILE__).expand_path, :head) do
-      url 'foo-1.0'
-      devel { url 'foo-1.1a' }
-      head 'foo'
-    end
+    f = formula("test", Pathname.new(__FILE__).expand_path, :head) {
+      url "foo-1.0"
+      devel { url "foo-1.1a" }
+      head "foo"
+    }
 
-    assert_spec_selected :head
+    assert_predicate f, :head?
   end
 
   def test_selects_devel_when_requested
-    formula("test", Pathname.new(__FILE__).expand_path, :devel) do
-      url 'foo-1.0'
-      devel { url 'foo-1.1a' }
-      head 'foo'
-    end
+    f = formula("test", Pathname.new(__FILE__).expand_path, :devel) {
+      url "foo-1.0"
+      devel { url "foo-1.1a" }
+      head "foo"
+    }
 
-    assert_spec_selected :devel
+    assert_predicate f, :devel?
   end
 
   def test_incomplete_devel_not_set
-    formula do
-      url 'foo-1.0'
-      devel { version '1.1a' }
-      head 'foo'
-    end
+    f = formula {
+      url "foo-1.0"
+      devel { version "1.1a" }
+      head "foo"
+    }
 
-    assert_spec_unset :devel
-    assert_spec_selected :stable
+    assert_nil f.devel
+    assert_predicate f, :stable?
   end
 
   def test_does_not_raise_for_missing_spec
-    formula("test", Pathname.new(__FILE__).expand_path, :devel) do
-      url 'foo-1.0'
-      head 'foo'
-    end
+    f = formula("test", Pathname.new(__FILE__).expand_path, :devel) {
+      url "foo-1.0"
+      head "foo"
+    }
 
-    assert_spec_selected :stable
+    assert_predicate f, :stable?
   end
 end