Fix up some assertions

Library/Homebrew/test/test_build_options.rb

@@ -55,10 +55,10 @@ class BuildOptionsTests < Test::Unit::TestCase
   end
 
   def test_opposite_of
-    assert @build.opposite_of(Option.new("with-foo")) == Option.new("without-foo")
+    assert_equal Option.new("without-foo"), @build.opposite_of(Option.new("with-foo"))
-    assert @build.opposite_of("without-foo") == Option.new("with-foo")
+    assert_equal Option.new("with-foo"), @build.opposite_of("without-foo")
-    assert @build.opposite_of(Option.new("enable-spam")) == Option.new("disable-spam")
+    assert_equal Option.new("disable-spam"), @build.opposite_of(Option.new("enable-spam"))
-    assert @build.opposite_of("disable-beer") == Option.new("enable-beer")
+    assert_equal Option.new("enable-beer"), @build.opposite_of("disable-beer")
   end
 
   def test_has_opposite_of?

Library/Homebrew/test/test_options.rb

@@ -21,7 +21,7 @@ class OptionTests < Test::Unit::TestCase
     assert_not_equal bar, @option
     assert @option.eql?(foo)
     assert !@option.eql?(bar)
-    assert bar < foo
+    assert_operator bar, :<, foo
   end
 
   def test_strips_leading_dashes

Library/Homebrew/test/test_stdlib.rb

@@ -52,14 +52,14 @@ class CxxStdlibTests < Test::Unit::TestCase
   end
 
   def test_type_string_formatting
-    assert_equal @clang.type_string, 'libstdc++'
+    assert_equal "libstdc++", @clang.type_string
-    assert_equal @lcxx.type_string, 'libc++'
+    assert_equal "libc++", @lcxx.type_string
   end
 
   def test_constructing_from_tab
     stdlib = Tab.dummy_tab.cxxstdlib
-    assert_equal stdlib.compiler, :clang
+    assert_equal :clang, stdlib.compiler
-    assert_equal stdlib.type, nil
+    assert_nil stdlib.type
   end
 
   def test_compatibility_for_non_cxx_software