diff --git a/lib/quix/ext/pathname.rb b/lib/quix/ext/pathname.rb
index 57adde2..af026c1 100644
--- a/lib/quix/ext/pathname.rb
+++ b/lib/quix/ext/pathname.rb
@@ -58,9 +58,9 @@ def replace(open_flags_read = ["r"], open_flags_write = ["w"])
     }
   end
 
-  BINARY_ENCODING = RUBY_VERSION < "1.9" ? "" : ":ASCII-8BIT"
-  BINARY_READ_FLAGS = "rb" + BINARY_ENCODING
-  BINARY_WRITE_FLAGS = "wb" + BINARY_ENCODING
+  binary_encoding = RUBY_VERSION < "1.9" ? "" : ":ASCII-8BIT"
+  BINARY_READ_FLAGS = "rb" + binary_encoding
+  BINARY_WRITE_FLAGS = "wb" + binary_encoding
 
   unless method_defined?(:binread)
     def binread(length = nil, offset = nil)
diff --git a/test/test_pathname.rb b/test/test_pathname.rb
index 4cfd7bf..a54231e 100644
--- a/test/test_pathname.rb
+++ b/test/test_pathname.rb
@@ -145,7 +145,7 @@ def test_glob_files
 
   if File::ALT_SEPARATOR == "\\"
     def test_initialize
-      assert_equal "a/b/c", Pathname("a\\b\\c").to_s
+      assert_equal Pathname("a/b/c"), Pathname("a\\b\\c")
     end
   end
 
@@ -154,8 +154,9 @@ def test_copy_to
     contents = "abab"
     source.write(contents)
     assert(!dest.exist?)
-    source.copy_to(dest)
-    assert contents, source.read
-    assert contents, dest.read
+    result = source.copy_to(dest)
+    assert_equal contents, source.read
+    assert_equal contents, dest.read
+    assert_equal dest, result
   end
 end