1 files changed, 16 insertions, 7 deletions
diff --git a/spec/ruby/core/encoding/ascii_compatible_spec.rb b/spec/ruby/core/encoding/ascii_compatible_spec.rb
index 31ac75302e..04fc159bb8 100644
--- a/spec/ruby/core/encoding/ascii_compatible_spec.rb
+++ b/spec/ruby/core/encoding/ascii_compatible_spec.rb
@@ -1,13 +1,22 @@
 require_relative '../../spec_helper'
 
-with_feature :encoding do
-  describe "Encoding#ascii_compatible?" do
-    it "returns true if self represents an ASCII-compatible encoding" do
-      Encoding::UTF_8.ascii_compatible?.should be_true
-    end
+describe "Encoding#ascii_compatible?" do
+  it "returns true if self represents an ASCII-compatible encoding" do
+    Encoding::UTF_8.ascii_compatible?.should == true
+  end
+
+  it "returns false if self does not represent an ASCII-compatible encoding" do
+    Encoding::UTF_16LE.ascii_compatible?.should == false
+  end
+
+  it "returns false for UTF_16 and UTF_32" do
+    Encoding::UTF_16.should_not.ascii_compatible?
+    Encoding::UTF_32.should_not.ascii_compatible?
+  end
 
-    it "returns false if self does not represent an ASCII-compatible encoding" do
-      Encoding::UTF_16LE.ascii_compatible?.should be_false
+  it "is always false for dummy encodings" do
+    Encoding.list.select(&:dummy?).each do |encoding|
+      encoding.should_not.ascii_compatible?
     end
   end
 end