1 files changed, 25 insertions, 0 deletions
diff --git a/spec/ruby/core/encoding/dummy_spec.rb b/spec/ruby/core/encoding/dummy_spec.rb
new file mode 100644
index 0000000000..05530a8186
--- /dev/null
+++ b/spec/ruby/core/encoding/dummy_spec.rb
@@ -0,0 +1,25 @@
+require_relative '../../spec_helper'
+
+describe "Encoding#dummy?" do
+  it "returns false for proper encodings" do
+    Encoding::UTF_8.dummy?.should == false
+    Encoding::ASCII.dummy?.should == false
+  end
+
+  it "returns true for dummy encodings" do
+    Encoding::ISO_2022_JP.dummy?.should == true
+    Encoding::CP50221.dummy?.should == true
+    Encoding::UTF_7.dummy?.should == true
+  end
+
+  it "returns true for UTF_16 and UTF_32" do
+    Encoding::UTF_16.should.dummy?
+    Encoding::UTF_32.should.dummy?
+  end
+
+  it "implies not #ascii_compatible?" do
+    Encoding.list.select(&:dummy?).each do |encoding|
+      encoding.should_not.ascii_compatible?
+    end
+  end
+end