1 files changed, 43 insertions, 0 deletions
diff --git a/spec/ruby/core/encoding/aliases_spec.rb b/spec/ruby/core/encoding/aliases_spec.rb
new file mode 100644
index 0000000000..12c6c6cf85
--- /dev/null
+++ b/spec/ruby/core/encoding/aliases_spec.rb
@@ -0,0 +1,43 @@
+require_relative '../../spec_helper'
+
+describe "Encoding.aliases" do
+  it "returns a Hash" do
+    Encoding.aliases.should.instance_of?(Hash)
+  end
+
+  it "has Strings as keys" do
+    Encoding.aliases.keys.each do |key|
+      key.should.instance_of?(String)
+    end
+  end
+
+  it "has Strings as values" do
+    Encoding.aliases.values.each do |value|
+      value.should.instance_of?(String)
+    end
+  end
+
+  it "has alias names as its keys" do
+    Encoding.aliases.key?('BINARY').should == true
+    Encoding.aliases.key?('ASCII').should == true
+  end
+
+  it "has the names of the aliased encoding as its values" do
+    Encoding.aliases['BINARY'].should == 'ASCII-8BIT'
+    Encoding.aliases['ASCII'].should == 'US-ASCII'
+  end
+
+  it "has an 'external' key with the external default encoding as its value" do
+    Encoding.aliases['external'].should == Encoding.default_external.name
+  end
+
+  it "has a 'locale' key and its value equals the name of the encoding found by the locale charmap" do
+    Encoding.aliases['locale'].should == Encoding.find(Encoding.locale_charmap).name
+  end
+
+  it "only contains valid aliased encodings" do
+    Encoding.aliases.each do |aliased, original|
+      Encoding.find(aliased).should == Encoding.find(original)
+    end
+  end
+end