1 files changed, 49 insertions, 0 deletions
diff --git a/spec/ruby/core/symbol/capitalize_spec.rb b/spec/ruby/core/symbol/capitalize_spec.rb
new file mode 100644
index 0000000000..cf7e8a007f
--- /dev/null
+++ b/spec/ruby/core/symbol/capitalize_spec.rb
@@ -0,0 +1,49 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Symbol#capitalize" do
+  it "returns a Symbol" do
+    :glark.capitalize.should be_an_instance_of(Symbol)
+  end
+
+  it "converts the first character to uppercase if it is ASCII" do
+    :lower.capitalize.should == :Lower
+  end
+
+  it "leaves the first character alone if it is not an alphabetical character" do
+    :"£1.20".capitalize.should == :"£1.20"
+  end
+
+  ruby_version_is ''...'2.4' do
+    it "leaves the first character alone if it is not an alphabetical ASCII character" do
+      "\u{00DE}c".to_sym.capitalize.should == :"Þc"
+      "\u{00DF}C".to_sym.capitalize.should == :"ßc"
+    end
+  end
+
+  it "converts subsequent uppercase ASCII characters to their lowercase equivalents" do
+    :lOWER.capitalize.should == :Lower
+  end
+
+  it "leaves ASCII characters already in the correct case as they were" do
+    :Title.capitalize.should == :Title
+  end
+
+  it "works with both upper- and lowercase ASCII characters in the same Symbol" do
+    :mIxEd.capitalize.should == :Mixed
+  end
+
+  ruby_version_is ''...'2.4' do
+    it "leaves uppercase Unicode characters as they were" do
+      "a\u{00DE}c".to_sym.capitalize.should == :"AÞc"
+    end
+  end
+
+  it "leaves lowercase Unicode characters (except in first position) as they were" do
+    "a\u{00DF}C".to_sym.capitalize.should == :"Aßc"
+  end
+
+  it "leaves non-alphabetic ASCII characters as they were" do
+    "Glark?!?".to_sym.capitalize.should == :"Glark?!?"
+  end
+end