1 files changed, 53 insertions, 0 deletions
diff --git a/spec/rubyspec/core/string/upcase_spec.rb b/spec/rubyspec/core/string/upcase_spec.rb
new file mode 100644
index 0000000000..e23a9829d9
--- /dev/null
+++ b/spec/rubyspec/core/string/upcase_spec.rb
@@ -0,0 +1,53 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#upcase" do
+  it "returns a copy of self with all lowercase letters upcased" do
+    "Hello".upcase.should == "HELLO"
+    "hello".upcase.should == "HELLO"
+  end
+
+  ruby_version_is ''...'2.4' do
+    it "is locale insensitive (only replaces a-z)" do
+      "äöü".upcase.should == "äöü"
+
+      str = Array.new(256) { |c| c.chr }.join
+      expected = Array.new(256) do |i|
+        c = i.chr
+        c.between?("a", "z") ? c.upcase : c
+      end.join
+
+      str.upcase.should == expected
+    end
+  end
+
+  it "taints result when self is tainted" do
+    "".taint.upcase.tainted?.should == true
+    "X".taint.upcase.tainted?.should == true
+    "x".taint.upcase.tainted?.should == true
+  end
+
+  it "returns a subclass instance for subclasses" do
+    StringSpecs::MyString.new("fooBAR").upcase.should be_an_instance_of(StringSpecs::MyString)
+  end
+end
+
+describe "String#upcase!" do
+  it "modifies self in place" do
+    a = "HeLlO"
+    a.upcase!.should equal(a)
+    a.should == "HELLO"
+  end
+
+  it "returns nil if no modifications were made" do
+    a = "HELLO"
+    a.upcase!.should == nil
+    a.should == "HELLO"
+  end
+
+  it "raises a RuntimeError when self is frozen" do
+    lambda { "HeLlo".freeze.upcase! }.should raise_error(RuntimeError)
+    lambda { "HELLO".freeze.upcase! }.should raise_error(RuntimeError)
+  end
+end