1 files changed, 52 insertions, 0 deletions
diff --git a/spec/rubyspec/core/string/swapcase_spec.rb b/spec/rubyspec/core/string/swapcase_spec.rb
new file mode 100644
index 0000000000..0085887ae2
--- /dev/null
+++ b/spec/rubyspec/core/string/swapcase_spec.rb
@@ -0,0 +1,52 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#swapcase" do
+  it "returns a new string with all uppercase chars from self converted to lowercase and vice versa" do
+   "Hello".swapcase.should == "hELLO"
+   "cYbEr_PuNk11".swapcase.should == "CyBeR_pUnK11"
+   "+++---111222???".swapcase.should == "+++---111222???"
+  end
+
+  it "taints resulting string when self is tainted" do
+    "".taint.swapcase.tainted?.should == true
+    "hello".taint.swapcase.tainted?.should == true
+  end
+
+  ruby_version_is ''...'2.4' do
+    it "is locale insensitive (only upcases a-z and only downcases A-Z)" do
+      "ÄÖÜ".swapcase.should == "ÄÖÜ"
+      "ärger".swapcase.should == "äRGER"
+      "BÄR".swapcase.should == "bÄr"
+    end
+  end
+
+  it "returns subclass instances when called on a subclass" do
+    StringSpecs::MyString.new("").swapcase.should be_an_instance_of(StringSpecs::MyString)
+    StringSpecs::MyString.new("hello").swapcase.should be_an_instance_of(StringSpecs::MyString)
+  end
+end
+
+describe "String#swapcase!" do
+  it "modifies self in place" do
+    a = "cYbEr_PuNk11"
+    a.swapcase!.should equal(a)
+    a.should == "CyBeR_pUnK11"
+  end
+
+  it "returns nil if no modifications were made" do
+    a = "+++---111222???"
+    a.swapcase!.should == nil
+    a.should == "+++---111222???"
+
+    "".swapcase!.should == nil
+  end
+
+  it "raises a RuntimeError when self is frozen" do
+    ["", "hello"].each do |a|
+      a.freeze
+      lambda { a.swapcase! }.should raise_error(RuntimeError)
+    end
+  end
+end