1 files changed, 93 insertions, 0 deletions
diff --git a/spec/ruby/language/execution_spec.rb b/spec/ruby/language/execution_spec.rb
new file mode 100644
index 0000000000..51bcde62e8
--- /dev/null
+++ b/spec/ruby/language/execution_spec.rb
@@ -0,0 +1,93 @@
+require_relative '../spec_helper'
+
+describe "``" do
+  it "returns the output of the executed sub-process" do
+    ip = 'world'
+    `echo disc #{ip}`.should == "disc world\n"
+  end
+
+  it "can be redefined and receive a frozen string as argument" do
+    called = false
+    runner = Object.new
+
+    runner.singleton_class.define_method(:`) do |str|
+      called = true
+
+      str.should == "test command"
+      str.frozen?.should == true
+    end
+
+    runner.instance_exec do
+      `test command`
+    end
+
+    called.should == true
+  end
+
+  it "the argument isn't frozen if it contains interpolation" do
+    called = false
+    runner = Object.new
+
+    runner.singleton_class.define_method(:`) do |str|
+      called = true
+
+      str.should == "test command"
+      str.frozen?.should == false
+      str << "mutated"
+    end
+
+    2.times do
+      runner.instance_exec do
+        `test #{:command}` # rubocop:disable Lint/LiteralInInterpolation
+      end
+    end
+
+    called.should == true
+  end
+end
+
+describe "%x" do
+  it "is the same as ``" do
+    ip = 'world'
+    %x(echo disc #{ip}).should == "disc world\n"
+  end
+
+  it "can be redefined and receive a frozen string as argument" do
+    called = false
+    runner = Object.new
+
+    runner.singleton_class.define_method(:`) do |str|
+      called = true
+
+      str.should == "test command"
+      str.frozen?.should == true
+    end
+
+    runner.instance_exec do
+      %x{test command}
+    end
+
+    called.should == true
+  end
+
+  it "the argument isn't frozen if it contains interpolation" do
+    called = false
+    runner = Object.new
+
+    runner.singleton_class.define_method(:`) do |str|
+      called = true
+
+      str.should == "test command"
+      str.frozen?.should == false
+      str << "mutated"
+    end
+
+    2.times do
+      runner.instance_exec do
+        %x{test #{:command}} # rubocop:disable Lint/LiteralInInterpolation
+      end
+    end
+
+    called.should == true
+  end
+end