spec/ruby/core/unboundmethod/bind_call_spec.rb: Added

For UnboundMethod#bind_call [Feature #15955] introduced in
002e592e0d67bb0271d16314a32380ad947c9ae9.

spec/ruby/core/unboundmethod/bind_call_spec.rb

@@ -0,0 +1,50 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "UnboundMethod#bind_call" do
+  before :each do
+    @normal_um = UnboundMethodSpecs::Methods.new.method(:foo).unbind
+    @parent_um = UnboundMethodSpecs::Parent.new.method(:foo).unbind
+    @child1_um = UnboundMethodSpecs::Child1.new.method(:foo).unbind
+    @child2_um = UnboundMethodSpecs::Child2.new.method(:foo).unbind
+  end
+
+  it "raises TypeError if object is not kind_of? the Module the method defined in" do
+    -> { @normal_um.bind_call(UnboundMethodSpecs::B.new) }.should raise_error(TypeError)
+  end
+
+  it "binds and calls the method if object is kind_of the Module the method defined in" do
+    @normal_um.bind_call(UnboundMethodSpecs::Methods.new).should == true
+  end
+
+  it "binds and calls the method on any object when UnboundMethod is unbound from a module" do
+    UnboundMethodSpecs::Mod.instance_method(:from_mod).bind_call(Object.new).should == nil
+  end
+
+  it "binds and calls the method for any object kind_of? the Module the method is defined in" do
+    @parent_um.bind_call(UnboundMethodSpecs::Child1.new).should == nil
+    @child1_um.bind_call(UnboundMethodSpecs::Parent.new).should == nil
+    @child2_um.bind_call(UnboundMethodSpecs::Child1.new).should == nil
+  end
+
+  it "binds and calls a Kernel method retrieved from Object on BasicObject" do
+    Object.instance_method(:instance_of?).bind_call(BasicObject.new, BasicObject).should == true
+  end
+
+  it "binds and calls a Parent's class method to any Child's class methods" do
+    um = UnboundMethodSpecs::Parent.method(:class_method).unbind
+    um.bind_call(UnboundMethodSpecs::Child1).should == "I am UnboundMethodSpecs::Child1"
+  end
+
+  it "will raise when binding a an object singleton's method to another object" do
+    other = UnboundMethodSpecs::Parent.new
+    p = UnboundMethodSpecs::Parent.new
+    class << p
+      def singleton_method
+        :single
+      end
+    end
+    um = p.method(:singleton_method).unbind
+    ->{ um.bind_call(other) }.should raise_error(TypeError)
+  end
+end