1 files changed, 56 insertions, 0 deletions
diff --git a/spec/ruby/core/array/drop_spec.rb b/spec/ruby/core/array/drop_spec.rb
new file mode 100644
index 0000000000..5926c291b8
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+++ b/spec/ruby/core/array/drop_spec.rb
@@ -0,0 +1,56 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Array#drop" do
+  it "removes the specified number of elements from the start of the array" do
+    [1, 2, 3, 4, 5].drop(2).should == [3, 4, 5]
+  end
+
+  it "raises an ArgumentError if the number of elements specified is negative" do
+    -> { [1, 2].drop(-3) }.should raise_error(ArgumentError)
+  end
+
+  it "returns an empty Array if all elements are dropped" do
+    [1, 2].drop(2).should == []
+  end
+
+  it "returns an empty Array when called on an empty Array" do
+    [].drop(0).should == []
+  end
+
+  it "does not remove any elements when passed zero" do
+    [1, 2].drop(0).should == [1, 2]
+  end
+
+  it "returns an empty Array if more elements than exist are dropped" do
+    [1, 2].drop(3).should == []
+  end
+
+  it 'acts correctly after a shift' do
+    ary = [nil, 1, 2]
+    ary.shift
+    ary.drop(1).should == [2]
+  end
+
+  it "tries to convert the passed argument to an Integer using #to_int" do
+    obj = mock("to_int")
+    obj.should_receive(:to_int).and_return(2)
+
+    [1, 2, 3].drop(obj).should == [3]
+  end
+
+  it "raises a TypeError when the passed argument can't be coerced to Integer" do
+    -> { [1, 2].drop("cat") }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the passed argument isn't an integer and #to_int returns non-Integer" do
+    obj = mock("to_int")
+    obj.should_receive(:to_int).and_return("cat")
+
+    -> { [1, 2].drop(obj) }.should raise_error(TypeError)
+  end
+
+  it 'returns a Array instance for Array subclasses' do
+    ArraySpecs::MyArray[1, 2, 3, 4, 5].drop(1).should be_an_instance_of(Array)
+  end
+end