1 files changed, 53 insertions, 0 deletions
diff --git a/spec/ruby/core/range/first_spec.rb b/spec/ruby/core/range/first_spec.rb
new file mode 100644
index 0000000000..2af935f439
--- /dev/null
+++ b/spec/ruby/core/range/first_spec.rb
@@ -0,0 +1,53 @@
+require_relative '../../spec_helper'
+require_relative 'shared/begin'
+
+describe "Range#first" do
+  it_behaves_like :range_begin, :first
+
+  it "returns the specified number of elements from the beginning" do
+    (0..2).first(2).should == [0, 1]
+  end
+
+  it "returns an empty array for an empty Range" do
+    (0...0).first(2).should == []
+  end
+
+  it "returns an empty array when passed zero" do
+    (0..2).first(0).should == []
+  end
+
+  it "returns all elements in the range when count exceeds the number of elements" do
+    (0..2).first(4).should == [0, 1, 2]
+  end
+
+  it "raises an ArgumentError when count is negative" do
+    -> { (0..2).first(-1) }.should raise_error(ArgumentError)
+  end
+
+  it "calls #to_int to convert the argument" do
+    obj = mock_int(2)
+    (3..7).first(obj).should == [3, 4]
+  end
+
+  it "raises a TypeError if #to_int does not return an Integer" do
+    obj = mock("to_int")
+    obj.should_receive(:to_int).and_return("1")
+    -> { (2..3).first(obj) }.should raise_error(TypeError)
+  end
+
+  it "truncates the value when passed a Float" do
+    (2..9).first(2.8).should == [2, 3]
+  end
+
+  it "raises a TypeError when passed nil" do
+    -> { (2..3).first(nil) }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed a String" do
+    -> { (2..3).first("1") }.should raise_error(TypeError)
+  end
+
+  it "raises a RangeError when called on an beginless range" do
+    -> { (..1).first }.should raise_error(RangeError)
+  end
+end