Array#new_range fills unassigned slots with nil. Fixes #3634.

This method needs to be replaced with a Mirror method so it is not polluting the Array namespace.
rubinius · Apr 5, 2016 · 40b599c · 40b599c
1 parent 42fb295
commit 40b599c
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/spec/ruby/core/array/new_range_spec.rb b/spec/ruby/core/array/new_range_spec.rb
@@ -0,0 +1,21 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Array#new_range" do
+  it "returns an Array of length specified by the second parameter" do
+    [].new_range(0, 4).length.should == 4
+  end
+
+  it "returns an Array with a subsequence contained in the original Array" do
+    [1, 2, 3, 4].new_range(1, 3).should == [2, 3, 4]
+  end
+
+  it "returns an Arary with a partial subsequence when the range exceeds the Array size" do
+    ary = [1, 2, 3].new_range(1, 4)
+    ary[0].should == 2
+    ary[1].should == 3
+  end
+
+  it "initializes elements outside the original Array to nil" do
+    [1, 2, 3].new_range(1, 4).should == [2, 3, nil, nil]
+  end
+end