1 files changed, 23 insertions, 0 deletions
diff --git a/spec/lib/range_ext_spec.rb b/spec/lib/range_ext_spec.rb
index 9c44608b9..cae637e47 100644
--- a/spec/lib/range_ext_spec.rb
+++ b/spec/lib/range_ext_spec.rb
@@ -15,4 +15,27 @@ RSpec.describe Range do
       expect( (2..4) & (1..3) ).to eq 2..3
     end
   end
+
+  context "remove" do
+    it "is unchanged when the given range has no intersection" do
+      expect( (1..2).remove(3..4) ).to eq 1..2
+      expect( (3..4).remove(1..2) ).to eq 3..4
+    end
+
+    it "is nil for two equal ranges" do
+      expect( (1..2).remove(1..2) ).to be_empty
+    end
+
+    it "is the begin of the range when given range intersect the end" do
+      expect( (5..10).remove(8..15) ).to eq [5..7]
+    end
+
+    it "is the end of the range when given range intersect the begin" do
+      expect( (5..10).remove(1..6) ).to eq [7..10]
+    end
+
+    it "is the two remaing ranges when given range is the middle" do
+      expect( (1..10).remove(4..6) ).to eq [1..3, 7..10]
+    end
+  end
 end