1 files changed, 50 insertions, 1 deletions
diff --git a/spec/lib/range_ext_spec.rb b/spec/lib/range_ext_spec.rb
index 9c44608b9..eee488c91 100644
--- a/spec/lib/range_ext_spec.rb
+++ b/spec/lib/range_ext_spec.rb
@@ -1,6 +1,6 @@
 require 'range_ext'
 RSpec.describe Range do
-  context "intersection" do
+  describe "#intersection" do
     it "is nil (sic) for two distinct ranges" do
       expect( (1..2).intersection(3..4) ).to be_nil
     end
@@ -15,4 +15,53 @@ RSpec.describe Range do
       expect( (2..4) & (1..3) ).to eq 2..3
     end
   end
+
+  describe "intersect?" do
+    it 'is true when the given range includes begin' do
+      expect( (2..4).intersect? (1..3) ).to be_truthy
+    end
+
+    it 'is true when the given range includes end' do
+      expect( (2..4).intersect? (3..5) ).to be_truthy
+    end
+
+    it 'is true when the given range includes both begin and end' do
+      expect( (2..4).intersect? (1..5) ).to be_truthy
+    end
+
+    it 'is true when the given range is the same' do
+      expect( (2..4).intersect? (2..4) ).to be_truthy
+    end
+
+    it 'is false when the given range is after' do
+      expect( (2..4).intersect? (5..7) ).to be_falsey
+    end
+
+    it 'is false when the given range is before' do
+      expect( (2..4).intersect? (0..2) ).to be_falsey
+    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