Refs #3178; Simplecov bogus config (almost) fixed

1 files changed, 17 insertions, 0 deletions

diff --git a/spec/lib/range_ext_spec.rb b/spec/lib/range_ext_spec.rb
new file mode 100644
index 000000000..0e2365b5e
--- /dev/null
+++ b/spec/lib/range_ext_spec.rb
@@ -0,0 +1,17 @@
+RSpec.describe Range do
+  context "intersection" do
+    it "is nil (sic) for two distinct ranges" do
+      expect( (1..2).intersection(3..4) ).to be_nil
+    end
+
+    it "is the smaller of two if one is part of the other" do
+      expect( (1..2).intersection(0..3) ).to eq 1..2
+      expect( (0..2).intersection(1..2) ).to eq 1..2
+    end
+
+    it "is the intersection otherwise" do
+      expect( (1..3) & (2..4) ).to eq 2..3
+      expect( (2..4) & (1..3) ).to eq 2..3
+    end
+  end
+end