1 files changed, 50 insertions, 0 deletions
diff --git a/spec/ruby/core/comparable/clamp_spec.rb b/spec/ruby/core/comparable/clamp_spec.rb
new file mode 100644
index 0000000000..75868258b5
--- /dev/null
+++ b/spec/ruby/core/comparable/clamp_spec.rb
@@ -0,0 +1,50 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+ruby_version_is '2.4' do
+  describe 'Comparable#clamp' do
+    it 'raises an Argument error unless given 2 parameters' do
+      c = ComparableSpecs::Weird.new(0)
+      lambda { c.clamp(c) }.should raise_error(ArgumentError)
+      lambda { c.clamp(c, c, c) }.should raise_error(ArgumentError)
+    end
+
+    it 'raises an Argument error unless the 2 parameters are correctly ordered' do
+      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
+      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
+      c = ComparableSpecs::Weird.new(3)
+
+      lambda { c.clamp(two, one) }.should raise_error(ArgumentError)
+      one.should_receive(:<=>).any_number_of_times.and_return(nil)
+      lambda { c.clamp(one, two) }.should raise_error(ArgumentError)
+    end
+
+    it 'returns self if within the given parameters' do
+      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
+      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
+      three = ComparableSpecs::WithOnlyCompareDefined.new(3)
+      c = ComparableSpecs::Weird.new(2)
+
+      c.clamp(one, two).should equal(c)
+      c.clamp(two, two).should equal(c)
+      c.clamp(one, three).should equal(c)
+      c.clamp(two, three).should equal(c)
+    end
+
+    it 'returns the min parameter if smaller than it' do
+      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
+      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
+      c = ComparableSpecs::Weird.new(0)
+
+      c.clamp(one, two).should equal(one)
+    end
+
+    it 'returns the max parameter if greater than it' do
+      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
+      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
+      c = ComparableSpecs::Weird.new(3)
+
+      c.clamp(one, two).should equal(two)
+    end
+  end
+end