spec/option_spec.rb in option-0.1.0 vs spec/option_spec.rb in option-0.1.1

@@ -54,10 +54,18 @@
 
   it "#fold should invoke the default proc" do
     None.fold(proc { value }) { |v| v.to_f }.must_equal(value)
   end
 
+  it "#filter with a true predicate returns itself" do
+    Option(value).filter { |i| i == 12 }.must_equal(Option(value))
+  end
+
+  it "#filter with a false predicate returns None" do
+    Option(value).filter { |i| i == 1 }.must_equal(None)
+  end
+
   it "should be aliased to None" do
     None.must_be_instance_of(NoneClass)
   end
 end
 
@@ -125,9 +133,13 @@
     Some(value).exists? { |v| v % 2 != 0 }.must_equal(false)
   end
 
   it "#fold should map the proc over the value and return it" do
     Some(value).fold(proc { value * 2 }) { |v| v * 3 }.must_equal(36)
+  end
+
+  it "#filter should return itself" do
+    None.filter { |i| i == 0 }.must_equal(None)
   end
 
   it "should wrap the creation of a Some" do
     Some(value).must_be_instance_of(SomeClass)
   end