Enumerable#exactly? - more examples, more specs

lib/powerpack/enumerable/exactly.rb

@@ -14,7 +14,9 @@ module Enumerable
     # This means that nil and false elements will be ignored.
     #
     # @example
-    #   [1, false, nil].exactly? #=> false
+    #   [1, false, nil].exactly?(3) #=> false
+    #   [1, false, nil].exactly?(1) #=> true
+    #   [false, nil].exactly?(0) #=> true
     #   [1, 2, 3].exactly?(3) #=>true
     def exactly?(n)
       found_count = 0

spec/powerpack/enumerable/exactly_spec.rb

@@ -16,11 +16,23 @@
   end
 
   context 'without block' do
-    it 'returns true for exact number of non nil/false elements' do
+    it 'returns true for exact number of non nil/false elements in absence of nil/false elements' do
       expect([1, 2, 3, 4].exactly?(4)).to be_true
     end
 
-    it 'returns false if there are less non nil/false elements' do
+    it 'returns true for exact number of non nil/false elements in presence of nil/false elements' do
+      expect([1, 2, nil, false].exactly?(2)).to be_true
+    end
+
+    it 'returns true for exact number of nil/false elements' do
+      expect([nil, false].exactly?(0)).to be_true
+    end
+
+    it 'returns false if there are less non nil/false elements in absence of nil/false elements' do
+      expect([1, 2, 3].exactly?(4)).to be_false
+    end
+
+    it 'returns false if there are less non nil/false elements in presence of nil/false elements' do
       expect([1, nil, false].exactly?(4)).to be_false
     end
   end