Merge branch 'vlad-pisanov-vp_fix_falsy_memoization'

Version 0.2.0

lib/lazy_object.rb

@@ -10,7 +10,7 @@
 # lazy.get_expensive_results(foo, bar) # Initializes VeryExpensiveObject and calls 'get_expensive_results' on it, passing in foo and bar
 class LazyObject < BasicObject
   def self.version
-    '0.1.0'
+    '0.2.0'
   end
 
   def initialize(&callable)
@@ -31,7 +31,11 @@ def !
 
   # Cached target object.
   def __target_object__
-    @__target_object__ ||= @__callable__.call
+    if defined?(@__target_object__)
+      @__target_object__
+    else
+      @__target_object__ = @__callable__.call
+    end
   end
 
   # Forwards all method calls to the target object.

spec/lazy_object_spec.rb

@@ -71,6 +71,24 @@ def method_with_kwargs_and_yield(**kwargs)
     end
   end
 
+  context "when target object evaluates to a falsy value" do
+    let(:lazy_object) { LazyObject.new { TargetObject.new } }
+
+    it "evaluates the block exactly once for false" do
+      TargetObject.should_receive(:new).once.and_return(false)
+      3.times do
+        expect(lazy_object).to eq(false)
+      end
+    end
+
+    it "evaluates the block exactly once for nil" do
+      TargetObject.should_receive(:new).once.and_return(nil)
+      3.times do
+        expect(lazy_object).to eq(nil)
+      end
+    end
+  end
+
   context "equality operators" do
     it "should return correct value when comparing" do
       one = LazyObject.new { 1 }