Proc#lambda? isn’t available on 1.8.7 for JRuby.

Author: myronmarston

lib/rspec/support.rb

@@ -56,9 +56,15 @@ def self.method_handle_for(object, method_name)
     end
 
     if RUBY_PLATFORM == 'java'
-      def self.proc_to_lambda(block)
-        return block if block.lambda?
-        lambda(&block)
+      if Proc.method_defined?(:lambda?)
+        def self.proc_to_lambda(block)
+          return block if block.lambda?
+          lambda(&block)
+        end
+      else
+        def self.proc_to_lambda(block)
+          lambda(&block)
+        end
       end
     elsif respond_to?(:define_singleton_method)
       def self.proc_to_lambda(block)

spec/rspec/support_spec.rb

@@ -76,18 +76,28 @@ def method_missing(name, *args, &block)
       end
     end
 
-    describe ".proc_to_lambda", :if => Proc.method_defined?(:lambda?) do
-      it "converts a proc to a lambda" do
-        p = Proc.new { 47 }
-        expect(p).not_to be_lambda
-        l = Support.proc_to_lambda(p)
-        expect(l).to be_lambda
-        expect(l.call).to eq(47)
+    describe ".proc_to_lambda" do
+      context "on an interpreter that provides Proc#lambda?", :if => Proc.method_defined?(:lambda?) do
+        it "converts a proc to a lambda" do
+          p = Proc.new { 47 }
+          expect(p).not_to be_lambda
+          l = Support.proc_to_lambda(p)
+          expect(l).to be_lambda
+          expect(l.call).to eq(47)
+        end
+
+        it 'returns a lambda unchanged' do
+          l = lambda { }
+          expect(Support.proc_to_lambda(l)).to be(l)
+        end
       end
 
-      it 'returns a lambda unchanged' do
-        l = lambda { }
-        expect(Support.proc_to_lambda(l)).to be(l)
+      context "on an interpreter that does not provide Proc#lambda?", :unless => Proc.method_defined?(:lambda?) do
+        it 'converts a proc to a lambda' do
+          p = Proc.new { return 47 }
+          l = Support.proc_to_lambda(p)
+          expect(l.call).to eq(47)
+        end
       end
     end
   end