add support for FFI::Platform::LIBSUFFIX

spec/core/ffi/platform_spec.rb

@@ -0,0 +1,22 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "FFI::Platform::LIBSUFFIX" do
+  platform_is :linux do
+    it "returns .so" do
+      FFI::Platform::LIBSUFFIX.should == '.so'
+    end
+  end
+
+  platform_is :windows do
+    it "returns .dll" do
+      FFI::Platform::LIBSUFFIX.should == '.dll'
+    end
+  end
+
+  platform_is :darwin do
+    it "returns .dylib" do
+      FFI::Platform::LIBSUFFIX.should == '.dylib'
+    end
+  end
+end
+