Add spec for TypedValueWrapper

spec/internals/typed_value_wrapper_spec.cr

@@ -0,0 +1,18 @@
+require "../spec_helper"
+
+describe Spectator::Internals::TypedValueWrapper do
+  describe "#value" do
+    it "returns the expected value" do
+      value = 12345
+      wrapper = Spectator::Internals::TypedValueWrapper.new(value)
+      wrapper.value.should eq(value)
+    end
+  end
+
+  it "can be cast for storage" do
+    value = 12345
+    wrapper = Spectator::Internals::TypedValueWrapper.new(value).as(Spectator::Internals::ValueWrapper)
+    typed = wrapper.as(Spectator::Internals::TypedValueWrapper(typeof(value)))
+    typed.value.should eq(value)
+  end
+end