Add specs for value types

spec/spectator/lazy_spec.cr

@@ -0,0 +1,15 @@
+require "../spec_helper"
+
+Spectator.describe Spectator::Lazy do
+  subject { Spectator::Lazy(Int32).new }
+
+  it "returns the value of the block" do
+    expect { subject.get { 42 } }.to eq(42)
+  end
+
+  it "caches the value" do
+    count = 0
+    expect { subject.get { count += 1 } }.to change { count }.from(0).to(1)
+    expect { subject.get { count += 1 } }.to_not change { count }
+  end
+end