A simple test follows:

${message}

Now perform lambda test:

${l1("testing")} ${l1(23)} ${l2("testing")} ${l2(23)} ${l2(#empty)} ${l3("testing")} ${l3("This is a test!")} ${l3("testing").matches} ${l3("This is a test!").matches} ${l4("This is a test")} ${l4(15)} ${l4(#empty)}