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)}