lambdaspec.java

import pl.project13.test.lambda.exampleimpl.Adder;
import pl.project13.test.lambda.spec.set.ClassSpecSet;

import static org.fest.assertions.Assertions.assertThat;
import static pl.project13.test.lambda.SpecDSL.describe;

public class ClassSpecTest {

  // this `SpecSet` provides a new instance of the tested class for each `should`
  ClassSpecSet<Adder> it = describe(Adder.class);

  {
    it.should("add two numbers", adder -> {
      // given
      int a = 1;
      int b = 2;

      int expected = 3;

      // when
      int got = adder.add(a, b);

      // then
      assertThat(got).isEqualTo(expected);
    });

    it.should("add a negative number", adder -> {
      // given
      int a = -1;
      int b = 2;

      int expected = 333; // wrong `expected`, to demo failure logging

      // when
      int got = adder.add(a, b);

      // then
      assertThat(got).isEqualTo(expected);
    });

    it.should("add imaginary numbers", MarkAs.pending);
  }

  // currently LambdaSpec has no stand alone runner, so fire it up using JUnit
  @Test
  public void shouldPassAllTests() throws Exception {
    it.shouldPassAllTests();
  }
}

A simple, yet working, proof of concept, how testing frameworks will look with Java8. Check out the rest https://github.com/ktoso/lambda-spec