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+package com.damienfremont.blog;%0A%0Aimport static org.assertj.core.api.StrictAssertions.assertThat;%0A%0Aimport org.junit.Test;%0A%0A// It's the shortest source code ever. But it lacks stability, behaviour and documentation.%0Apublic class A_SimpleJunitTest %7B%0A%0A%09@Test%0A%09public void test() %7B%0A%09%09ClassToTest classToTest = new ClassToTest();%0A%09%09String receipt = classToTest.buy(%22microwave%22, 100);%0A%09%09assertThat(receipt).isNotNull();%0A%09%09assertThat(classToTest.returns(%22microwave%22, receipt)).contains(%22100%22);%0A%09%7D%0A%7D%0A

Create A_SimpleJunitTest.java