78 lines
2.0 KiB
Java
78 lines
2.0 KiB
Java
package com.baeldung;
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import org.junit.gen5.api.*;
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import java.util.EmptyStackException;
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import java.util.Stack;
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public class NestedTest {
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Stack<Object> stack;
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boolean isRun = false;
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@Test
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@DisplayName("is instantiated with new Stack()")
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void isInstantiatedWithNew() {
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new Stack<Object>();
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}
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@Nested
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@DisplayName("when new")
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class WhenNew {
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@BeforeEach
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void init() {
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stack = new Stack<Object>();
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}
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@Test
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@DisplayName("is empty")
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void isEmpty() {
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Assertions.assertTrue(stack.isEmpty());
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}
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@Test
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@DisplayName("throws EmptyStackException when popped")
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void throwsExceptionWhenPopped() {
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Assertions.expectThrows(EmptyStackException.class, () -> stack.pop());
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}
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@Test
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@DisplayName("throws EmptyStackException when peeked")
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void throwsExceptionWhenPeeked() {
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Assertions.expectThrows(EmptyStackException.class, () -> stack.peek());
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}
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@Nested
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@DisplayName("after pushing an element")
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class AfterPushing {
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String anElement = "an element";
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@BeforeEach
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void init() {
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stack.push(anElement);
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}
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@Test
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@DisplayName("it is no longer empty")
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void isEmpty() {
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Assertions.assertFalse(stack.isEmpty());
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}
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@Test
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@DisplayName("returns the element when popped and is empty")
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void returnElementWhenPopped() {
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Assertions.assertEquals(anElement, stack.pop());
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Assertions.assertTrue(stack.isEmpty());
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}
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@Test
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@DisplayName("returns the element when peeked but remains not empty")
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void returnElementWhenPeeked() {
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Assertions.assertEquals(anElement, stack.peek());
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Assertions.assertFalse(stack.isEmpty());
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}
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}
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}
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}
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