Merge pull request #16934 from sk1418/hamcrest-prop-in-collection

[hamcrest-prop-in-collection] Hamcrest list check

Author: theangrydev

testing-modules/hamcrest/src/test/java/com/baeldung/hamcrest/listcontainitems/Developer.java

@@ -0,0 +1,33 @@
+package com.baeldung.hamcrest.listcontainitems;
+
+import java.util.List;
+
+public class Developer {
+    private String name;
+    private int age;
+    private String os;
+    private List<String> languages;
+
+    public Developer(String name, int age, String os, List<String> languages) {
+        this.name = name;
+        this.age = age;
+        this.os = os;
+        this.languages = languages;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public String getOs() {
+        return os;
+    }
+
+    public List<String> getLanguages() {
+        return languages;
+    }
+}

testing-modules/hamcrest/src/test/java/com/baeldung/hamcrest/listcontainitems/HamcrestElementPropInCollectionUnitTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.hamcrest.listcontainitems;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+public class HamcrestElementPropInCollectionUnitTest {
+    private static final List<Developer> DEVELOPERS = List.of(
+        new Developer("Kai", 28, "Linux", List.of("Kotlin", "Python")),
+        new Developer("Liam", 26, "MacOS", List.of("Java", "C#")),
+        new Developer("Kevin", 24, "MacOS", List.of("Python", "Go")),
+        new Developer("Saajan", 22, "MacOS", List.of("Ruby", "Php", "Typescript")),
+        new Developer("Eric", 27, "Linux", List.of("Java", "C"))
+    );
+
+    @Test
+    void whenUsingHamcrestMatchers_thenCorrect() {
+        assertThat(DEVELOPERS, hasItem(hasProperty("os", equalTo("Linux"))));
+        assertThat(DEVELOPERS, hasItem(hasProperty("name", is("Kai"))));
+        assertThat(DEVELOPERS, hasItem(hasProperty("age", lessThan(28))));
+        assertThat(DEVELOPERS, hasItem(hasProperty("languages", hasItem("Go"))));
+
+        assertThat(DEVELOPERS, hasItem(
+            anyOf(
+                hasProperty("languages", hasItem("C")),
+                hasProperty("os", is("Windows"))) // <-- No dev has the OS "Windows"
+        ));
+
+        assertThat(DEVELOPERS, hasItem(
+            allOf(
+                hasProperty("languages", hasItem("C")),
+                hasProperty("os", is("Linux")),
+                hasProperty("age", greaterThan(25)))
+        ));
+
+        assertThat(DEVELOPERS, not(hasItem( // <-- not() matcher
+            allOf(
+                hasProperty("languages", hasItem("C#")),
+                hasProperty("os", is("Linux")),
+                hasProperty("age", greaterThan(25)))
+        )));
+    }
+
+    @Test
+    void whenUsingStreamAnyMatch_thenCorrect() {
+        assertTrue(DEVELOPERS.stream().anyMatch(dev -> dev.getOs().equals("Linux")));
+        assertTrue(DEVELOPERS.stream().anyMatch(dev -> dev.getAge() < 28));
+        assertTrue(DEVELOPERS.stream().anyMatch(dev -> dev.getLanguages().contains("Go")));
+        assertTrue(DEVELOPERS.stream().anyMatch(dev -> dev.getLanguages().contains("C") && dev.getOs().equals("Linux")));
+    }
+
+}