BAEL-917 Testing with Google Truth (#1874)

* BAEL-917 Testing with Google Truth

* BAEL-917 Testing with Google Truth

testing/pom.xml

@@ -52,6 +52,18 @@
             <version>${pitest.version}</version>
             <type>pom</type>
         </dependency>
+        
+        <dependency>
+            <groupId>com.google.truth</groupId>
+            <artifactId>truth</artifactId>
+            <version>${truth.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.truth.extensions</groupId>
+            <artifactId>truth-java8-extension</artifactId>
+            <version>${truth.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
     <build>
         <plugins>
@@ -114,8 +126,9 @@
         <cucumber.version>1.2.5</cucumber.version>
         <pitest.version>1.1.10</pitest.version>
         <jacoco.version>0.7.7.201606060606</jacoco.version>
-        <guava.version>19.0</guava.version>
+        <guava.version>21.0</guava.version>
         <assertj-guava.version>3.1.0</assertj-guava.version>
         <assertj-core.version>3.6.1</assertj-core.version>
+        <truth.version>0.32</truth.version>
     </properties>
 </project>

testing/src/main/java/com/baeldung/testing/truth/User.java

@@ -0,0 +1,57 @@
+package com.baeldung.testing.truth;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+
+public class User implements Comparable<User> {
+    private String name = "John Doe";
+    private List<String> emails = Arrays.asList("[email protected]", "[email protected]");
+
+    public User() {
+    }
+
+    public User(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<String> getEmails() {
+        return emails;
+    }
+
+    public void setEmails(List<String> emails) {
+        this.emails = emails;
+    }
+
+    @Override
+    public int hashCode() {
+        int hash = 5;
+        hash = 37 * hash + Objects.hashCode(this.name);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+
+        final User other = (User) obj;
+        return Objects.equals(this.name, other.name);
+    }
+
+    @Override
+    public int compareTo(User o) {
+        return this.getName()
+            .compareToIgnoreCase(o.getName());
+    }
+
+}

testing/src/main/java/com/baeldung/testing/truth/UserSubject.java

@@ -0,0 +1,46 @@
+package com.baeldung.testing.truth;
+
+import com.google.common.truth.ComparableSubject;
+import com.google.common.truth.FailureStrategy;
+import com.google.common.truth.IterableSubject;
+import com.google.common.truth.SubjectFactory;
+import com.google.common.truth.Truth;
+
+public class UserSubject extends ComparableSubject<UserSubject, User> {
+
+    private UserSubject(FailureStrategy failureStrategy, User target) {
+        super(failureStrategy, target);
+    }
+
+    private static final SubjectFactory<UserSubject, User> USER_SUBJECT_FACTORY = new SubjectFactory<UserSubject, User>() {
+        @Override
+        public UserSubject getSubject(FailureStrategy failureStrategy, User target) {
+            return new UserSubject(failureStrategy, target);
+        }
+    };
+
+    public static UserSubject assertThat(User user) {
+        return Truth.assertAbout(USER_SUBJECT_FACTORY)
+            .that(user);
+    }
+
+    // Our API begins here
+    public void hasName(String name) {
+        if (!actual().getName()
+            .equals(name)) {
+            fail("has name", name);
+        }
+    }
+
+    public void hasNameIgnoringCase(String name) {
+        if (!actual().getName()
+            .equalsIgnoreCase(name)) {
+            fail("has name ignoring case", name);
+        }
+    }
+
+    public IterableSubject emails() {
+        return Truth.assertThat(actual().getEmails());
+    }
+
+}