Merge pull request #26 from kemitix/jdk-9-compatible

Compile with Java 9 Compatibility

Jenkinsfile.groovy

@@ -30,6 +30,13 @@ pipeline {
                         }
                     }
                 }
+                stage('Java 9') {
+                    steps {
+                        withMaven(maven: 'maven 3.5.2', jdk: 'JDK 9') {
+                            sh 'mvn clean install'
+                        }
+                    }
+                }
             }
         }
         stage('Test Results') {

pom.xml

@@ -10,6 +10,7 @@
         <version>5.1.0</version>
         <relativePath/>
     </parent>
+    <groupId>net.kemitix</groupId>
     <artifactId>mon</artifactId>
     <version>0.6.0-SNAPSHOT</version>
 

src/main/java/net/kemitix/mon/Mon.java

@@ -118,17 +118,8 @@ public class Mon<T> implements Functor<T, Mon<?>> {
      * @return true if they are the same
      */
     @Override
-    @SuppressWarnings("npathcomplexity")
     public boolean equals(final Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (o == null || getClass() != o.getClass()) {
-            return false;
-        }
-
-        final Mon<?> mon = (Mon<?>) o;
-
-        return value.equals(mon.value);
+        return this == o || o != null && getClass() == o.getClass() && value.equals(((Mon<?>) o).value);
     }
+
 }

src/test/java/net/kemitix/mon/MonTest.java

@@ -93,6 +93,7 @@ public class MonTest {
     }
 
     @Test
+    @SuppressWarnings("ResultOfMethodCallIgnored")
     public void factoryRequiresValidator() {
         assertThatNullPointerException().isThrownBy(
                 () -> Mon.factory(null, Optional::of, Optional::empty))
@@ -100,6 +101,7 @@ public class MonTest {
     }
 
     @Test
+    @SuppressWarnings("ResultOfMethodCallIgnored")
     public void factoryRequiresOnValid() {
         assertThatNullPointerException().isThrownBy(
                 () -> Mon.factory(v -> true, null, Optional::empty))
@@ -107,12 +109,27 @@ public class MonTest {
     }
 
     @Test
+    @SuppressWarnings("ResultOfMethodCallIgnored")
     public void factoryRequiresOnInvalid() {
         assertThatNullPointerException().isThrownBy(
                 () -> Mon.factory(v -> true, Optional::of, null))
                 .withMessage("onInvalid");
     }
 
+    @Test
+    public void factory() {
+        //given
+        final Function<Integer, Optional<?>> evenMonFactory =
+                Mon.factory((Integer v) -> v % 2 == 0, Optional::of, Optional::empty);
+        //when
+        final Optional<?> oddResult = evenMonFactory.apply(1);
+        final Optional<?> evenResult = evenMonFactory.apply(2);
+        //then
+        assertThat(oddResult).isEmpty();// because 1 % 2 != 0
+        assertThat(evenResult).isNotEmpty(); // because 2 % 2 == 0
+        evenResult.ifPresent(value -> assertThat(value).isEqualTo(Mon.of(2)));
+    }
+
     @Test
     public void shouldGetInvalidResultWhenFactoryApplyWithNull() {
         //given

src/test/java/net/kemitix/mon/TypeAliasTest.java

@@ -92,7 +92,7 @@ public class TypeAliasTest {
         final String value = "value";
         final AnAlias anAlias = AnAlias.of(value);
         //then
-        assertThat(anAlias.hashCode()).isEqualTo(value.hashCode());
+        assertThat(anAlias).hasSameHashCodeAs(value);
     }
 
     @Test