new: junit: #assertEmpty

assira.junit/src/main/java/net/ranides/assira/junit/NewAssert.java

@@ -22,6 +22,7 @@ import java.util.Date;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.function.BiPredicate;
 import java.util.function.Predicate;
 
@@ -247,6 +248,18 @@ public final class NewAssert extends org.junit.Assert {
     public static void assertEquals(Date a, Date b, long dt) {
         assertTrue(a + " and " + b + " are not equal", Math.abs(a.getTime() - b.getTime()) <= dt);
     }
+    
+    public static void assertEmpty(Optional<?> value) {
+        assertFalse("Optional should be empty", value.isPresent());
+    }
+    
+    public static void assertEmpty(Collection<?> value) {
+        assertTrue("Collection should be empty", value.isEmpty());
+    }
+    
+    public static void assertEmpty(Map<?,?> value) {
+        assertTrue("Map should be empty", value.isEmpty());
+    }
 
     public interface Action {