Added tests for query isNull expressions

src/test/java/com/avaje/tests/query/TestQueryIsNull.java

@@ -0,0 +1,58 @@
+package com.avaje.tests.query;
+
+import com.avaje.ebean.BaseTestCase;
+import com.avaje.ebean.Ebean;
+import com.avaje.ebean.Query;
+import com.avaje.tests.model.basic.Order;
+import com.avaje.tests.model.basic.ResetBasicData;
+import com.avaje.tests.model.m2m.Role;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestQueryIsNull extends BaseTestCase {
+
+
+    @Test
+    public void queryShouldContainIsNullOnColumn() {
+        ResetBasicData.reset();
+
+        Query<Order> query = Ebean.find(Order.class).where().isNull("customerName").query();
+        query.findList();
+
+        Assert.assertTrue(query.getGeneratedSql().contains("name is null"));
+    }
+
+    @Test
+    public void queryShouldLeftJoinForOneToManyInDisjunction() {
+        ResetBasicData.reset();
+
+        Query<Order> query = Ebean.find(Order.class).where().disjunction().isNull("details").endJunction().query();
+        query.findList();
+
+        Assert.assertTrue(query.getGeneratedSql().contains("left outer join"));
+        Assert.assertTrue(query.getGeneratedSql().contains("is null"));
+    }
+
+    @Test
+    public void queryShouldLeftJoinForOneToManyRelation() {
+        ResetBasicData.reset();
+
+        Query<Order> query = Ebean.find(Order.class).where().isNull("details").query();
+        query.findList();
+
+        Assert.assertTrue(query.getGeneratedSql().contains("left outer join"));
+        Assert.assertTrue(query.getGeneratedSql().contains("is null"));
+
+    }
+
+    @Test
+    public void queryShouldLeftJoinForManyToManyRelation() {
+        ResetBasicData.reset();
+
+        Query<Role> query = Ebean.find(Role.class).where().isNull("permissions").query();
+        query.findList();
+
+        Assert.assertTrue(query.getGeneratedSql().contains("left outer join"));
+        Assert.assertTrue(query.getGeneratedSql().contains("is null"));
+    }
+}