DATALDAP-65 - Fix query execution without predicates using Querydsl.

Query execution without a predicate now no longer fails but falls back to LdapOperations.findAll(…). Previously, we did not initialize the filter of LdapQuery which caused an IllegalStateException in LdapOperations.find(…).

src/test/java/org/springframework/data/ldap/repository/support/QueryDslLdapQueryUnitTests.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.ldap.repository.support;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.ldap.core.LdapOperations;
+import org.springframework.ldap.filter.AbsoluteTrueFilter;
+import org.springframework.ldap.filter.EqualsFilter;
+import org.springframework.ldap.odm.core.impl.DefaultObjectDirectoryMapper;
+import org.springframework.ldap.query.LdapQuery;
+
+/**
+ * Unit tests for {@link QueryDslLdapQuery}.
+ *
+ * @author Mark Paluch
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class QueryDslLdapQueryUnitTests {
+
+	@Mock LdapOperations ldapOperations;
+
+	@Before
+	public void before() {
+		when(ldapOperations.getObjectDirectoryMapper()).thenReturn(new DefaultObjectDirectoryMapper());
+	}
+
+	@Test // DATALDAP-65
+	public void shouldCreateFilter() {
+
+		QueryDslLdapQuery<UnitTestPerson> query = new QueryDslLdapQuery<UnitTestPerson>(ldapOperations,
+				UnitTestPerson.class);
+
+		LdapQuery ldapQuery = query.where(QPerson.person.fullName.eq("foo")).buildQuery();
+
+		assertThat(ldapQuery.filter()).isInstanceOf(EqualsFilter.class);
+	}
+
+	@Test // DATALDAP-65
+	public void shouldCreateEmptyFilter() {
+
+		QueryDslLdapQuery<UnitTestPerson> query = new QueryDslLdapQuery<UnitTestPerson>(ldapOperations,
+				UnitTestPerson.class);
+
+		LdapQuery ldapQuery = query.buildQuery();
+
+		assertThat(ldapQuery.filter()).isInstanceOf(AbsoluteTrueFilter.class);
+	}
+
+	@Test // DATALDAP-65
+	public void shouldCreateEmptyFilterFromWhereNull() {
+
+		QueryDslLdapQuery<UnitTestPerson> query = new QueryDslLdapQuery<UnitTestPerson>(ldapOperations, QPerson.person);
+
+		LdapQuery ldapQuery = query.where(null).buildQuery();
+
+		assertThat(ldapQuery.filter()).isInstanceOf(AbsoluteTrueFilter.class);
+	}
+}