HHH-11101 - Add test for issue

(cherry picked from commit a3eac62)

hibernate-core/src/test/java/org/hibernate/test/schemaupdate/uniqueconstraint/TestEntity.hbm.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
+        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd" >
+<hibernate-mapping package="org.hibernate.test.schemaupdate.manytomany" default-access="field">
+    <class entity-name="TestEntity" >
+        <id name="id" type="long">
+            <generator class="native"/>
+        </id>
+
+        <list name="children" table="test_entity_children" >
+            <key column="entity_id" foreign-key="fk_entity"/>
+            <index column="order"/>
+            <many-to-many column="child" entity-name="TestEntity" unique="true" foreign-key="fk_entity_children"/>
+        </list>
+
+        <set name="items" table="test_entity_item">
+            <key column="entity_id"/>
+            <element type="string" column="item" unique="true"/>
+        </set>
+    </class>
+</hibernate-mapping>

hibernate-core/src/test/java/org/hibernate/test/schemaupdate/uniqueconstraint/TestEntity.java

@@ -0,0 +1,21 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.schemaupdate.uniqueconstraint;
+
+import java.util.List;
+import java.util.Set;
+
+/**
+ * @author Andrea Boriero
+ */
+public class TestEntity {
+	private Long id;
+
+	private List<TestEntity> children;
+
+	private Set<String> items;
+}

hibernate-core/src/test/java/org/hibernate/test/schemaupdate/uniqueconstraint/UniqueConstraintGenerationTest.java

@@ -0,0 +1,93 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.schemaupdate.uniqueconstraint;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.EnumSet;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.boot.spi.MetadataImplementor;
+import org.hibernate.cfg.Environment;
+import org.hibernate.tool.hbm2ddl.SchemaExport;
+import org.hibernate.tool.schema.TargetType;
+
+import org.hibernate.testing.TestForIssue;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * @author Andrea Boriero
+ */
+public class UniqueConstraintGenerationTest {
+	private File output;
+	private MetadataImplementor metadata;
+	StandardServiceRegistry ssr;
+
+	@Before
+	public void setUp() throws Exception {
+		output = File.createTempFile( "update_script", ".sql" );
+		output.deleteOnExit();
+		ssr = new StandardServiceRegistryBuilder()
+				.applySetting( Environment.HBM2DDL_AUTO, "none" )
+				.build();
+		metadata = (MetadataImplementor) new MetadataSources( ssr )
+				.addResource( "org/hibernate/test/schemaupdate/uniqueconstraint/TestEntity.hbm.xml" )
+				.buildMetadata();
+		metadata.validate();
+	}
+
+	@After
+	public void tearDown() {
+		StandardServiceRegistryBuilder.destroy( ssr );
+	}
+
+	@Test
+	@TestForIssue(jiraKey = "HHH-11101")
+	public void testUniqueConstraintIsGenerated() throws Exception {
+		new SchemaExport()
+				.setOutputFile( output.getAbsolutePath() )
+				.create( EnumSet.of( TargetType.SCRIPT ), metadata );
+
+		assertThat(
+				"The test_entity_item table unique constraint has not been generated",
+				isUniqueConstraintGenerated( "test_entity_item", "item" ),
+				is( true )
+		);
+
+		assertThat(
+				"The test_entity_children table unique constraint has not been generated",
+				isUniqueConstraintGenerated( "test_entity_children", "child" ),
+				is( true )
+		);
+	}
+
+	private boolean isUniqueConstraintGenerated(String tableName, String columnName) throws IOException {
+		boolean matches = false;
+		final String regex = "alter table " + tableName + " add constraint uk_(.)* unique \\(" + columnName + "\\)";
+
+		final String fileContent = new String( Files.readAllBytes( output.toPath() ) ).toLowerCase();
+		final String[] split = fileContent.split( System.lineSeparator() );
+		Pattern p = Pattern.compile( regex );
+		for ( String line : split ) {
+			final Matcher matcher = p.matcher( line );
+			if ( matcher.matches() ) {
+				matches = true;
+			}
+		}
+		return matches;
+	}
+}