Collect the DB schemas in the model via MTable

src/test/java/io/ebeaninternal/dbmigration/model/ModelContainerTest.java

@@ -10,6 +10,7 @@ import io.ebeaninternal.dbmigration.migrationreader.MigrationXmlReader;
 import org.junit.Test;
 
 import java.util.List;
+import java.util.Set;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -153,6 +154,22 @@ public class ModelContainerTest {
     container.applyChange(dropHistoryTable);
   }
 
+  @Test
+  public void getSchemas() {
+
+    MTable t0 = new MTable("foo.one");
+    MTable t1 = new MTable("foo.two");
+    MTable t2 = new MTable("bar.three");
+
+    ModelContainer container = new ModelContainer();
+    container.addTable(t0);
+    container.addTable(t1);
+    container.addTable(t2);
+
+    final Set<String> schemas = container.getSchemas();
+    assertThat(schemas).containsExactly("bar","foo");
+  }
+
   private ModelContainer container_2_1() {
     ModelContainer container = new ModelContainer();
     container.apply(mig("2.0.model.xml"), ver("2.0"));