adds jackson yaml dependency and database serializazion test

pom.xml

@@ -57,6 +57,11 @@
             <artifactId>jackson-dataformat-xml</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-yaml</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
         <dependency>
             <groupId>com.fasterxml.woodstox</groupId>
             <artifactId>woodstox-core</artifactId>

src/test/kotlin/unibz.cs.semint.kprime/domain/ChangeSetTest.kt → src/test/kotlin/unibz.cs.semint.kprime/usecase/serialize/XMLSerializerChangeSetTest.kt

-package unibz.cs.semint.kprime.domain
+package unibz.cs.semint.kprime.usecase.serialize
 
 import junit.framework.Assert.assertEquals
 import org.junit.Test
 import unibz.cs.semint.kprime.adapter.service.XMLSerializerJacksonAdapter
+import unibz.cs.semint.kprime.domain.QueryTest
 import unibz.cs.semint.kprime.domain.dml.ChangeSet
-import unibz.cs.semint.kprime.domain.dml.CreateMapping
 import unibz.cs.semint.kprime.domain.dml.CreateView
 import unibz.cs.semint.kprime.usecase.common.XMLSerializeUseCase
 
-class ChangeSetTest  {
+class XMLSerializerChangeSetTest  {
 
 
     @Test

src/test/kotlin/unibz.cs.semint.kprime/usecase/serialize/YAMLSerializerDatabaseTest.kt

+package unibz.cs.semint.kprime.usecase.serialize
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory
+import org.junit.Test
+import unibz.cs.semint.kprime.domain.ddl.Database
+import unibz.cs.semint.kprime.domain.ddl.Schema
+import unibz.cs.semint.kprime.domain.ddl.Table
+import java.io.File
+import java.io.StringWriter
+import kotlin.test.assertEquals
+
+class YAMLSerializerDatabaseTest {
+
+    @Test
+    fun test_database_serialize_with_two_empty_tables() {
+        // given
+        val database = Database()
+        database.id = "iddb"
+        database.name = "dbname"
+        database.schema = Schema()
+        database.schema.id = "idschema"
+        database.schema.tables().add(Table())
+        database.schema.tables().add(Table())
+
+        val objectMapper = ObjectMapper(YAMLFactory())
+        val outWriter = StringWriter()
+        objectMapper.writeValue(outWriter,database)
+        assertEquals("""
+            ---
+            name: "dbname"
+            id: "iddb"
+            schema:
+              name: ""
+              id: "idschema"
+              tables:
+              - name: ""
+                id: ""
+                view: ""
+                condition: ""
+                columns: []
+              - name: ""
+                id: ""
+                view: ""
+                condition: ""
+                columns: []
+              constraints: []
+            mappings: []
+
+        """.trimIndent(),outWriter.toString())
+    }
+}
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