Add Helper Entity

src/test/kotlin/fr/postgresjson/ConnectionTest.kt

@@ -0,0 +1,65 @@
+package fr.postgresjson
+
+import fr.postgresjson.connexion.Connection
+import fr.postgresjson.entity.IdEntity
+import org.junit.jupiter.api.*
+import org.junit.jupiter.api.Assertions.assertTrue
+import java.io.File
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class ConnectionTest() {
+    private class ObjTest(var name: String): IdEntity()
+    private class ObjTest2(var title: String, var test: ObjTest?): IdEntity()
+
+    private lateinit var connection: Connection
+
+    fun getConnextion(): Connection {
+        return Connection(database = "test", username = "test", password = "test")
+    }
+
+    @BeforeAll
+    fun beforeAll() {
+        val initSQL = File(this::class.java.getResource("/fixtures/init.sql").toURI())
+        val promise = getConnextion().connect().sendQuery(initSQL.readText())
+        promise.join()
+    }
+
+    @BeforeEach
+    fun before() {
+        connection = getConnextion()
+    }
+
+    @AfterAll
+    fun afterAll() {
+        val downSQL = File(this::class.java.getResource("/fixtures/down.sql").toURI())
+        getConnextion().connect().sendQuery(downSQL.readText()).join()
+    }
+
+    @Test
+    fun getObject() {
+        val obj: ObjTest? = connection.selectOne<Int?, ObjTest>("select to_json(a) from test a limit 1")
+        assertTrue(obj is ObjTest)
+        assertTrue(obj!!.id == 1)
+    }
+
+    @Test
+    fun getExistingObject() {
+        val objs: List<ObjTest2> = connection.select("""
+        select
+            json_agg(j)
+            FROM (
+            SELECT
+                t.id, t.title,
+                t2 as test
+            from test2 t
+            JOIN test t2 ON t.test_id = t2.id
+        ) j;
+        """
+        )
+        assertTrue(objs !== null)
+        assertTrue(objs is List<ObjTest2>)
+        assertTrue(objs!!.size == 2)
+        assertTrue(objs[0].id == 1)
+        assertTrue(objs[0].test!!.id == 1)
+    }
+}