Add disabled Subclass decoding tests

realtimedb/src/test/kotlin/de/sipgate/federmappe/realtimedb/SubclassDecodingTests.kt

@@ -0,0 +1,51 @@
+package de.sipgate.federmappe.realtimedb
+
+import com.google.firebase.database.DataSnapshot
+import io.mockk.every
+import io.mockk.mockk
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.Serializable
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertInstanceOf
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Test
+
+@Disabled
+@OptIn(ExperimentalSerializationApi::class)
+class SubclassDecodingTests {
+
+    @Serializable
+    data class A(val b: String)
+
+    @Test
+    fun nestedDataStructureDecodingTest() {
+        @Serializable
+        data class TestClass(val a: A)
+
+        val bPropertyMock = mockk<DataSnapshot> {
+            every { value } returns "Some String"
+            every { key } returns "b"
+            every { children } returns emptyList()
+        }
+
+        val aPropertyMock = mockk<DataSnapshot> {
+            every { value } returns null
+            every { key } returns "a"
+            every { children } returns emptyList()
+        }
+
+        val testClassMock = mockk<DataSnapshot> {
+            every { key } returns null
+            every { value } returns null
+            every { children } returns listOf(aPropertyMock)
+            every { child("a") } returns aPropertyMock
+        }
+
+        val result = testClassMock.toObjectWithSerializer(TestClass.serializer())
+
+        assertInstanceOf(TestClass::class.java, result)
+        assertNotNull(result.a)
+        assertEquals("Some String", result.a.b)
+    }
+}