diff --git a/tests/kded/serializerdata/corruptConfig.json b/tests/kded/serializerdata/corruptConfig.json
new file mode 100644
--- /dev/null
+++ b/tests/kded/serializerdata/corruptConfig.json
@@ -0,0 +1,35 @@
+[
+    {
+        "enabled": true,
+        "id": "OUTPUT-1",
+        "metadata": {
+            "name": "OUTPUT-1"
+        },
+        "mode": {
+            "refresh": 60.0,
+            "size": {
+                "height": 1080,
+                "width": 1920
+            }
+        },
+        "pos": {
+            "x": 0,
+            "y": 0
+        },
+        "primary": true,
+        "rotation": 1
+    },
+    {
+        "enabled": true,
+        "id": "OUTPUT-2",
+        "metadata": {
+            "name": "OUTPUT-2"
+        },
+        "mode": {
+            "refresh": 60,
+            "size": {
+                "height": 1024,
+                "width": 1280
+            }
+        },
+        "po
\ No newline at end of file
diff --git a/tests/kded/serializerdata/corruptEmptyConfig.json b/tests/kded/serializerdata/corruptEmptyConfig.json
new file mode 100644
--- /dev/null
+++ b/tests/kded/serializerdata/corruptEmptyConfig.json
@@ -0,0 +1,2 @@
+[
+]
diff --git a/tests/kded/serializerdata/corruptUselessConfig.json b/tests/kded/serializerdata/corruptUselessConfig.json
new file mode 100644
--- /dev/null
+++ b/tests/kded/serializerdata/corruptUselessConfig.json
@@ -0,0 +1,31 @@
+[
+    {
+        "enabled": true,
+        "pos": {
+            "x": 0,
+            "y": 0
+        },
+        "primary": true,
+        "rotation": 1
+    },
+    {
+        "enabled": true,
+        "id": "OUTPUT-2",
+        "metadata": {
+            "name": "OUTPUT-2"
+        },
+        "mode": {
+            "refresh": 60,
+            "size": {
+                "height": 1024,
+                "width": 1280
+            }
+        },
+        "pos": {
+            "x": 1920,
+            "y": 0
+        },
+        "primary": false,
+        "rotation": 1
+    }
+]
diff --git a/tests/kded/serializertest.cpp b/tests/kded/serializertest.cpp
--- a/tests/kded/serializertest.cpp
+++ b/tests/kded/serializertest.cpp
@@ -39,6 +39,10 @@
     void testTwoScreenConfig();
     void testRotatedScreenConfig();
     void testDisabledScreenConfig();
+    void testConfig404();
+    void testCorruptConfig();
+    void testCorruptEmptyConfig();
+    void testCorruptUselessConfig();
 
 private:
     KScreen::ConfigPtr createConfig(bool output1Connected, bool output2Conected);
@@ -201,6 +205,41 @@
     QCOMPARE(screen->currentSize(), QSize(1920, 1280));
 }
 
+void TestSerializer::testConfig404()
+{
+    KScreen::ConfigPtr config = createConfig(true, true);
+    config = Serializer::config(config, QStringLiteral("filenotfoundConfig.json"));
+    QVERIFY(!config);
+    QVERIFY(config.isNull());
+}
+
+void TestSerializer::testCorruptConfig()
+{
+    KScreen::ConfigPtr config = createConfig(true, true);
+    config = Serializer::config(config, QStringLiteral("corruptConfig.json"));
+    QVERIFY(config);
+    QCOMPARE(config->outputs().count(), 2);
+    QVERIFY(config->isValid());
+}
+
+void TestSerializer::testCorruptEmptyConfig()
+{
+    KScreen::ConfigPtr config = createConfig(true, true);
+    config = Serializer::config(config, QStringLiteral("corruptEmptyConfig.json"));
+    QVERIFY(config);
+    QCOMPARE(config->outputs().count(), 2);
+    QVERIFY(config->isValid());
+}
+
+void TestSerializer::testCorruptUselessConfig()
+{
+    KScreen::ConfigPtr config = createConfig(true, true);
+    config = Serializer::config(config, QStringLiteral("corruptUselessConfig.json"));
+    QVERIFY(config);
+    QCOMPARE(config->outputs().count(), 2);
+    QVERIFY(config->isValid());
+}
+
 QTEST_MAIN(TestSerializer)
 
 #include "serializertest.moc"
\ No newline at end of file