diff --git a/pkg/config/json_test.go b/pkg/config/json_test.go
index 1a8099f5..a0cface1 100644
--- a/pkg/config/json_test.go
+++ b/pkg/config/json_test.go
@@ -114,6 +114,31 @@ var jsonTests = map[string]jsonTest{
 	},
 }
 
+type invalidJSONTest struct {
+	json string
+}
+
+var invalidJSONTests = map[string]invalidJSONTest{
+	"TestEmptyBootloaderKind": {
+		json: `{"vcpus":3,"memoryBytes":4000000000,"bootloader":{"kind":"empty",VmlinuzPath":"/vmlinuz","KernelCmdLine":"/initrd","InitrdPath":"console=hvc0"}}`,
+	},
+	"TestInvalidBootloaderKind": {
+		json: `{"vcpus":3,"memoryBytes":4000000000,"bootloader":{"kind":"invalid",VmlinuzPath":"/vmlinuz","KernelCmdLine":"/initrd","InitrdPath":"console=hvc0"}}`,
+	},
+	"TestMissingBootloaderKind": {
+		json: `{"vcpus":3,"memoryBytes":4000000000,"bootloader":{"VmlinuzPath":"/vmlinuz","KernelCmdLine":"/initrd","InitrdPath":"console=hvc0"}}`,
+	},
+	"TestEmptyDeviceKind": {
+		json: `{"vcpus":3,"memoryBytes":4000000000,"bootloader":{"kind":"linuxBootloader","VmlinuzPath":"/vmlinuz","KernelCmdLine":"/initrd","InitrdPath":"console=hvc0"},"devices":[{"kind":"","DevName":"virtio-blk","ImagePath":"/virtioblk1","ReadOnly":false,"DeviceIdentifier":""}]}`,
+	},
+	"TestInvalidDeviceKind": {
+		json: `{"vcpus":3,"memoryBytes":4000000000,"bootloader":{"kind":"linuxBootloader","VmlinuzPath":"/vmlinuz","KernelCmdLine":"/initrd","InitrdPath":"console=hvc0"},"devices":[{"kind":"invalid","DevName":"virtio-blk","ImagePath":"/virtioblk1","ReadOnly":false,"DeviceIdentifier":""}]}`,
+	},
+	"TestMissingDeviceKind": {
+		json: `{"vcpus":3,"memoryBytes":4000000000,"bootloader":{"kind":"linuxBootloader","VmlinuzPath":"/vmlinuz","KernelCmdLine":"/initrd","InitrdPath":"console=hvc0"},"devices":[{"DevName":"virtio-blk","ImagePath":"/virtioblk1","ReadOnly":false,"DeviceIdentifier":""}]}`,
+	},
+}
+
 func TestJSON(t *testing.T) {
 	t.Run("json", func(t *testing.T) {
 		for name := range jsonTests {
@@ -122,6 +147,12 @@ func TestJSON(t *testing.T) {
 				testJSON(t, &test)
 			})
 		}
+		for name := range invalidJSONTests {
+			t.Run(name, func(t *testing.T) {
+				test := invalidJSONTests[name]
+				testInvalidJSON(t, &test)
+			})
+		}
 
 	})
 }
@@ -139,6 +170,12 @@ func testJSON(t *testing.T, test *jsonTest) {
 	require.Equal(t, *vm, unmarshalledVM)
 }
 
+func testInvalidJSON(t *testing.T, test *invalidJSONTest) {
+	var vm VirtualMachine
+	err := json.Unmarshal([]byte(test.json), &vm)
+	require.Error(t, err)
+}
+
 func newLinuxVM(*testing.T) *VirtualMachine {
 	bootloader := NewLinuxBootloader("/vmlinuz", "/initrd", "console=hvc0")
 	vm := NewVirtualMachine(3, 4_000_000_000, bootloader)