diff --git a/apps/aqhome-react/main.c b/apps/aqhome-react/main.c
index 24b9321..f20b4db 100644
--- a/apps/aqhome-react/main.c
+++ b/apps/aqhome-react/main.c
@@ -19,6 +19,7 @@
 
 #include "aqhome/aqhome.h"
 #include "aqhome/data/path-t.h"
+#include "aqhome/data/vars-t.h"
 
 #include <gwenhywfar/gwenhywfar.h>
 #include <gwenhywfar/args.h>
@@ -315,6 +316,12 @@ int _testModules(int argc, char **argv)
     return 2;
   }
 
+  rv=AQH_Vars_AddTests(TestFramework_GetModulesRoot(tf));
+  if (rv<0) {
+    fprintf(stderr, "Adding module \"vars\" failed.\n");
+    return 2;
+  }
+
   argc--;
   argv++;
   rv=TestFramework_Run(tf, argc, argv);
diff --git a/aqhome/data/0BUILD b/aqhome/data/0BUILD
index c0fdb7a..61d5297 100644
--- a/aqhome/data/0BUILD
+++ b/aqhome/data/0BUILD
@@ -87,6 +87,8 @@
     <extradist>
       path-t.h
       path-t.c
+      vars-t.h
+      vars-t.c
     </extradist>
 
 
diff --git a/aqhome/data/vars-t.c b/aqhome/data/vars-t.c
new file mode 100644
index 0000000..e36ca32
--- /dev/null
+++ b/aqhome/data/vars-t.c
@@ -0,0 +1,127 @@
+/****************************************************************************
+ * This file is part of the project Gwenhywfar.
+ * AqHome (c) by 2024 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+/* This file is included by "path.c" */
+
+
+#include <gwenhywfar/testframework.h>
+#include "vars-t.h"
+
+
+#ifdef AQHOME_ENABLE_TESTCODE
+
+
+/* ------------------------------------------------------------------------------------------------
+ * forward declarations
+ * ------------------------------------------------------------------------------------------------
+ */
+
+static int GWENHYWFAR_CB test1(GWEN_TEST_MODULE *mod);
+
+
+
+/* ------------------------------------------------------------------------------------------------
+ * implementations
+ * ------------------------------------------------------------------------------------------------
+ */
+
+int AQH_Vars_AddTests(GWEN_TEST_MODULE *mod)
+{
+  GWEN_TEST_MODULE *newMod;
+
+  newMod=GWEN_Test_Module_AddModule(mod, "AQH_Vars", NULL);
+
+  GWEN_Test_Module_AddTest(newMod, "test 1: setCharValue", test1, NULL);
+
+  return 0;
+}
+
+
+
+int test1(GWEN_UNUSED GWEN_TEST_MODULE *mod)
+{
+  AQH_VARS *vtRoot;
+  AQH_VARS *vtVar;
+  AQH_VARS *vtValue;
+  int rv;
+
+  vtRoot=AQH_Vars_CreateGroup("Root");
+  rv=AQH_Vars_SetCharValue(vtRoot, 0, "var1", "value1");
+  if (rv<0) {
+    DBG_ERROR(AQH_LOGDOMAIN, "here (%d)", rv);
+    return rv;
+  }
+
+  vtVar=AQH_Vars_Tree2_GetFirstChild(vtRoot);
+  if (vtVar==NULL) {
+    DBG_ERROR(AQH_LOGDOMAIN, "No variable");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+  if (AQH_Vars_Tree2_GetNext(vtVar)) {
+    DBG_ERROR(AQH_LOGDOMAIN, "More than one child");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+  if (vtVar->dataType!=AQH_Vars_DataType_Variable) {
+    DBG_ERROR(AQH_LOGDOMAIN, "First child of root node is not a variable");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+  if (!(vtVar->data.dataString && -1!=strcasecmp(vtVar->data.dataString, "var1"))) {
+    DBG_ERROR(AQH_LOGDOMAIN, "First child of root node is not the variable we set");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+
+  vtValue=AQH_Vars_Tree2_GetFirstChild(vtVar);
+  if (vtValue==NULL) {
+    DBG_ERROR(AQH_LOGDOMAIN, "No value");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+  if (AQH_Vars_Tree2_GetNext(vtValue)) {
+    DBG_ERROR(AQH_LOGDOMAIN, "More than one value");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+  if (vtValue->dataType!=AQH_Vars_DataType_ValueString) {
+    DBG_ERROR(AQH_LOGDOMAIN, "First child of root node is not a string value");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+  if (!(vtValue->data.dataString && -1!=strcasecmp(vtValue->data.dataString, "value1"))) {
+    DBG_ERROR(AQH_LOGDOMAIN, "First child of variable node is not the value we set");
+    AQH_Vars_free(vtRoot);
+    return GWEN_ERROR_GENERIC;
+  }
+
+  AQH_Vars_free(vtRoot);
+
+  return 0;
+}
+
+
+
+#else
+
+int AQH_Vars_AddTests(GWEN_TEST_MODULE *mod)
+{
+  DBG_ERROR(GWEN_LOGDOMAIN, "AqHome was compiled without test code enabled.");
+  return GWEN_ERROR_GENERIC;
+}
+
+
+#endif
diff --git a/aqhome/data/vars-t.h b/aqhome/data/vars-t.h
new file mode 100644
index 0000000..902cc4e
--- /dev/null
+++ b/aqhome/data/vars-t.h
@@ -0,0 +1,25 @@
+/****************************************************************************
+ * This file is part of the project Gwenhywfar.
+ * AqHome (c) by 2024 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_VARS_T_H
+#define AQH_VARS_T_H
+
+
+#include <gwenhywfar/gwenhywfarapi.h>
+#include <gwenhywfar/testframework.h>
+
+
+
+/**
+ * Tests for "Vars" module.
+ */
+AQHOME_API int AQH_Vars_AddTests(GWEN_TEST_MODULE *mod);
+
+
+
+#endif