Added basic test and disclaimer

README.md

@@ -2,6 +2,8 @@
 
 You must have the ArrayFire library installed on your system.
 
+*Disclaimer: Eclipse Aidge is not affiliated with or endorsed by ArrayFire. The ArrayFire literal mark is used under a limited license granted by ArrayFire the trademark holder in the United States and other countries.*
+
 ## Pip installation
 
 You will need to install first the aidge_core library before installing aidge_backend_arrayfire.

unit_tests/Test_arrayfire.cpp

+/********************************************************************************
+ * Copyright (c) 2023 CEA-List
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ ********************************************************************************/
+
+#include <catch2/catch_test_macros.hpp>
+#include <arrayfire.h>
+ 
+void testBackend()
+{
+    af::info();
+    af_print(af::randu(5, 4));
+}
+ 
+TEST_CASE("[arrayfire] arrayfire") {
+    try {
+        printf("Trying CPU Backend\n");
+        af::setBackend(AF_BACKEND_CPU);
+        testBackend();
+    } catch (af::exception& e) {
+        printf("Caught exception when trying CPU backend\n");
+        fprintf(stderr, "%s\n", e.what());
+    }
+ 
+    try {
+        printf("Trying oneAPI Backend\n");
+        af::setBackend(AF_BACKEND_ONEAPI);
+        testBackend();
+    } catch (af::exception& e) {
+        printf("Caught exception when trying oneAPI backend\n");
+        fprintf(stderr, "%s\n", e.what());
+    }
+ 
+    try {
+        printf("Trying CUDA Backend\n");
+        af::setBackend(AF_BACKEND_CUDA);
+        testBackend();
+    } catch (af::exception& e) {
+        printf("Caught exception when trying CUDA backend\n");
+        fprintf(stderr, "%s\n", e.what());
+    }
+ 
+    try {
+        printf("Trying OpenCL Backend\n");
+        af::setBackend(AF_BACKEND_OPENCL);
+        testBackend();
+    } catch (af::exception& e) {
+        printf("Caught exception when trying OpenCL backend\n");
+        fprintf(stderr, "%s\n", e.what());
+    }
+}