Change code lines order to avoid pointer error

Context

Fix test following aidge_core#207 (closed) changes.

unit_tests/Test_TensorImpl.cpp

@@ -37,7 +37,7 @@ TEST_CASE("CUDA test") {
     }
 
     // Allocate device memory
-    float *d_a, *d_b, *d_out; 
+    float *d_a, *d_b, *d_out;
     cudaMalloc(reinterpret_cast<void**>(&d_a), sizeof(float) * N);
     cudaMalloc(reinterpret_cast<void**>(&d_b), sizeof(float) * N);
     cudaMalloc(reinterpret_cast<void**>(&d_out), sizeof(float) * N);
@@ -46,9 +46,9 @@ TEST_CASE("CUDA test") {
     cudaMemcpy(d_a, a, sizeof(float) * N, cudaMemcpyHostToDevice);
     cudaMemcpy(d_b, b, sizeof(float) * N, cudaMemcpyHostToDevice);
 
-    // Executing kernel 
+    // Executing kernel
     vector_add(d_out, d_a, d_b, N);
-    
+
     // Transfer data back to host memory
     cudaMemcpy(out, d_out, sizeof(float) * N, cudaMemcpyDeviceToHost);
 
@@ -71,7 +71,6 @@ TEST_CASE("CUDA test") {
 TEST_CASE("Tensor creation", "[Connector]") {
     SECTION("from const array") {
         Tensor x;
-        x.setBackend("cuda");
         x = Array3D<int,2,2,2>{
         {
             {
@@ -83,6 +82,7 @@ TEST_CASE("Tensor creation", "[Connector]") {
                 {7, 8}
             }
         }};
+        x.setBackend("cuda");
 
         REQUIRE(x.nbDims() == 3);
         REQUIRE(x.dims()[0] == 2);