chore: Add a basic test for Pop Operator

unit_tests/operator/Test_PopImpl.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 <memory>
+
+#include "aidge/data/Tensor.hpp"
+#include "aidge/operator/Pop.hpp"
+#include "aidge/utils/TensorUtils.hpp"
+
+using Aidge::Tensor;
+using Aidge::Pop;
+
+TEST_CASE("[cpu/operator] Pop(forward)", "[Pop][CPU]") {
+    std::shared_ptr<Tensor> pop1 = std::make_shared<Tensor>(Aidge::Array1D<int,3>{{4,5,6}});
+    std::shared_ptr<Tensor> pop2 = std::make_shared<Tensor>(Aidge::Array1D<int,3>{{1,2,3}});
+    std::shared_ptr<Tensor> input = std::make_shared<Tensor>(Aidge::Array2D<int,2,3>{{{1,2,3}, {4,5,6}}});
+
+    auto pop = Aidge::Pop("pop");
+    pop->getOperator()->associateInput(0, input);
+    pop->getOperator()->setBackend("cpu");
+    pop->getOperator()->setDataType(Aidge::DataType::Int32);
+
+    REQUIRE_NOTHROW(pop->forward());
+    REQUIRE(*std::static_pointer_cast<Aidge::OperatorTensor>(pop->getOperator())->getOutput(0) == *pop2);
+    REQUIRE_NOTHROW(pop->forward());
+    REQUIRE(*std::static_pointer_cast<Aidge::OperatorTensor>(pop->getOperator())->getOutput(0) == *pop1);
+}