tests: add new test suite for the modern probe

Signed-off-by: Andrea Terzolo <andrea.terzolo@polito.it>

userspace/libscap/test/CMakeLists.txt

@@ -22,6 +22,12 @@ set(LIBSCAP_UNIT_TESTS_SOURCES
     scap_event.ut.cpp
 )
 
+# Modern BPF is supported only on kernel versions >= 5.8.
+# To compile these tests you need to use the Cmake option `BUILD_LIBSCAP_MODERN_BPF=On`
+if(BUILD_LIBSCAP_MODERN_BPF)
+	list(APPEND LIBSCAP_UNIT_TESTS_SOURCES ./test_suites/engines/modern_bpf/modern_bpf.cpp)
+endif()
+
 if (BUILD_LIBSCAP_GVISOR)
 	list(APPEND LIBSCAP_UNIT_TESTS_SOURCES scap_gvisor_parsers.ut.cpp)
 	include_directories(../engine/gvisor)

userspace/libscap/test/README.md

@@ -0,0 +1,20 @@
+# Scap tests
+
+## Compile tests
+
+```bash
+cmake -DUSE_BUNDLED_DEPS=On -DBUILD_BPF=True -DCREATE_TEST_TARGETS=On -DBUILD_LIBSCAP_GVISOR=Off ..
+make unit-test-libscap
+```
+
+You can add tests for specific engines using their Cmake options:
+- `-DBUILD_LIBSCAP_MODERN_BPF=On`
+- `-BUILD_LIBSCAP_GVISOR=On`
+
+## Run tests
+
+From the build directory:
+
+```bash
+sudo ./libscap/test/unit-test-libscap
+```