add test for log2_approx()

openair1/PHY/TOOLS/tests/CMakeLists.txt

@@ -9,3 +9,9 @@ target_link_libraries(benchmark_rotate_vector PRIVATE benchmark::benchmark UTIL
 add_dependencies(tests benchmark_rotate_vector)
 add_test(NAME benchmark_rotate_vector
   COMMAND ./benchmark_rotate_vector)
+
+add_executable(test_log2_approx test_log2_approx.cpp ../log2_approx.c)
+target_link_libraries(test_log2_approx PRIVATE GTest::gtest LOG minimal_lib)
+add_dependencies(tests test_log2_approx)
+add_test(NAME test_log2_approx
+  COMMAND ./test_log2_approx)

openair1/PHY/TOOLS/tests/test_log2_approx.cpp

@@ -0,0 +1,24 @@
+#include <gtest/gtest.h>
+extern "C" {
+#include "openair1/PHY/TOOLS/tools_defs.h"
+#include "common/utils/LOG/log.h"
+}
+#include <cmath>
+
+uint8_t log2_approx_ref(uint32_t x)
+{
+  return std::round(std::log2(x));
+}
+
+TEST(log2_approx_ref, complete)
+{
+  for (uint32_t i = 0; i < UINT32_MAX; i++)
+    EXPECT_EQ(log2_approx(i), log2_approx_ref(i));
+}
+
+int main(int argc, char **argv)
+{
+  logInit();
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}