From 58a2966499b3835b24c153337b90b87707f76a5a Mon Sep 17 00:00:00 2001
From: Thomas Schlichter <thomas.schlichter@iis.fraunhofer.de>
Date: Mon, 12 Aug 2024 13:21:06 +0200
Subject: [PATCH] add test for log2_approx()

---
 openair1/PHY/TOOLS/tests/CMakeLists.txt       |  6 +++++
 openair1/PHY/TOOLS/tests/test_log2_approx.cpp | 24 +++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 openair1/PHY/TOOLS/tests/test_log2_approx.cpp

diff --git a/openair1/PHY/TOOLS/tests/CMakeLists.txt b/openair1/PHY/TOOLS/tests/CMakeLists.txt
index 2822e058fd..591dfcd430 100644
--- a/openair1/PHY/TOOLS/tests/CMakeLists.txt
+++ b/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)
diff --git a/openair1/PHY/TOOLS/tests/test_log2_approx.cpp b/openair1/PHY/TOOLS/tests/test_log2_approx.cpp
new file mode 100644
index 0000000000..23cae706f6
--- /dev/null
+++ b/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();
+}