local_utils: add CastEnumToInteger()

In certain debugging contexts, its helpful to
output the raw value of an enum variable.
Add CastEnumToInteger(), to meet this need.

Bug: 32315504
Test: ./runtests.sh (on angler)
Change-Id: Ie19f6643aafd733beab73de2cb50071db208fb7c

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/local_utils_unittest.cpp b/tests/local_utils_unittest.cpp
index d0955ca..50898d3 100644
--- a/tests/local_utils_unittest.cpp
+++ b/tests/local_utils_unittest.cpp
@@ -25,10 +25,26 @@
 namespace android {
 namespace wifilogd {
 
+using local_utils::CastEnumToInteger;
 using local_utils::CopyFromBufferOrDie;
 using local_utils::GetMaxVal;
 using local_utils::IsAsciiPrintable;
 
+TEST(LocalUtilsTest, CastEnumToIntegerWorksForValidEnumValues) {
+  enum class basic_enum { VALUE0, VALUE1 };
+  EXPECT_EQ(0, CastEnumToInteger(basic_enum::VALUE0));
+  EXPECT_EQ(1, CastEnumToInteger(basic_enum::VALUE1));
+}
+
+TEST(LocalUtilsTest, CastEnumToIntegerWorksForInvalidEnumValues) {
+  enum class basic_enum : int { VALUE0, VALUE1 };
+  constexpr int invalid_enum_value = 2;
+  EXPECT_EQ(0, CastEnumToInteger(basic_enum::VALUE0));
+  EXPECT_EQ(1, CastEnumToInteger(basic_enum::VALUE1));
+  EXPECT_EQ(2, CastEnumToInteger(CopyFromBufferOrDie<basic_enum>(
+                   &invalid_enum_value, sizeof(invalid_enum_value))));
+}
+
 TEST(LocalUtilsTest, CopyFromBufferOrDieCopiesData) {
   struct Message {
     int a;