Ensure library file starts with 'lib/' prefix.

Test: ApkParsing_test.cpp
Change-Id: I3a1ac8c10b315e49ec668ff357aafe861cd2d0fe
diff --git a/libs/androidfw/tests/ApkParsing_test.cpp b/libs/androidfw/tests/ApkParsing_test.cpp
index 62e88c6..ac1dc9b 100644
--- a/libs/androidfw/tests/ApkParsing_test.cpp
+++ b/libs/androidfw/tests/ApkParsing_test.cpp
@@ -74,4 +74,10 @@
   auto lastSlash = util::ValidLibraryPathLastSlash(path, false, false);
   ASSERT_THAT(lastSlash, IsNull());
 }
+
+TEST(ApkParsingTest, InvalidPrefix) {
+  const char* path = "assets/libhello.so";
+  auto lastSlash = util::ValidLibraryPathLastSlash(path, false, false);
+  ASSERT_THAT(lastSlash, IsNull());
+}
 }
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