Consistently use #if defined(__BIONIC__) in tests.
I've also switched some tests to be positive rather than negative,
because !defined is slightly harder to reason about and there are
only two cases: bionic and glibc.
Change-Id: I8d3ac40420ca5aead3e88c69cf293f267273c8ef
diff --git a/tests/unistd_test.cpp b/tests/unistd_test.cpp
index 2b51aad..ff05039 100644
--- a/tests/unistd_test.cpp
+++ b/tests/unistd_test.cpp
@@ -67,7 +67,7 @@
ASSERT_EQ(reinterpret_cast<void*>(-1), sbrk(-(current_brk + 1)));
ASSERT_EQ(ENOMEM, errno);
-#if !defined(__GLIBC__)
+#if defined(__BIONIC__)
// The maximum negative value is an interesting special case that glibc gets wrong.
ASSERT_EQ(reinterpret_cast<void*>(-1), sbrk(PTRDIFF_MIN));
ASSERT_EQ(ENOMEM, errno);