Improve <stdio_ext.h> testing.
I almost fixed a non-bug. Add a test to prevent me from doing that.
Change-Id: I4a1dc13e603a7a377bdaee2e78132015087f7107
diff --git a/tests/stdio_ext_test.cpp b/tests/stdio_ext_test.cpp
index 3dbc485..950c7ed 100644
--- a/tests/stdio_ext_test.cpp
+++ b/tests/stdio_ext_test.cpp
@@ -34,7 +34,13 @@
TEST(stdio_ext, __fbufsize) {
FILE* fp = fopen("/proc/version", "r");
+ // Initially, there's no buffer in case the first thing you do is disable buffering.
+ ASSERT_EQ(0U, __fbufsize(fp));
+
+ // A read forces a buffer to be created.
char buf[128];
+ fgets(buf, sizeof(buf), fp);
+ ASSERT_EQ(1024U, __fbufsize(fp));
ASSERT_EQ(0, setvbuf(fp, buf, _IOFBF, 1));
ASSERT_EQ(1U, __fbufsize(fp));