--- /dev/null
+++ Libc/Libc-1272.250.1/tests/stdio.c
@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <err.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/resource.h>
+
+#include <darwintest.h>
+
+#define FILE_LIMIT 100
+
+T_DECL(stdio_PR_22813396, "STREAM_MAX is affected by changes to RLIMIT_NOFILE")
+{
+	struct rlimit theLimit;
+	getrlimit( RLIMIT_NOFILE, &theLimit );
+	theLimit.rlim_cur = FILE_LIMIT;
+	setrlimit( RLIMIT_NOFILE, &theLimit );
+
+	long stream_max = sysconf(_SC_STREAM_MAX);
+	T_EXPECT_EQ_LONG(stream_max, (long)FILE_LIMIT, "stream_max = FILE_LIMIT");
+
+	FILE *f;
+	for(int i = 3; i < stream_max; i++) {
+		if((f = fdopen(0, "r")) == NULL) {
+			T_FAIL("Failed after %d streams", i);
+		}
+	}
+
+	f = fdopen(0, "r");
+	T_EXPECT_NULL(f, "fdopen fail after stream_max streams");
+
+	theLimit.rlim_cur = FILE_LIMIT + 1;
+	setrlimit( RLIMIT_NOFILE, &theLimit );
+
+	f = fdopen(0, "r");
+	T_EXPECT_NOTNULL(f, "fdopen succeed after RLIMIT_NOFILE increased");
+}
+
+T_DECL(stdio_PR_22813396_close, "STREAM_MAX is enforced properly after fclose")
+{
+	struct rlimit theLimit;
+	getrlimit( RLIMIT_NOFILE, &theLimit );
+	theLimit.rlim_cur = FILE_LIMIT;
+	setrlimit( RLIMIT_NOFILE, &theLimit );
+
+	long stream_max = sysconf(_SC_STREAM_MAX);
+	T_EXPECT_EQ_LONG(stream_max, (long)FILE_LIMIT, "stream_max = FILE_LIMIT");
+
+	FILE *f;
+	for(int i = 3; i < stream_max - 1; i++) {
+		if((f = fdopen(0, "r")) == NULL) {
+			T_FAIL("Failed after %d streams", i);
+		}
+	}
+
+	// the last stream is for dup(0), it needs to be fclose'd
+	FILE *dupf = NULL;
+	T_EXPECT_NOTNULL(dupf = fdopen(dup(0), "r"), NULL);
+
+	T_EXPECT_NULL(f = fdopen(0, "r"), "fdopen fail after stream_max streams");
+
+	T_EXPECT_POSIX_ZERO(fclose(dupf), "fclose succeeds");
+
+	f = fdopen(0, "r");
+	T_WITH_ERRNO; T_EXPECT_NOTNULL(f, "fdopen succeed after fclose");
+}
+