--- /dev/null
+++ Libc/Libc-1244.1.7/tests/readpassphrase.c
@@ -0,0 +1,25 @@
+#include <darwintest.h>
+
+#include <unistd.h>
+#include <readpassphrase.h>
+
+T_DECL(readpassphrase_stdin, "readpassphrase_stdin")
+{
+	int stdin_pipe[2] = { 0 };
+	char pwd[] = "ishouldnotbedoingthis\n";
+	char buff[128];
+
+	T_ASSERT_POSIX_ZERO(pipe(stdin_pipe),
+			"must be able to create a pipe");
+	T_ASSERT_EQ(STDIN_FILENO, dup2(stdin_pipe[0], STDIN_FILENO),
+			"must be able to re-register the read end of the pipe with STDIN_FILENO");
+	T_ASSERT_EQ((ssize_t) sizeof(pwd), write(stdin_pipe[1], pwd, sizeof(pwd)),
+			"must be able to write into the pipe");
+	T_ASSERT_EQ((void *) buff, (void *) readpassphrase("", buff, sizeof(buff), RPP_STDIN),
+			"readpassphrase must return its buffer argument on success");
+	// readpassphrase eats newlines
+	pwd[sizeof(pwd) - 2] = 0;
+	T_ASSERT_EQ_STR(buff, pwd,
+			"readpassphrase with RPP_STDIN must capture stdin");
+}
+