1 files changed, 28 insertions, 0 deletions
diff --git a/tests/unistd/isatty.c b/tests/unistd/isatty.c
new file mode 100644
index 00000000..cc1ff641
--- /dev/null
+++ b/tests/unistd/isatty.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int main() {
+  printf("read: %d\n", isatty(open("/read", O_RDONLY)));
+  printf("errno: %d\n", errno);
+  errno = 0;
+
+  printf("write: %d\n", isatty(open("/write", O_WRONLY)));
+  printf("errno: %d\n", errno);
+  errno = 0;
+
+  printf("all: %d\n", isatty(open("/all", O_RDONLY)));
+  printf("errno: %d\n", errno);
+  errno = 0;
+
+  printf("folder: %d\n", isatty(open("/folder", O_RDONLY)));
+  printf("errno: %d\n", errno);
+  errno = 0;
+
+  printf("file: %d\n", isatty(open("/file", O_RDONLY)));
+  printf("errno: %d\n", errno);
+  errno = 0;
+
+  return 0;
+}