1 files changed, 32 insertions, 1 deletions
diff --git a/tests/unix/extra_coverage.py b/tests/unix/extra_coverage.py
index f2b40282b3..ef1b50fda0 100644
--- a/tests/unix/extra_coverage.py
+++ b/tests/unix/extra_coverage.py
@@ -5,15 +5,46 @@ except NameError:
     import sys
     sys.exit()
 
+import uerrno
+
 data = extra_coverage()
 
 # test hashing of str/bytes that have an invalid hash
-print(data)
+print(data[0], data[1])
 print(hash(data[0]))
 print(hash(data[1]))
 print(hash(bytes(data[0], 'utf8')))
 print(hash(str(data[1], 'utf8')))
 
+# test streams
+stream = data[2] # has set_error and set_buf. Write always returns error
+stream.set_error(uerrno.EAGAIN) # non-blocking error
+print(stream.read()) # read all encounters non-blocking error
+print(stream.read(1)) # read 1 byte encounters non-blocking error
+print(stream.readline()) # readline encounters non-blocking error
+print(stream.readinto(bytearray(10))) # readinto encounters non-blocking error
+print(stream.write(b'1')) # write encounters non-blocking error
+print(stream.write1(b'1')) # write1 encounters non-blocking error
+stream.set_buf(b'123')
+print(stream.read(4)) # read encounters non-blocking error after successful reads
+stream.set_buf(b'123')
+print(stream.read1(4)) # read1 encounters non-blocking error after successful reads
+stream.set_buf(b'123')
+print(stream.readline(4)) # readline encounters non-blocking error after successful reads
+try:
+    print(stream.ioctl(0, 0)) # ioctl encounters non-blocking error; raises OSError
+except OSError:
+    print('OSError')
+stream.set_error(0)
+print(stream.ioctl(0, bytearray(10))) # successful ioctl call
+
+stream2 = data[3] # is textio and sets .write = NULL
+try:
+    print(stream2.write(b'1')) # attempt to call NULL implementation
+except OSError:
+    print('OSError')
+print(stream2.read(1)) # read 1 byte encounters non-blocking error with textio stream
+
 # test basic import of frozen scripts
 import frzstr1
 import frzmpy1