# copypaste all of this into the docker shell, good idea to include this line too
python3 - <<'EOF'
import os
top='/w/'  # the folder we'll be testin in
fn1='t.tf.1'     # test-filename 1
fn2='t.tf.2'     # test-filename 2
ap1=top+fn1      # full path to file 1
ap2=top+fn2      # full path to file 2

# first make sure we delete any old remnants from previous tests
print('a')
for f in [ap1,ap2]:
 if os.path.exists(f):
  os.unlink(f)

# ok this is what we're starting from
print('b')
files=os.listdir(top)
assert(fn1 not in files)
assert(fn2 not in files)

# create a file and then make sure it appears immediately
print('c')
with open(ap1,'wb') as f: f.close()
files=os.listdir(top)
assert(fn1 in files)

# ok now rename it and make sure it immediately takes effect visibly
print('d')
os.rename(ap1,ap2)
files=os.listdir(top)
assert(fn1 not in files)
assert(fn2 in files)

# now delete it, then immediately create another file with the same name
print('e')
os.unlink(ap2)
with open(ap2,'wb') as f: f.close()
files=os.listdir(top)
assert(fn2 in files)

# and finally just delete it
print('f')
os.unlink(ap2)
files=os.listdir(top)
assert(fn1 not in files)
assert(fn2 not in files)

print('\n\ntest finished, no issues, all good')
EOF
echo $?