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import subprocess
from scripts.test import shared
from . import utils
class ReduceTest(utils.BinaryenTestCase):
def test_warn_on_no_passes(self):
# run a reducer command that does nothing, and so ignores the input
open('do_nothing.py', 'w').close()
cmd = shared.WASM_REDUCE + [self.input_path('empty.wasm'), '-w', 'w.wasm', '-t', 't.wasm', '--command=python do_nothing.py']
err = shared.run_process(cmd, check=False, stderr=subprocess.PIPE).stderr
self.assertIn('Fatal: running the command on the given input gives the same result as when running it on either a trivial valid wasm or a file with nonsense in it. does the script not look at the test file (t.wasm)? (use -f to ignore this check)', err)
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