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-rw-r--r--tests/runner.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/runner.py b/tests/runner.py
index d3d5beb8..b49edf38 100644
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -184,6 +184,7 @@ class RunnerCore(unittest.TestCase):
# Detect compilation crashes and errors
if compiler_output is not None and 'Traceback' in compiler_output and 'in test_' in compiler_output: print compiler_output; assert 0
+ assert os.path.exists(filename + '.o.js'), 'Emscripten failed to generate .js: ' + str(compiler_output)
if output_processor is not None:
output_processor(open(filename + '.o.js').read())