33 lines
790 B
Python
33 lines
790 B
Python
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import fol
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def test_empty_subst():
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root = fol.parse('Happy(x)').subst({})
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assert 'PRED[Happy](VAR[x])' == str(root)
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def test_one_var_subst():
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root = fol.parse('Happy(x)').subst({'x': fol.term('z')})
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assert 'PRED[Happy](VAR[z])' == str(root)
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def test_one_function_subst():
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root = fol.parse('Happy(x)').subst({'x': fol.term('f(z)')})
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assert 'PRED[Happy](FUN[f](VAR[z]))' == str(root)
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def test_ambiguous_subst():
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root = fol.parse('Happy(x)').subst({
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'x': fol.term('y'),
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'y': fol.term('z'),
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})
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assert 'PRED[Happy](VAR[y])' == str(root)
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def test_ambiguous_reverse_subst():
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root = fol.parse('Happy(x, y)').subst({
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'y': fol.term('z'),
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'x': fol.term('y'),
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})
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assert 'PRED[Happy](VAR[y],VAR[z])' == str(root)
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