How to use pyfile_with_warnings method in Pytest

Best Python code snippet using pytest

test_warnings.py

Source:test_warnings.py Github

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...3import sys4import pytest5WARNINGS_SUMMARY_HEADER = "warnings summary"6@pytest.fixture7def pyfile_with_warnings(testdir, request):8 """9 Create a test file which calls a function in a module which generates warnings.10 """11 testdir.syspathinsert()12 test_name = request.function.__name__13 module_name = test_name.lstrip("test_") + "_module"14 testdir.makepyfile(15 **{16 module_name: """17 import warnings18 def foo():19 warnings.warn(UserWarning("user warning"))20 warnings.warn(RuntimeWarning("runtime warning"))21 return 1...

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According to the Python 2.7.5 grammar specification, which is read by the parser generator and used to parse Python source files, a function looks like this:

funcdef: 'def' NAME parameters ':' suite

The function body is a suite which looks like this

suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT

Following this all the way through the grammar, stmt can be an expr_stmt, which can be just a testlist, which can be just a single test which can (eventually) be just an atom, which can be just a single STRING. The docstring.

Here are just the appropriate parts of the grammar, in the right order to follow through:

stmt: simple_stmt | compound_stmt
simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE
small_stmt: (expr_stmt | print_stmt  | del_stmt | pass_stmt | flow_stmt |
             import_stmt | global_stmt | exec_stmt | assert_stmt)
expr_stmt: testlist (augassign (yield_expr|testlist) |
                     ('=' (yield_expr|testlist))*)
testlist: test (',' test)* [',']
test: or_test ['if' or_test 'else' test] | lambdef
or_test: and_test ('or' and_test)*
and_test: not_test ('and' not_test)*
not_test: 'not' not_test | comparison
comparison: expr (comp_op expr)*
comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'
expr: xor_expr ('|' xor_expr)*
xor_expr: and_expr ('^' and_expr)*
and_expr: shift_expr ('&' shift_expr)*
shift_expr: arith_expr (('<<'|'>>') arith_expr)*
arith_expr: term (('+'|'-') term)*
term: factor (('*'|'/'|'%'|'//') factor)*
factor: ('+'|'-'|'~') factor | power
power: atom trailer* ['**' factor]
atom: ('(' [yield_expr|testlist_comp] ')' |
       '[' [listmaker] ']' |
       '{' [dictorsetmaker] '}' |
       '`' testlist1 '`' |
       NAME | NUMBER | STRING+)
https://stackoverflow.com/questions/17735170/why-does-python-allow-an-empty-function-with-doc-string-body-without-a-pass

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