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| 1 | +# -*- coding: utf-8 -*- |
| 2 | +import py |
| 3 | +import pytest |
| 4 | + |
| 5 | + |
| 6 | +def test_help_message(testdir): |
| 7 | + result = testdir.runpytest( |
| 8 | + '--help', |
| 9 | + ) |
| 10 | + result.stdout.fnmatch_lines([ |
| 11 | + 'random-order:', |
| 12 | + # '*--random-order-seed=RANDOM_ORDER_SEED*', |
| 13 | + '*--random-order-mode={global,package,module}*', |
| 14 | + ]) |
| 15 | + |
| 16 | + |
| 17 | +def get_runtest_call_sequence(result, key=None): |
| 18 | + """ |
| 19 | + Returns a tuple of names of test methods that were run |
| 20 | + in the order they were run. |
| 21 | + """ |
| 22 | + calls = [] |
| 23 | + |
| 24 | + for c in result.reprec.getcalls('pytest_runtest_call'): |
| 25 | + calls.append((c.item.module.__package__, c.item.module.__name__, c.item.name)) |
| 26 | + return tuple(calls) |
| 27 | + |
| 28 | + |
| 29 | +@pytest.fixture |
| 30 | +def tmp_tree_of_tests(testdir): |
| 31 | + """ |
| 32 | + Creates a directory structure: |
| 33 | + tmpdir/ |
| 34 | + shallow_tests/ |
| 35 | + test_a.py |
| 36 | + deep_tests/ |
| 37 | + test_b.py |
| 38 | + test_c.py |
| 39 | +
|
| 40 | + If module name doesn't start with "test_", it isn't picked up by runpytest. |
| 41 | + """ |
| 42 | + |
| 43 | + sup = testdir.mkpydir('shallow_tests') |
| 44 | + |
| 45 | + sup.join('test_a.py').write(py.code.Source(""" |
| 46 | + def test_a1(): |
| 47 | + assert False |
| 48 | + def test_a2(): |
| 49 | + assert True |
| 50 | + def test_a3(): |
| 51 | + assert True |
| 52 | + """)) |
| 53 | + |
| 54 | + sup.join('test_ax.py').write(py.code.Source(""" |
| 55 | + def test_ax1(): |
| 56 | + assert True |
| 57 | + def test_ax2(): |
| 58 | + assert True |
| 59 | + def test_ax3(): |
| 60 | + assert True |
| 61 | + """)) |
| 62 | + |
| 63 | + sub = testdir.mkpydir('shallow_tests/deep_tests') |
| 64 | + |
| 65 | + sub.join('test_b.py').write(py.code.Source(""" |
| 66 | + def test_b1(): |
| 67 | + assert True |
| 68 | + def test_b2(): |
| 69 | + assert False |
| 70 | + def test_b3(): |
| 71 | + assert True |
| 72 | + """)) |
| 73 | + |
| 74 | + sub.join('test_c.py').write(py.code.Source(""" |
| 75 | + def test_c1(): |
| 76 | + assert True |
| 77 | + """)) |
| 78 | + |
| 79 | + sub.join('test_d.py').write(py.code.Source(""" |
| 80 | + def test_d1(): |
| 81 | + assert True |
| 82 | + def test_d2(): |
| 83 | + assert True |
| 84 | + """)) |
| 85 | + |
| 86 | + return testdir |
| 87 | + |
| 88 | + |
| 89 | +def check_call_sequence(seq, shuffle_mode='module'): |
| 90 | + packages_seen = [] |
| 91 | + modules_seen = [] |
| 92 | + |
| 93 | + num_package_switches = 0 |
| 94 | + num_module_switches = 0 |
| 95 | + |
| 96 | + for package, module, item in seq: |
| 97 | + if not packages_seen: |
| 98 | + num_package_switches += 1 |
| 99 | + packages_seen.append(package) |
| 100 | + elif packages_seen[-1] == package: |
| 101 | + # Same package as the previous item |
| 102 | + pass |
| 103 | + else: |
| 104 | + num_package_switches += 1 |
| 105 | + if package not in packages_seen: |
| 106 | + packages_seen.append(package) |
| 107 | + |
| 108 | + if not modules_seen: |
| 109 | + num_module_switches += 1 |
| 110 | + modules_seen.append(module) |
| 111 | + elif modules_seen[-1] == module: |
| 112 | + # Same module as the previous item |
| 113 | + pass |
| 114 | + else: |
| 115 | + num_module_switches += 1 |
| 116 | + if module not in modules_seen: |
| 117 | + modules_seen.append(module) |
| 118 | + |
| 119 | + if shuffle_mode == 'global': |
| 120 | + if len(packages_seen) >= num_package_switches: |
| 121 | + pytest.fail( |
| 122 | + 'Too few package switches ({}) for ' |
| 123 | + 'random-shuffle-mode=global. Packages seen: {}'.format( |
| 124 | + num_package_switches, |
| 125 | + packages_seen, |
| 126 | + ) |
| 127 | + ) |
| 128 | + |
| 129 | + if shuffle_mode == 'package': |
| 130 | + if len(packages_seen) != num_package_switches: |
| 131 | + pytest.fail('There were more package switches than number of packages') |
| 132 | + |
| 133 | + if len(modules_seen) >= num_module_switches: |
| 134 | + pytest.fail( |
| 135 | + 'Suspiciously few module switches ({}) for ' |
| 136 | + 'random-shuffle-mode=package. Modules seen: {}'.format( |
| 137 | + num_module_switches, |
| 138 | + modules_seen, |
| 139 | + ) |
| 140 | + ) |
| 141 | + |
| 142 | + elif shuffle_mode == 'module' and len(modules_seen) != num_module_switches: |
| 143 | + pytest.fail('There were more module switches than number of modules') |
| 144 | + |
| 145 | + |
| 146 | +@pytest.mark.parametrize('mode', ['module', 'package', 'global']) |
| 147 | +def test_it_works(tmp_tree_of_tests, mode): |
| 148 | + sequences = set() |
| 149 | + |
| 150 | + for x in xrange(5): |
| 151 | + result = tmp_tree_of_tests.runpytest('--random-order-mode={}'.format(mode), '--verbose') |
| 152 | + result.assert_outcomes(passed=10, failed=2) |
| 153 | + seq = get_runtest_call_sequence(result) |
| 154 | + check_call_sequence(seq, shuffle_mode=mode) |
| 155 | + assert len(seq) == 12 |
| 156 | + sequences.add(seq) |
| 157 | + |
| 158 | + assert 1 < len(sequences) <= 5 |
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