**SUMMARY**

Test names must be unique per scope otherwise the second test overrides the first one with the same name.

**ISSUE TYPE**
- Bugfix Pull Request

**COMPONENT NAME**
ansible/test/units/parsing/test_mod_args.py
ansible/test/units/module_utils/facts/test_collectors.py
ansible/test/units/module_utils/common/validation/test_check_required_if.py
ansible/test/units/module_utils/basic/test_deprecate_warn.py

**ADDITIONAL INFORMATION**

For example if you had a test file that does:

```
def test_a():
    pass

def test_a():
    pass
```

Then only the second `test_a` will be ran. More details [here](https://codereview.doctor/features/python/best-practice/avoid-duplicate-unit-test-names).

These are the tests that are overriding previously defined tests due to this problem:

https://github.com/ansible/ansible/blob/de9a3bda2cfaace7e3d25b0c4774eefdd9514687/test/units/parsing/test_mod_args.py#L121
https://github.com/ansible/ansible/blob/de9a3bda2cfaace7e3d25b0c4774eefdd9514687/test/units/module_utils/facts/test_collectors.py#L397
https://github.com/ansible/ansible/blob/de9a3bda2cfaace7e3d25b0c4774eefdd9514687/test/units/module_utils/facts/test_collectors.py#L413
https://github.com/ansible/ansible/blob/de9a3bda2cfaace7e3d25b0c4774eefdd9514687/test/units/module_utils/common/validation/test_check_required_if.py#L56
https://github.com/ansible/ansible/blob/de9a3bda2cfaace7e3d25b0c4774eefdd9514687/test/units/module_utils/basic/test_deprecate_warn.py#L74

I found this issue automatically, see other issues [here](https://codereview.doctor/ansible/ansible)



example = r'BOOT_IMAGE=/boot/vmlinuz-4.4.0-72-generic root=UUID=e12e46d9-06c9-4a64-a7b3-60e24b062d90 ro console=tty1 console=ttyS0'
        
        expected = {'BOOT_IMAGE': '/boot/vmlinuz-4.4.0-72-generic',
                    'root': 'UUID=e12e46d9-06c9-4a64-a7b3-60e24b062d90',
                    'ro': True,
                    'console': 'ttyS0'}
        fact_collector = self.collector_class()
        facts_dict = fact_collector._parse_proc_cmdline(example)
        
        self.assertDictEqual(facts_dict, expected)
class TestDistributionFacts(BaseFactsTest):
    __test__ = True
    gather_subset = ['!all', 'distribution']
    valid_subsets = ['distribution']
    fact_namespace = 'ansible_distribution'
    collector_class = DistributionFactCollector
class TestDnsFacts(BaseFactsTest):
    __test__ = True
    gather_subset = ['!all', 'dns']
    valid_subsets = ['dns']
    fact_namespace = 'ansible_dns'
    collector_class = DnsFactCollector
class TestEnvFacts(BaseFactsTest):