test: run test in separate process in case of error

If there is an error when executing the method under test, then this
test caused the downstream test \remoteapicore_test::test_getBacklinks
to une

test: run test in separate process in case of error

If there is an error when executing the method under test, then this
test caused the downstream test \remoteapicore_test::test_getBacklinks
to unexpectedly fail. Probably, because the global plugin controller
would not have been reset to its original value.

Running this test in its own process ensures that it won't affect any
other test, even if it messes with the global state and doesn't clean up.

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test: fix two tests on PHP8

On PHP8 trying to access a non-existing array key leads to a warning,
which we might treat as errors?

This incidentally also fixes another test downstream which broke be

test: fix two tests on PHP8

On PHP8 trying to access a non-existing array key leads to a warning,
which we might treat as errors?

This incidentally also fixes another test downstream which broke because
this rendering test changes the global plugin controller, but doesn't
clean it up that if the test errors.

-9000 is used as the position to make it obvious that this number is
meaningless for this test.

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style: fix test code style

This makes all the basic phpcs style fixes and adds visibility to the
class methods.

remove '&' reference operator from metadata test, not required in php5

fix E_STRICT errors FS#2427

This commit fixes all E_STRICT messages shown when running the test
suite. There might be more problems not covered by tests, yet.

For compatibility reasons with plugins

fix E_STRICT errors FS#2427

This commit fixes all E_STRICT messages shown when running the test
suite. There might be more problems not covered by tests, yet.

For compatibility reasons with plugins, E_STRICT errors are still
supressed.

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removed unecessary requiresin unit tests

moved _testing to _test