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OP seems to have solved the issue already. I add some info in case this helps future readers since I was just stuck with this error for a few hours.

Test Fixture Nodes ['talker', 'listener']

The listed names are the nodes' name, the ones that are specified in .launch or in .test file as name. Note as it states fixture, these nodes are not necessarily the ones testcases are defined in; these can be the ones to setup the environment for the tests.

(In my case because the node name was used in other places in my package multiple times, which is apprently a bad habit though, and because I didn't pay attention to this error message that clearly stated as "fixture", it was difficult to boil down the root cause.)

I thought I'd improve rostest code, but after taking a look at it, I concluded that actually the error message succintly provides sufficient info so I wound't suggest any change.

OP seems to have solved the issue already. I add some info in case this helps future readers since I was just stuck with this error for a few hours.

Test Fixture Nodes ['talker', 'listener']

The listed names are the nodes' name, the ones that are specified in .launch or in .test file as name. Note as it states fixture, these nodes are not necessarily the ones testcases are defined in; these can be the ones to setup the environment for the tests.

(In my case because the node name was used in other places in my package multiple times, which is apprently a bad habit though, and because I didn't pay attention to this error message that clearly stated as "fixture", it was difficult to boil down the root cause.)

I thought I'd improve rostest code, but after taking a look at it, I concluded that actually the error message succintly provides sufficient enough info so I wound't didn't suggest any change.

OP seems to have solved the issue already. I add some info in case this helps future readers since I was just stuck with this error for a few hours.

Test Fixture Nodes ['talker', 'listener']

The listed names are the nodes' name, the ones that are specified in .launch or in .test file as name. Note as it states fixture, these nodes are not necessarily the ones testcases are defined in; these can be the ones to setup the environment for the tests.

(In my case because the node name was used in other places in my package multiple times, which is apprently a bad habit though, and because I didn't pay attention to this error message that clearly stated as "fixture", it was difficult to boil down the root cause.)

I thought I'd improve rostest code, but after taking a look at it, I concluded that actually the error message succintly provides enough info so I didn't decided not to suggest any change.