self = <azure.cli.testsdk.base.ExecutionResult object at 0x7fcedae25f98>
cli_ctx = <azure.cli.core.mock.DummyCli object at 0x7fcedaf434a8>
command = 'container attach -g clitest.rg000001 -n clicontainer000002'
expect_failure = False

    def _in_process_execute(self, cli_ctx, command, expect_failure=False):
        from six import StringIO
        from vcr.errors import CannotOverwriteExistingCassetteException
    
        if command.startswith('az '):
            command = command[3:]
    
        stdout_buf = StringIO()
        logging_buf = StringIO()
        try:
            # issue: stderr cannot be redirect in this form, as a result some failure information
            # is lost when command fails.
            self.exit_code = cli_ctx.invoke(shlex.split(command), out_file=stdout_buf) or 0
            self.output = stdout_buf.getvalue()
            self.applog = logging_buf.getvalue()
    
        except CannotOverwriteExistingCassetteException as ex:
>           raise AssertionError(ex)
E           AssertionError: Can't overwrite existing cassette ('/home/vsts/work/1/s/src/azure-cli/azure/cli/command_modules/container/tests/latest/recordings/test_container_attach.yaml') in your current record mode ('once').
E           No match for the request (<Request (GET) https://management.azure.com/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/clitest.rg000001/providers/Microsoft.ContainerInstance/containerGroups/clicontainer000002?api-version=2021-07-01>) was found.
E           Found 5 similar requests with 0 different matcher(s) :
E           
E           1 - (<Request (GET) https://management.azure.com/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/clitest.rg000001/providers/Microsoft.ContainerInstance/containerGroups/clicontainer000002?api-version=2021-07-01>).
E           Matchers succeeded : ['method', 'scheme', 'host', 'port', 'path', '_custom_request_query_matcher']
E           Matchers failed :
E           
E           2 - (<Request (GET) https://management.azure.com/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/clitest.rg000001/providers/Microsoft.ContainerInstance/containerGroups/clicontainer000002?api-version=2021-07-01>).
E           Matchers succeeded : ['method', 'scheme', 'host', 'port', 'path', '_custom_request_query_matcher']
E           Matchers failed :
E           
E           3 - (<Request (GET) https://management.azure.com/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/clitest.rg000001/providers/Microsoft.ContainerInstance/containerGroups/clicontainer000002?api-version=2021-07-01>).
E           Matchers succeeded : ['method', 'scheme', 'host', 'port', 'path', '_custom_request_query_matcher']
E           Matchers failed :

=========================== short test summary info ============================
FAILED src/azure-cli/azure/cli/command_modules/container/tests/latest/test_container_commands.py::AzureContainerInstanceScenarioTest::test_container_attach