Step Runner - command arguments are not partially checked against mocked arguments

[richardgaunt]

Step runner checks for whether the mocked arguments from the step definition are equal rather than contain the command arguments.

The documentation says it should be checking for whether the command's arguments contain the mocked argument.

see step helper: https://github.com/drevops/bats-helpers/blob/main/src/steps.bash#L196

see docs: https://github.com/drevops/bats-helpers/blob/main/docs/step-runner.md?plain=1#L59

Should change step helper to assert_contains rather than assert_equal

[richardgaunt]

See #44 for PR fixing this.

It may have breaking changes if users are relying on equality of arguments rather than a partial match