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Init vars escape issue

See original GitHub issue

When backend-config is passed to a subprocess with init_vars it is not properly escaped. Example

import tftest
import logging

logging.basicConfig(level=logging.DEBUG)


if __name__ == "__main__":
    tf = tftest.TerraformTest('.', None, "terraform")
    backend_config = {
        "bucket": "bucket_name",
        "key": "dummy.tfstate",
        "region": "us-east-1",
    }
    tf.setup(init_vars=backend_config, cleanup_on_exit=False)

Output

DEBUG:tftest:['init', ('-no-color', '-input=false', "-backend-config='bucket=bucket_name'", "-backend-config='key=dummy.tfstate'", "-backend-config='region=us-east-1'")]
CRITICAL:tftest:Error running command init: 1 Initializing modules...
Downloading git::ssh://...
...


Initializing the backend...

Error: Invalid backend configuration argument

The backend configuration argument "'bucket" given on the command line is not
expected for the selected backend type.


Error: Invalid backend configuration argument

The backend configuration argument "'key" given on the command line is not
expected for the selected backend type.


Error: Invalid backend configuration argument

The backend configuration argument "'region" given on the command line is not
expected for the selected backend type.


Traceback (most recent call last):
  File "pr.py", line 14, in <module>
    tf.setup(init_vars=backend_config, cleanup_on_exit=False)
  File "/Users/vtk/.virtualenvs/qa/lib/python3.7/site-packages/tftest.py", line 309, in setup
    return self.init(plugin_dir=plugin_dir, init_vars=init_vars, backend=backend)
  File "/Users/vtk/.virtualenvs/qa/lib/python3.7/site-packages/tftest.py", line 317, in init
    return self.execute_command('init', *cmd_args).out
  File "/Users/vtk/.virtualenvs/qa/lib/python3.7/site-packages/tftest.py", line 397, in execute_command
    raise TerraformTestError(message)
tftest.TerraformTestError: Error running command init: 1 Initializing modules...
Downloading git::ssh://...
...