"""
Test if the environment.yml is empty or it constains other data structure than a dictionary
"""
import os
import sys
import pytest
from repo2docker import buildpacks


def test_empty_env_yml(tmpdir):
    tmpdir.chdir()
    p = tmpdir.join("environment.yml")
    p.write("")
    bp = buildpacks.CondaBuildPack()
    py_ver = bp.python_version
    # If the environment.yml is empty python_version will get an empty string
    assert py_ver == ""


def test_no_dict_env_yml(tmpdir):
    tmpdir.chdir()
    q = tmpdir.join("environment.yml")
    q.write("numpy\n " "matplotlib\n")
    bq = buildpacks.CondaBuildPack()
    with pytest.raises(TypeError):
        py_ver = bq.python_version