def test_add_del_instruction(self, dfparser):
        df_content = """\
CMD xyz
LABEL a=b c=d
LABEL x=\"y z\"
ENV h i
ENV j='k' l=m
"""
        dfparser.content = df_content

        dfparser._add_instruction('FROM', 'fedora')
        assert dfparser.baseimage == 'fedora'
        dfparser._delete_instructions('FROM')
        assert dfparser.baseimage is None

        dfparser._add_instruction('FROM', 'fedora')
        assert dfparser.baseimage == 'fedora'
        dfparser._delete_instructions('FROM', 'fedora')
        assert dfparser.baseimage is None

        dfparser._add_instruction('LABEL', ('Name', 'self'))
        assert len(dfparser.labels) == 4
        assert dfparser.labels.get('Name') == 'self'
        dfparser._delete_instructions('LABEL')
        assert dfparser.labels == {}

        dfparser._add_instruction('ENV', ('Name', 'self'))
        assert len(dfparser.envs) == 4
        assert dfparser.envs.get('Name') == 'self'
        dfparser._delete_instructions('ENV')
        assert dfparser.envs == {}

        assert dfparser.cmd == 'xyz'
    def test_add_del_instruction(self, dfparser):
        df_content = """\
CMD xyz
LABEL a=b c=d
LABEL x=\"y z\"
ENV h i
ENV j='k' l=m
"""
        dfparser.content = df_content

        dfparser._add_instruction('FROM', 'fedora')
        assert dfparser.baseimage == 'fedora'
        dfparser._delete_instructions('FROM')
        assert dfparser.baseimage is None

        dfparser._add_instruction('FROM', 'fedora')
        assert dfparser.baseimage == 'fedora'
        dfparser._delete_instructions('FROM', 'fedora')
        assert dfparser.baseimage is None

        dfparser._add_instruction('LABEL', ('Name', 'self'))
        assert len(dfparser.labels) == 4
        assert dfparser.labels.get('Name') == 'self'
        dfparser._delete_instructions('LABEL')
        assert dfparser.labels == {}

        dfparser._add_instruction('ENV', ('Name', 'self'))
        assert len(dfparser.envs) == 4
        assert dfparser.envs.get('Name') == 'self'
        dfparser._delete_instructions('ENV')
        assert dfparser.envs == {}

        assert dfparser.cmd == 'xyz'