cti-python-stix2/stix2/test/test_relationship.py

import datetime as dt

import pytest
import pytz

import stix2

from .constants import FAKE_TIME, INDICATOR_ID, MALWARE_ID, RELATIONSHIP_ID
from .constants import RELATIONSHIP_KWARGS


EXPECTED_RELATIONSHIP = """{
    "created": "2016-04-06T20:06:37Z",
    "id": "relationship--00000000-1111-2222-3333-444444444444",
    "modified": "2016-04-06T20:06:37Z",
    "relationship_type": "indicates",
    "source_ref": "indicator--01234567-89ab-cdef-0123-456789abcdef",
    "target_ref": "malware--fedcba98-7654-3210-fedc-ba9876543210",
    "type": "relationship"
}"""


def test_relationship_all_required_fields():
    now = dt.datetime(2016, 4, 6, 20, 6, 37, tzinfo=pytz.utc)

    rel = stix2.Relationship(
        type='relationship',
        id=RELATIONSHIP_ID,
        created=now,
        modified=now,
        relationship_type='indicates',
        source_ref=INDICATOR_ID,
        target_ref=MALWARE_ID,
    )
    assert str(rel) == EXPECTED_RELATIONSHIP


def test_relationship_autogenerated_fields(relationship):
    assert relationship.type == 'relationship'
    assert relationship.id == 'relationship--00000000-0000-0000-0000-000000000001'
    assert relationship.created == FAKE_TIME
    assert relationship.modified == FAKE_TIME
    assert relationship.relationship_type == 'indicates'
    assert relationship.source_ref == INDICATOR_ID
    assert relationship.target_ref == MALWARE_ID

    assert relationship['type'] == 'relationship'
    assert relationship['id'] == 'relationship--00000000-0000-0000-0000-000000000001'
    assert relationship['created'] == FAKE_TIME
    assert relationship['modified'] == FAKE_TIME
    assert relationship['relationship_type'] == 'indicates'
    assert relationship['source_ref'] == INDICATOR_ID
    assert relationship['target_ref'] == MALWARE_ID


def test_relationship_type_must_be_relationship():
    with pytest.raises(stix2.exceptions.InvalidValueError) as excinfo:
        stix2.Relationship(type='xxx', **RELATIONSHIP_KWARGS)

    assert excinfo.value.cls == stix2.Relationship
    assert excinfo.value.prop_name == "type"
    assert excinfo.value.reason == "must equal 'relationship'."
    assert str(excinfo.value) == "Invalid value for Relationship 'type': must equal 'relationship'."


def test_relationship_id_must_start_with_relationship():
    with pytest.raises(stix2.exceptions.InvalidValueError) as excinfo:
        stix2.Relationship(id='my-prefix--', **RELATIONSHIP_KWARGS)

    assert excinfo.value.cls == stix2.Relationship
    assert excinfo.value.prop_name == "id"
    assert excinfo.value.reason == "must start with 'relationship--'."
    assert str(excinfo.value) == "Invalid value for Relationship 'id': must start with 'relationship--'."


def test_relationship_required_field_relationship_type():
    with pytest.raises(stix2.exceptions.MissingFieldsError) as excinfo:
        stix2.Relationship()
    assert str(excinfo.value) == "Missing required field(s) for Relationship: (relationship_type, source_ref, target_ref)."


def test_relationship_missing_some_required_fields():
    with pytest.raises(stix2.exceptions.MissingFieldsError) as excinfo:
        stix2.Relationship(relationship_type='indicates')
    assert str(excinfo.value) == "Missing required field(s) for Relationship: (source_ref, target_ref)."


def test_relationship_required_field_target_ref():
    with pytest.raises(stix2.exceptions.MissingFieldsError) as excinfo:
        stix2.Relationship(
            relationship_type='indicates',
            source_ref=INDICATOR_ID
        )

    assert excinfo.value.cls == stix2.Relationship
    assert excinfo.value.fields == ["target_ref"]
    assert str(excinfo.value) == "Missing required field(s) for Relationship: (target_ref)."


def test_cannot_assign_to_relationship_attributes(relationship):
    with pytest.raises(ValueError) as excinfo:
        relationship.relationship_type = "derived-from"

    assert str(excinfo.value) == "Cannot modify properties after creation."


def test_invalid_kwarg_to_relationship():
    with pytest.raises(TypeError) as excinfo:
        stix2.Relationship(my_custom_property="foo", **RELATIONSHIP_KWARGS)
    assert str(excinfo.value) == "unexpected keyword arguments: ['my_custom_property']" in str(excinfo)


def test_create_relationship_from_objects_rather_than_ids(indicator, malware):
    rel = stix2.Relationship(
        relationship_type="indicates",
        source_ref=indicator,
        target_ref=malware,
    )

    assert rel.relationship_type == 'indicates'
    assert rel.source_ref == 'indicator--00000000-0000-0000-0000-000000000001'
    assert rel.target_ref == 'malware--00000000-0000-0000-0000-000000000002'
    assert rel.id == 'relationship--00000000-0000-0000-0000-000000000003'


def test_create_relationship_with_positional_args(indicator, malware):
    rel = stix2.Relationship(indicator, 'indicates', malware)

    assert rel.relationship_type == 'indicates'
    assert rel.source_ref == 'indicator--00000000-0000-0000-0000-000000000001'
    assert rel.target_ref == 'malware--00000000-0000-0000-0000-000000000002'
    assert rel.id == 'relationship--00000000-0000-0000-0000-000000000003'