Add two tests to ensure millisecond precision is used in timestamps irrespective of user-provided precision

stix2/test/v21/test_attack_pattern.py

@@ -5,8 +5,6 @@ import pytz
 
 import stix2
 
-from .constants import ATTACK_PATTERN_ID
-
 EXPECTED = """{
     "type": "attack-pattern",
     "spec_version": "2.1",
@@ -65,7 +63,7 @@ def test_parse_attack_pattern(data):
 
     assert ap.type == 'attack-pattern'
     assert ap.spec_version == '2.1'
-    assert ap.id == ATTACK_PATTERN_ID
+    assert ap.id == "attack-pattern--0c7b5b88-8ff7-4a4d-aa9d-feb398cd0061"
     assert ap.created == dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
     assert ap.modified == dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
     assert ap.description == "..."
@@ -84,4 +82,37 @@ def test_attack_pattern_invalid_labels():
             labels=1,
         )
 
+
+def test_overly_precise_timestamps():
+    ap = stix2.v21.AttackPattern(
+        id="attack-pattern--0c7b5b88-8ff7-4a4d-aa9d-feb398cd0061",
+        created="2016-05-12T08:17:27.0000342Z",
+        modified="2016-05-12T08:17:27.000287Z",
+        name="Spear Phishing",
+        external_references=[{
+            "source_name": "capec",
+            "external_id": "CAPEC-163",
+        }],
+        description="...",
+    )
+
+    assert str(ap) == EXPECTED
+
+
+def test_less_precise_timestamps():
+    ap = stix2.v21.AttackPattern(
+        id="attack-pattern--0c7b5b88-8ff7-4a4d-aa9d-feb398cd0061",
+        created="2016-05-12T08:17:27.00Z",
+        modified="2016-05-12T08:17:27.0Z",
+        name="Spear Phishing",
+        external_references=[{
+            "source_name": "capec",
+            "external_id": "CAPEC-163",
+        }],
+        description="...",
+    )
+
+    assert str(ap) == EXPECTED
+
+
 # TODO: Add other examples