diff --git a/stix2/confidence/scales.py b/stix2/confidence/scales.py
index 6d8882d..4880f33 100644
--- a/stix2/confidence/scales.py
+++ b/stix2/confidence/scales.py
@@ -228,7 +228,7 @@ def admiralty_credibility_to_value(scale_value):
 
     """
     if scale_value == "6 - Truth cannot be judged":
-        pass  # TODO: Ask what happens here!
+        raise ValueError("STIX Confidence value cannot be determined for %s" % scale_value)  # TODO: What happens here?
     elif scale_value == "5 - Improbable":
         return 10
     elif scale_value == "4 - Doubtful":
@@ -270,7 +270,7 @@ def value_to_admiralty_credibility(confidence_value):
         ValueError: If `confidence_value` is out of bounds.
 
     """
-    # TODO: Ask what happens with "6 - Truth cannot be judged" !
+    # TODO: Case "6 - Truth cannot be judged"
     if 19 >= confidence_value >= 0:
         return "5 - Improbable"
     elif 39 >= confidence_value >= 20:
diff --git a/stix2/test/constants.py b/stix2/test/constants.py
index 839b547..7ced397 100644
--- a/stix2/test/constants.py
+++ b/stix2/test/constants.py
@@ -10,9 +10,12 @@ COURSE_OF_ACTION_ID = "course-of-action--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f"
 IDENTITY_ID = "identity--311b2d2d-f010-5473-83ec-1edf84858f4c"
 INDICATOR_ID = "indicator--01234567-89ab-cdef-0123-456789abcdef"
 INTRUSION_SET_ID = "intrusion-set--4e78f46f-a023-4e5f-bc24-71b3ca22ec29"
+LOCATION_ID = "location--a6e9345f-5a15-4c29-8bb3-7dcc5d168d64"
 MALWARE_ID = "malware--fedcba98-7654-3210-fedc-ba9876543210"
 MARKING_DEFINITION_ID = "marking-definition--613f2e26-407d-48c7-9eca-b8e91df99dc9"
+NOTE_ID = "note--0c7b5b88-8ff7-4a4d-aa9d-feb398cd0061"
 OBSERVED_DATA_ID = "observed-data--b67d30ff-02ac-498a-92f9-32f845f448cf"
+OPINION_ID = "opinion--b01efc25-77b4-4003-b18b-f6e24b5cd9f7"
 REPORT_ID = "report--84e4d88f-44ea-4bcd-bbf3-b2c1c320bcb3"
 RELATIONSHIP_ID = "relationship--00000000-1111-2222-3333-444444444444"
 THREAT_ACTOR_ID = "threat-actor--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f"
diff --git a/stix2/test/test_confidence.py b/stix2/test/test_confidence.py
new file mode 100644
index 0000000..b4146a5
--- /dev/null
+++ b/stix2/test/test_confidence.py
@@ -0,0 +1,288 @@
+import pytest
+
+from stix2.confidence.scales import (admiralty_credibility_to_value,
+                                     dni_to_value, none_low_med_high_to_value,
+                                     value_to_admiralty_credibility,
+                                     value_to_dni,
+                                     value_to_none_low_medium_high,
+                                     value_to_wep, value_to_zero_ten,
+                                     wep_to_value, zero_ten_to_value)
+
+CONFIDENCE_ERROR_STR = "STIX Confidence value cannot be determined for %s"
+RANGE_ERROR_STR = "Range of values out of bounds: %s"
+
+
+def _between(x, val, y):
+    return x >= val >= y
+
+
+def test_confidence_range_none_low_med_high():
+    confidence_range = range(-1, 101)
+
+    for val in confidence_range:
+        if val < 0 or val > 100:
+            with pytest.raises(ValueError) as excinfo:
+                value_to_none_low_medium_high(val)
+
+            assert str(excinfo.value) == RANGE_ERROR_STR % val
+            continue
+
+        if val == 0:
+            assert value_to_none_low_medium_high(val) == "None"
+        elif _between(29, val, 1):
+            assert value_to_none_low_medium_high(val) == "Low"
+        elif _between(69, val, 30):
+            assert value_to_none_low_medium_high(val) == "Med"
+        elif _between(100, val, 70):
+            assert value_to_none_low_medium_high(val) == "High"
+        else:
+            pytest.fail("Unexpected behavior %s" % val)
+
+
+@pytest.mark.parametrize("scale_value,result", [
+    ("None", 0),
+    ("Low", 15),
+    ("Med", 50),
+    ("High", 85)
+])
+def test_confidence_scale_valid_none_low_med_high(scale_value, result):
+    val = none_low_med_high_to_value(scale_value)
+    assert val == result
+
+
+@pytest.mark.parametrize("scale_value", [
+    "Super",
+    "none",
+    ""
+])
+def test_confidence_scale_invalid_none_low_med_high(scale_value):
+    with pytest.raises(ValueError) as excinfo:
+        none_low_med_high_to_value(scale_value)
+
+    assert str(excinfo.value) == CONFIDENCE_ERROR_STR % scale_value
+
+
+def test_confidence_range_zero_ten():
+    confidence_range = range(-1, 101)
+
+    for val in confidence_range:
+        if val < 0 or val > 100:
+            with pytest.raises(ValueError) as excinfo:
+                value_to_zero_ten(val)
+
+            assert str(excinfo.value) == RANGE_ERROR_STR % val
+            continue
+
+        if _between(4, val, 0):
+            assert value_to_zero_ten(val) == "0"
+        elif _between(14, val, 5):
+            assert value_to_zero_ten(val) == "1"
+        elif _between(24, val, 15):
+            assert value_to_zero_ten(val) == "2"
+        elif _between(34, val, 25):
+            assert value_to_zero_ten(val) == "3"
+        elif _between(44, val, 35):
+            assert value_to_zero_ten(val) == "4"
+        elif _between(54, val, 45):
+            assert value_to_zero_ten(val) == "5"
+        elif _between(64, val, 55):
+            assert value_to_zero_ten(val) == "6"
+        elif _between(74, val, 65):
+            assert value_to_zero_ten(val) == "7"
+        elif _between(84, val, 75):
+            assert value_to_zero_ten(val) == "8"
+        elif _between(94, val, 85):
+            assert value_to_zero_ten(val) == "9"
+        elif _between(100, val, 95):
+            assert value_to_zero_ten(val) == "10"
+        else:
+            pytest.fail("Unexpected behavior %s" % val)
+
+
+@pytest.mark.parametrize("scale_value,result", [
+    ("0", 0),
+    ("1", 10),
+    ("2", 20),
+    ("3", 30),
+    ("4", 40),
+    ("5", 50),
+    ("6", 60),
+    ("7", 70),
+    ("8", 80),
+    ("9", 90),
+    ("10", 100)
+])
+def test_confidence_scale_valid_zero_ten(scale_value, result):
+    val = zero_ten_to_value(scale_value)
+    assert val == result
+
+
+@pytest.mark.parametrize("scale_value", [
+    "11",
+    8,
+    ""
+])
+def test_confidence_scale_invalid_zero_ten(scale_value):
+    with pytest.raises(ValueError) as excinfo:
+        zero_ten_to_value(scale_value)
+
+    assert str(excinfo.value) == CONFIDENCE_ERROR_STR % scale_value
+
+
+def test_confidence_range_admiralty_credibility():
+    confidence_range = range(-1, 101)
+
+    for val in confidence_range:
+        if val < 0 or val > 100:
+            with pytest.raises(ValueError) as excinfo:
+                value_to_admiralty_credibility(val)
+
+            assert str(excinfo.value) == RANGE_ERROR_STR % val
+            continue
+
+        if _between(19, val, 0):
+            assert value_to_admiralty_credibility(val) == "5 - Improbable"
+        elif _between(39, val, 20):
+            assert value_to_admiralty_credibility(val) == "4 - Doubtful"
+        elif _between(59, val, 40):
+            assert value_to_admiralty_credibility(val) == "3 - Possibly True"
+        elif _between(79, val, 60):
+            assert value_to_admiralty_credibility(val) == "2 - Probably True"
+        elif _between(100, val, 80):
+            assert value_to_admiralty_credibility(val) == "1 - Confirmed by other sources"
+        else:
+            pytest.fail("Unexpected behavior %s" % val)
+
+
+@pytest.mark.parametrize("scale_value,result", [
+    ("5 - Improbable", 10),
+    ("4 - Doubtful", 30),
+    ("3 - Possibly True", 50),
+    ("2 - Probably True", 70),
+    ("1 - Confirmed by other sources", 90)
+])
+def test_confidence_scale_valid_admiralty_credibility(scale_value, result):
+    val = admiralty_credibility_to_value(scale_value)
+    assert val == result
+
+
+@pytest.mark.parametrize("scale_value", [
+    "5 - improbable",
+    "6 - Truth cannot be judged",
+    ""
+])
+def test_confidence_scale_invalid_admiralty_credibility(scale_value):
+    with pytest.raises(ValueError) as excinfo:
+        admiralty_credibility_to_value(scale_value)
+
+    assert str(excinfo.value) == CONFIDENCE_ERROR_STR % scale_value
+
+
+def test_confidence_range_wep():
+    confidence_range = range(-1, 101)
+
+    for val in confidence_range:
+        if val < 0 or val > 100:
+            with pytest.raises(ValueError) as excinfo:
+                value_to_wep(val)
+
+            assert str(excinfo.value) == RANGE_ERROR_STR % val
+            continue
+
+        if val == 0:
+            assert value_to_wep(val) == "Impossible"
+        elif _between(19, val, 1):
+            assert value_to_wep(val) == "Highly Unlikely/Almost Certainly Not"
+        elif _between(39, val, 20):
+            assert value_to_wep(val) == "Unlikely/Probably Not"
+        elif _between(59, val, 40):
+            assert value_to_wep(val) == "Even Chance"
+        elif _between(79, val, 60):
+            assert value_to_wep(val) == "Likely/Probable"
+        elif _between(99, val, 80):
+            assert value_to_wep(val) == "Highly likely/Almost Certain"
+        elif val == 100:
+            assert value_to_wep(val) == "Certain"
+        else:
+            pytest.fail("Unexpected behavior %s" % val)
+
+
+@pytest.mark.parametrize("scale_value,result", [
+    ("Impossible", 0),
+    ("Highly Unlikely/Almost Certainly Not", 10),
+    ("Unlikely/Probably Not", 30),
+    ("Even Chance", 50),
+    ("Likely/Probable", 70),
+    ("Highly likely/Almost Certain", 90),
+    ("Certain", 100)
+])
+def test_confidence_scale_valid_wep(scale_value, result):
+    val = wep_to_value(scale_value)
+    assert val == result
+
+
+@pytest.mark.parametrize("scale_value", [
+    "Unlikely / Probably Not",
+    "Almost certain",
+    ""
+])
+def test_confidence_scale_invalid_wep(scale_value):
+    with pytest.raises(ValueError) as excinfo:
+        wep_to_value(scale_value)
+
+    assert str(excinfo.value) == CONFIDENCE_ERROR_STR % scale_value
+
+
+def test_confidence_range_dni():
+    confidence_range = range(-1, 101)
+
+    for val in confidence_range:
+        if val < 0 or val > 100:
+            with pytest.raises(ValueError) as excinfo:
+                value_to_dni(val)
+
+            assert str(excinfo.value) == RANGE_ERROR_STR % val
+            continue
+
+        if _between(9, val, 0):
+            assert value_to_dni(val) == "Almost No Chance / Remote"
+        elif _between(19, val, 10):
+            assert value_to_dni(val) == "Very Unlikely / Highly Improbable"
+        elif _between(39, val, 20):
+            assert value_to_dni(val) == "Unlikely / Improbable"
+        elif _between(59, val, 40):
+            assert value_to_dni(val) == "Roughly Even Change / Roughly Even Odds"
+        elif _between(79, val, 60):
+            assert value_to_dni(val) == "Likely / Probable"
+        elif _between(89, val, 80):
+            assert value_to_dni(val) == "Very Likely / Highly Probable"
+        elif _between(100, val, 90):
+            assert value_to_dni(val) == "Almost Certain / Nearly Certain"
+        else:
+            pytest.fail("Unexpected behavior %s" % val)
+
+
+@pytest.mark.parametrize("scale_value,result", [
+    ("Almost No Chance / Remote", 5),
+    ("Very Unlikely / Highly Improbable", 15),
+    ("Unlikely / Improbable", 30),
+    ("Roughly Even Change / Roughly Even Odds", 50),
+    ("Likely / Probable", 70),
+    ("Very Likely / Highly Probable", 85),
+    ("Almost Certain / Nearly Certain", 95)
+])
+def test_confidence_scale_valid_dni(scale_value, result):
+    val = dni_to_value(scale_value)
+    assert val == result
+
+
+@pytest.mark.parametrize("scale_value", [
+    "Almost Certain/Nearly Certain",
+    "Almost Certain / nearly Certain",
+    ""
+])
+def test_confidence_scale_invalid_none_dni(scale_value):
+    with pytest.raises(ValueError) as excinfo:
+        dni_to_value(scale_value)
+
+    assert str(excinfo.value) == CONFIDENCE_ERROR_STR % scale_value
diff --git a/stix2/test/test_language_content.py b/stix2/test/test_language_content.py
new file mode 100644
index 0000000..2343d69
--- /dev/null
+++ b/stix2/test/test_language_content.py
@@ -0,0 +1,68 @@
+import datetime as dt
+
+import pytest
+import pytz
+
+import stix2
+
+CAMPAIGN_ID = "campaign--12a111f0-b824-4baf-a224-83b80237a094"
+
+LANGUAGE_CONTENT_ID = "language-content--b86bd89f-98bb-4fa9-8cb2-9ad421da981d"
+
+TEST_CAMPAIGN = """{
+    "type": "campaign",
+    "id": "campaign--12a111f0-b824-4baf-a224-83b80237a094",
+    "lang": "en",
+    "created": "2017-02-08T21:31:22.007Z",
+    "modified": "2017-02-08T21:31:22.007Z",
+    "name": "Bank Attack",
+    "description": "More information about bank attack"
+}"""
+
+TEST_LANGUAGE_CONTENT = """{
+    "type": "language-content",
+    "id": "language-content--b86bd89f-98bb-4fa9-8cb2-9ad421da981d",
+    "created": "2017-02-08T21:31:22.007Z",
+    "modified": "2017-02-08T21:31:22.007Z",
+    "object_ref": "campaign--12a111f0-b824-4baf-a224-83b80237a094",
+    "object_modified": "2017-02-08T21:31:22.007Z",
+    "contents": {
+        "de": {
+            "name": "Bank Angriff 1",
+            "description": "Weitere Informationen über Banküberfall"
+        },
+        "fr": {
+            "name": "Attaque Bank 1",
+            "description": "Plus d'informations sur la crise bancaire"
+        }
+    }
+}"""
+
+
+@pytest.mark.xfail(reason="Dictionary keys are too short")
+def test_language_content_campaign():
+    now = dt.datetime(2017, 2, 8, 21, 31, 22, microsecond=7000, tzinfo=pytz.utc)
+
+    lc = stix2.LanguageContent(
+        type='language-content',
+        id=LANGUAGE_CONTENT_ID,
+        created=now,
+        modified=now,
+        object_ref=CAMPAIGN_ID,
+        object_modified=now,
+        contents={
+            "de": {
+                "name": "Bank Angriff 1",
+                "description": "Weitere Informationen über Banküberfall"
+            },
+            "fr": {
+                "name": "Attaque Bank 1",
+                "description": "Plus d'informations sur la crise bancaire"
+            }
+        }
+    )
+
+    camp = stix2.parse(TEST_CAMPAIGN)
+
+    assert str(lc) in TEST_LANGUAGE_CONTENT
+    assert lc.modified == camp.modified
diff --git a/stix2/test/test_location.py b/stix2/test/test_location.py
index e69de29..8ce44d7 100644
--- a/stix2/test/test_location.py
+++ b/stix2/test/test_location.py
@@ -0,0 +1,82 @@
+import datetime as dt
+import re
+
+import pytest
+import pytz
+
+import stix2
+
+from .constants import LOCATION_ID
+
+
+EXPECTED_LOCATION_1 = """{
+    "type": "location",
+    "id": "location--a6e9345f-5a15-4c29-8bb3-7dcc5d168d64",
+    "created": "2016-04-06T20:03:00.000Z",
+    "modified": "2016-04-06T20:03:00.000Z",
+    "latitude": 48.8566,
+    "longitude": 2.3522
+}"""
+
+EXPECTED_LOCATION_1_REPR = "Location(" + " ".join("""
+    type='location',
+    id='location--a6e9345f-5a15-4c29-8bb3-7dcc5d168d64',
+    created='2016-04-06T20:03:00.000Z',
+    modified='2016-04-06T20:03:00.000Z',
+    latitude=48.8566,
+    longitude=2.3522""".split()) + ")"
+
+EXPECTED_LOCATION_2 = """{
+    "type": "location",
+    "id": "location--a6e9345f-5a15-4c29-8bb3-7dcc5d168d64",
+    "created": "2016-04-06T20:03:00.000Z",
+    "modified": "2016-04-06T20:03:00.000Z",
+    "region": "north-america"
+}
+"""
+
+EXPECTED_LOCATION_2_REPR = "Location(" + " ".join("""
+    type='location',
+    id='location--a6e9345f-5a15-4c29-8bb3-7dcc5d168d64',
+    created='2016-04-06T20:03:00.000Z',
+    modified='2016-04-06T20:03:00.000Z',
+    region='north-america'""".split()) + ")"
+
+
+def test_location_with_some_required_properties():
+    now = dt.datetime(2016, 4, 6, 20, 3, 0, tzinfo=pytz.utc)
+
+    loc = stix2.Location(
+        type="location",
+        id=LOCATION_ID,
+        created=now,
+        modified=now,
+        latitude=48.8566,
+        longitude=2.3522
+    )
+
+    assert str(loc) == EXPECTED_LOCATION_1
+    rep = re.sub(r"(\[|=| )u('|\"|\\\'|\\\")", r"\g<1>\g<2>", repr(loc))
+    assert rep == EXPECTED_LOCATION_1_REPR
+
+
+@pytest.mark.parametrize("data", [
+    EXPECTED_LOCATION_2,
+    {
+        "type": "location",
+        "id": "location--a6e9345f-5a15-4c29-8bb3-7dcc5d168d64",
+        "created": "2016-04-06T20:03:00.000Z",
+        "modified": "2016-04-06T20:03:00.000Z",
+        "region": "north-america"
+    }
+])
+def test_parse_location(data):
+    location = stix2.parse(data)
+
+    assert location.type == 'location'
+    assert location.id == LOCATION_ID
+    assert location.created == dt.datetime(2016, 4, 6, 20, 3, 0, tzinfo=pytz.utc)
+    assert location.modified == dt.datetime(2016, 4, 6, 20, 3, 0, tzinfo=pytz.utc)
+    assert location.region == 'north-america'
+    rep = re.sub(r"(\[|=| )u('|\"|\\\'|\\\")", r"\g<1>\g<2>", repr(location))
+    assert rep == EXPECTED_LOCATION_2_REPR
diff --git a/stix2/test/test_note.py b/stix2/test/test_note.py
index e69de29..df117d8 100644
--- a/stix2/test/test_note.py
+++ b/stix2/test/test_note.py
@@ -0,0 +1,110 @@
+import datetime as dt
+import re
+
+import pytest
+import pytz
+
+import stix2
+
+from .constants import CAMPAIGN_ID, NOTE_ID
+
+DESCRIPTION = ('This note indicates the various steps taken by the threat'
+               ' analyst team to investigate this specific campaign. Step'
+               ' 1) Do a scan 2) Review scanned results for identified '
+               'hosts not known by external intel... etc')
+
+EXPECTED_NOTE = """{
+    "type": "note",
+    "id": "note--0c7b5b88-8ff7-4a4d-aa9d-feb398cd0061",
+    "created": "2016-05-12T08:17:27.000Z",
+    "modified": "2016-05-12T08:17:27.000Z",
+    "summary": "Tracking Team Note#1",
+    "description": "%s",
+    "authors": [
+        "John Doe"
+    ],
+    "object_refs": [
+        "campaign--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f"
+    ],
+    "external_references": [
+        {
+            "source_name": "job-tracker",
+            "external_id": "job-id-1234"
+        }
+    ]
+}""" % DESCRIPTION
+
+EXPECTED_OPINION_REPR = "Note(" + " ".join(("""
+    type='note',
+    id='note--0c7b5b88-8ff7-4a4d-aa9d-feb398cd0061',
+    created='2016-05-12T08:17:27.000Z',
+    modified='2016-05-12T08:17:27.000Z',
+    summary='Tracking Team Note#1',
+    description='%s',
+    authors=['John Doe'],
+    object_refs=['campaign--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f'],
+    external_references=[ExternalReference(source_name='job-tracker', external_id='job-id-1234')]
+""" % DESCRIPTION).split()) + ")"
+
+
+def test_note_with_required_properties():
+    now = dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
+
+    note = stix2.Note(
+        type='note',
+        id=NOTE_ID,
+        created=now,
+        modified=now,
+        summary='Tracking Team Note#1',
+        object_refs=[CAMPAIGN_ID],
+        authors=['John Doe'],
+        description=DESCRIPTION,
+        external_references=[
+            {
+                'source_name': 'job-tracker',
+                'external_id': 'job-id-1234'
+            }
+        ]
+    )
+
+    assert str(note) == EXPECTED_NOTE
+    rep = re.sub(r"(\[|=| )u('|\"|\\\'|\\\")", r"\g<1>\g<2>", repr(note))
+    assert rep == EXPECTED_OPINION_REPR
+
+
+@pytest.mark.parametrize("data", [
+    EXPECTED_NOTE,
+    {
+        "type": "note",
+        "id": "note--0c7b5b88-8ff7-4a4d-aa9d-feb398cd0061",
+        "created": "2016-05-12T08:17:27.000Z",
+        "modified": "2016-05-12T08:17:27.000Z",
+        "summary": "Tracking Team Note#1",
+        "description": DESCRIPTION,
+        "authors": [
+            "John Doe"
+        ],
+        "object_refs": [
+            "campaign--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f"
+        ],
+        "external_references": [
+            {
+                "source_name": "job-tracker",
+                "external_id": "job-id-1234"
+            }
+        ]
+    }
+])
+def test_parse_note(data):
+    note = stix2.parse(data)
+
+    assert note.type == 'note'
+    assert note.id == NOTE_ID
+    assert note.created == dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
+    assert note.modified == dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
+    assert note.object_refs[0] == CAMPAIGN_ID
+    assert note.authors[0] == 'John Doe'
+    assert note.summary == 'Tracking Team Note#1'
+    assert note.description == DESCRIPTION
+    rep = re.sub(r"(\[|=| )u('|\"|\\\'|\\\")", r"\g<1>\g<2>", repr(note))
+    assert rep == EXPECTED_OPINION_REPR
diff --git a/stix2/test/test_opinion.py b/stix2/test/test_opinion.py
index e69de29..7de415a 100644
--- a/stix2/test/test_opinion.py
+++ b/stix2/test/test_opinion.py
@@ -0,0 +1,82 @@
+import datetime as dt
+import re
+
+import pytest
+import pytz
+
+import stix2
+
+from .constants import OPINION_ID
+
+DESCRIPTION = ('This doesn\'t seem like it is feasible. We\'ve seen how '
+               'PandaCat has attacked Spanish infrastructure over the '
+               'last 3 years, so this change in targeting seems too great'
+               ' to be viable. The methods used are more commonly '
+               'associated with the FlameDragonCrew.')
+
+EXPECTED_OPINION = """{
+    "type": "opinion",
+    "id": "opinion--b01efc25-77b4-4003-b18b-f6e24b5cd9f7",
+    "created": "2016-05-12T08:17:27.000Z",
+    "modified": "2016-05-12T08:17:27.000Z",
+    "description": "%s",
+    "object_refs": [
+        "relationship--16d2358f-3b0d-4c88-b047-0da2f7ed4471"
+    ],
+    "opinion": "strongly-disagree"
+}""" % DESCRIPTION
+
+EXPECTED_OPINION_REPR = "Opinion(" + " ".join(("""
+    type='opinion',
+    id='opinion--b01efc25-77b4-4003-b18b-f6e24b5cd9f7',
+    created='2016-05-12T08:17:27.000Z',
+    modified='2016-05-12T08:17:27.000Z',
+    description="%s",
+    object_refs=['relationship--16d2358f-3b0d-4c88-b047-0da2f7ed4471'],
+    opinion='strongly-disagree'""" % DESCRIPTION).split()) + ")"
+
+
+def test_opinion_with_required_properties():
+    now = dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
+
+    opi = stix2.Opinion(
+        type='opinion',
+        id=OPINION_ID,
+        created=now,
+        modified=now,
+        object_refs=['relationship--16d2358f-3b0d-4c88-b047-0da2f7ed4471'],
+        opinion='strongly-disagree',
+        description=DESCRIPTION
+    )
+
+    assert str(opi) == EXPECTED_OPINION
+    rep = re.sub(r"(\[|=| )u('|\"|\\\'|\\\")", r"\g<1>\g<2>", repr(opi))
+    assert rep == EXPECTED_OPINION_REPR
+
+
+@pytest.mark.parametrize("data", [
+    EXPECTED_OPINION,
+    {
+        "type": "opinion",
+        "id": "opinion--b01efc25-77b4-4003-b18b-f6e24b5cd9f7",
+        "created": "2016-05-12T08:17:27.000Z",
+        "modified": "2016-05-12T08:17:27.000Z",
+        "description": DESCRIPTION,
+        "object_refs": [
+            "relationship--16d2358f-3b0d-4c88-b047-0da2f7ed4471"
+        ],
+        "opinion": "strongly-disagree"
+    }
+])
+def test_parse_opinion(data):
+    opinion = stix2.parse(data)
+
+    assert opinion.type == 'opinion'
+    assert opinion.id == OPINION_ID
+    assert opinion.created == dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
+    assert opinion.modified == dt.datetime(2016, 5, 12, 8, 17, 27, tzinfo=pytz.utc)
+    assert opinion.opinion == 'strongly-disagree'
+    assert opinion.object_refs[0] == 'relationship--16d2358f-3b0d-4c88-b047-0da2f7ed4471'
+    assert opinion.description == DESCRIPTION
+    rep = re.sub(r"(\[|=| )u('|\"|\\\'|\\\")", r"\g<1>\g<2>", repr(opinion))
+    assert rep == EXPECTED_OPINION_REPR