diff --git a/tests/test_condition.py b/tests/test_condition.py
index f59f73c..14b6829 100644
--- a/tests/test_condition.py
+++ b/tests/test_condition.py
@@ -72,3 +72,106 @@ def test_from_uri_with_unsupported_type(uri):
     condition_type = parse_qs(urlparse(uri.rstrip()).query)['fpt'][0]
     assert exc_info.value.args == (
         'Type {} is not supported'.format(condition_type),)
+
+
+@given(regex(r'^ni:\/\/\/sha-265;([a-zA-Z0-9_-]{0,86})\?(.+)$'))
+def test_from_uri_malformed_uri(uri):
+    from cryptoconditions.condition import Condition
+    from cryptoconditions.exceptions import ParsingError
+
+    # Note that the uri will contain `sha-265` instead of `sha-256`
+    with raises(ParsingError):
+        Condition.from_uri(uri)
+
+
+def test_from_uri_invalid_arguments(minimal_ed25519):
+    from cryptoconditions.condition import Condition
+
+    # raises a TypeError if the serialized_condition is not a str
+    with raises(TypeError):
+        Condition.from_uri(1)
+
+    # Note: This should be removed in future versions of the code
+    # from uri will return the the condition instance if we pass it a
+    # condition instance
+    condition = Condition.from_uri(minimal_ed25519.condition_uri)
+    assert Condition.from_uri(condition) == condition
+
+
+def test_condition_comparison(minimal_ed25519, minimal_prefix):
+    from cryptoconditions.condition import Condition
+
+    assert Condition.from_uri(minimal_ed25519.condition_uri) == \
+        Condition.from_uri(minimal_ed25519.condition_uri)
+
+    assert not Condition.from_uri(minimal_ed25519.condition_uri) == \
+        Condition.from_uri(minimal_prefix.condition_uri)
+
+
+def test_condition_hash():
+    from cryptoconditions.condition import Condition
+    condition = Condition()
+
+    # raises an exception if hash is not 32 bytes long
+    with raises(Exception):
+        condition.hash = 'a'
+
+    # raises a ValueError if the hash is not set
+    with raises(ValueError):
+        condition.hash
+
+    # correctly set the hash
+    condition.hash = 'a' * 32
+    assert condition.hash == 'a' * 32
+
+
+def test_condition_cost():
+    from cryptoconditions.condition import Condition
+    condition = Condition()
+
+    # raises a ValueError if the cost is not an int
+    condition.cost = 'a'
+    with raises(ValueError):
+        condition.cost
+
+
+def test_condition_validate():
+    from cryptoconditions.condition import Condition
+
+    # lets set a known type_id so that the TypeRegistry can return the correct
+    # condition type
+    condition = Condition()
+    condition.type_id = 0
+
+    # subtypes can have at most 32 bits or else raise a value error
+    condition.subtypes = range(Condition.MAX_SAFE_SUBTYPES + 1)
+    with raises(ValueError):
+        condition.validate()
+
+    # raises a ValueError if there is unsuported subtype
+    condition.subtypes = set(['magic'])
+    with raises(ValueError):
+        condition.validate()
+
+    # raises a ValueError if the cost if higher than MAX_COST
+    condition.subtypes = set()
+    condition.cost = Condition.MAX_COST + 1
+    with raises(ValueError):
+        condition.validate()
+
+
+def test_condition_to_asn1_json(basic_threshold):
+    from cryptoconditions.condition import Condition
+    from cryptoconditions.type_registry import TypeRegistry
+
+    condition = Condition.from_uri(basic_threshold.condition_uri)
+    condition_type = TypeRegistry.find_by_type_id(condition.type_id)
+
+    assert condition.to_asn1_json() == {
+        'type': condition_type['asn1_condition'],
+        'value': {
+            'cost': basic_threshold.cost,
+            'fingerprint': condition.hash,
+            'subtypes': '01011'
+        }
+    }