fill out coverage

Signed-off-by: William Woodruff <william@trailofbits.com>

src/rfc8785/__init__.py

@@ -4,11 +4,12 @@
 
 __version__ = "0.0.1"
 
-from ._impl import CanonicalizationError, IntegerDomainError, dump, dumps
+from ._impl import CanonicalizationError, FloatDomainError, IntegerDomainError, dump, dumps
 
 __all__ = [
     "CanonicalizationError",
     "IntegerDomainError",
+    "FloatDomainError",
     "dump",
     "dumps",
 ]

test/test_impl.py

@@ -72,3 +72,26 @@ def test_es6_float_stringification_full(es6_test_file):
 
             actual = sink.getvalue().decode()
             assert actual == expected
+
+
+def test_integer_domain():
+    impl.dumps(impl._INT_MAX)
+    with pytest.raises(impl.IntegerDomainError):
+        impl.dumps(impl._INT_MAX + 1)
+
+    impl.dumps(impl._INT_MIN)
+    with pytest.raises(impl.IntegerDomainError):
+        impl.dumps(impl._INT_MIN - 1)
+
+
+def test_string_invalid_utf8():
+    # escaped surrogate is fine
+    impl.dumps("\\udead")
+    with pytest.raises(impl.CanonicalizationError):
+        impl.dumps("\udead")
+
+
+def test_dumps_invalid_type():
+    with pytest.raises(impl.CanonicalizationError):
+        # set is not serializable
+        impl.dumps({1, 2, 3})

test/test_init.py

@@ -24,3 +24,11 @@ def test_roundtrip(vector, name):
 
     actual_deserialized = json.loads(actual_output)
     assert actual_deserialized == py_input
+
+
+def test_exception_hierarchy():
+    assert issubclass(rfc8785.CanonicalizationError, ValueError)
+    assert issubclass(rfc8785.IntegerDomainError, rfc8785.CanonicalizationError)
+    assert issubclass(rfc8785.FloatDomainError, rfc8785.CanonicalizationError)
+    assert not issubclass(rfc8785.IntegerDomainError, rfc8785.FloatDomainError)
+    assert not issubclass(rfc8785.FloatDomainError, rfc8785.IntegerDomainError)