diff --git a/tests/test_meta_entity.py b/tests/test_meta_entity.py
new file mode 100644
index 0000000000000000000000000000000000000000..c0902d29bf5f0919ac300aae33ce982bd7181198
--- /dev/null
+++ b/tests/test_meta_entity.py
@@ -0,0 +1,103 @@
+"""Test validation of entity metadata"""
+# Copyright © 2020  Brett Smith
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import pytest
+
+from . import testutil
+
+from conservancy_beancount.plugin import meta_entity
+
+VALID_VALUES = {
+    'Smith-Alex',
+    'Company19',
+    'boyd-danah',
+    'B-van-der-A',
+}
+
+INVALID_VALUES = {
+    '-foo',
+    'foo-',
+    '-',
+    'Überentity',
+    'Alex Smith',
+    ' ',
+    '',
+}
+
+TEST_KEY = 'entity'
+
+@pytest.fixture(scope='module')
+def hook():
+    config = testutil.TestConfig()
+    return meta_entity.MetaEntity(config)
+
+@pytest.mark.parametrize('src_value', VALID_VALUES)
+def test_valid_values_on_postings(hook, src_value):
+    txn = testutil.Transaction(postings=[
+        ('Assets:Cash', -25),
+        ('Expenses:General', 25, {TEST_KEY: src_value}),
+    ])
+    assert not any(hook.run(txn))
+
+@pytest.mark.parametrize('src_value', INVALID_VALUES)
+def test_invalid_values_on_postings(hook, src_value):
+    txn = testutil.Transaction(postings=[
+        ('Assets:Cash', -25),
+        ('Expenses:General', 25, {TEST_KEY: src_value}),
+    ])
+    errors = list(hook.run(txn))
+    assert len(errors) == 1
+    assert errors[0].message == "Expenses:General entity malformed: {}".format(src_value)
+
+@pytest.mark.parametrize('src_value', VALID_VALUES)
+def test_valid_values_on_transactions(hook, src_value):
+    txn = testutil.Transaction(**{TEST_KEY: src_value}, postings=[
+        ('Assets:Cash', -25),
+        ('Expenses:General', 25),
+    ])
+    assert not any(hook.run(txn))
+
+@pytest.mark.parametrize('src_value', INVALID_VALUES)
+def test_invalid_values_on_transactions(hook, src_value):
+    txn = testutil.Transaction(**{TEST_KEY: src_value}, postings=[
+        ('Assets:Cash', -25),
+        ('Expenses:General', 25),
+    ])
+    errors = list(hook.run(txn))
+    assert 1 <= len(errors) <= 2
+    assert all(error.message == "transaction entity malformed: {}".format(src_value)
+               for error in hook.run(txn))
+
+@pytest.mark.parametrize('account,required', [
+    ('Accrued:AccountsReceivable', True),
+    ('Assets:Cash', False),
+    ('Expenses:General', True),
+    ('Income:Donations', True),
+    ('Liabilities:CreditCard', False),
+    ('UnearnedIncome:Donations', True),
+])
+def test_which_accounts_required_on(hook, account, required):
+    txn = testutil.Transaction(postings=[
+        ('Assets:Checking', 25),
+        (account, 25),
+    ])
+    errors = list(hook.run(txn))
+    if not required:
+        assert not errors
+    else:
+        assert errors
+        assert any(error.message == "{} missing entity".format(account)
+                   for error in errors)