diff --git a/tests/test_reconcile.py b/tests/test_reconcile.py
new file mode 100644
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+++ b/tests/test_reconcile.py
@@ -0,0 +1,175 @@
+import datetime
+import decimal
+
+from conservancy_beancount.reconcile.prototype_amex_reconciler import match_statement_and_books2 as match_statement_and_books, remove_payee_junk, date_proximity
+
+S1 = {
+    'date': datetime.date(2022, 1, 1),
+    'amount': decimal.Decimal('10.00'),
+    'payee': 'Patreon         / Patreon   / 123456/ ST-A1B2C3D4G5H6       /',
+    'line': 222,
+}
+S2 = {
+    'date': datetime.date(2022, 1, 2),
+    'amount': decimal.Decimal('20.00'),
+    'payee': 'BT*LINODE           PHILADELPHIA        P',
+    'line': 333,
+}
+S3 = {
+    'date': datetime.date(2022, 1, 3),
+    'amount': decimal.Decimal('30.00'),
+    'payee': 'USPS PO 4067540039 0PORTLAND            OR',
+    'line': 444,
+}
+
+B1 = {
+    'date': datetime.date(2022, 1, 1),
+    'amount': decimal.Decimal('10.00'),
+    'payee': 'Patreon',
+    'entity': '',
+    'check_id': None,
+    'filename': '2022/imports.beancount',
+    'line': 777,
+    'bank_statement': "Financial/Bank-Statements/AMEX/2022-01-12_AMEX_statement.pdf"
+}
+B2 = {
+    'date': datetime.date(2022, 1, 2),
+    'amount': decimal.Decimal('20.00'),
+    'payee': 'Linode',
+    'entity': '',
+    'check_id': None,
+    'filename': '2022/main.beancount',
+    'line': 888,
+    'bank_statement': "Financial/Bank-Statements/AMEX/2022-01-12_AMEX_statement.pdf"
+}
+B3_next_day = {
+    'date': datetime.date(2022, 1, 4),
+    'amount': decimal.Decimal('30.00'),
+    'payee': 'USPS',
+    'entity': '',
+    'check_id': None,
+    'filename': '2022/main.beancount',
+    'line': 999,
+    'bank_statement': "Financial/Bank-Statements/AMEX/2022-01-12_AMEX_statement.pdf"
+}
+B3_next_week = {
+    'date': datetime.date(2022, 1, 10),
+    'amount': decimal.Decimal('30.00'),
+    'payee': 'USPS',
+    'entity': '',
+    'check_id': None,
+    'filename': '2022/main.beancount',
+    'line': 999,
+    'bank_statement': "Financial/Bank-Statements/AMEX/2022-01-12_AMEX_statement.pdf"
+}
+B3_mismatch_amount = {
+    'date': datetime.date(2022, 1, 3),
+    'amount': decimal.Decimal('31.00'),
+    'payee': 'USPS',
+    'entity': '',
+    'check_id': None,
+    'filename': '2022/main.beancount',
+    'line': 999,
+    'bank_statement': "Financial/Bank-Statements/AMEX/2022-01-12_AMEX_statement.pdf"
+}
+B3_payee_mismatch_1 = {
+    'date': datetime.date(2022, 1, 3),
+    'amount': decimal.Decimal('30.00'),
+    'payee': 'Credit X',
+    'entity': '',
+    'check_id': None,
+    'filename': '2022/main.beancount',
+    'line': 999,
+    'bank_statement': "Financial/Bank-Statements/AMEX/2022-01-12_AMEX_statement.pdf"
+}
+B3_payee_mismatch_2 = {
+    'date': datetime.date(2022, 1, 3),
+    'amount': decimal.Decimal('30.00'),
+    'payee': 'Credit Y',
+    'entity': '',
+    'check_id': None,
+    'filename': '2022/main.beancount',
+    'line': 999,
+    'bank_statement': "Financial/Bank-Statements/AMEX/2022-01-12_AMEX_statement.pdf"
+}
+
+
+def test_one_exact_match():
+    statement = [S1]
+    books = [B1]
+    assert match_statement_and_books(statement, books) == [
+        ([S1], [B1], []),
+    ]
+
+def test_multiple_exact_matches():
+    statement = [S1, S2]
+    books = [B1, B2]
+    assert match_statement_and_books(statement, books) == [
+        ([S1], [B1], []),
+        ([S2], [B2], []),
+    ]
+
+def test_one_mismatch():
+    statement = [S1]
+    books = []
+    assert match_statement_and_books(statement, books) == [
+        ([S1], [], ['no match']),
+    ]
+
+def test_multiple_mismatches():
+    statement = [S1]
+    books = [B2]
+    assert match_statement_and_books(statement, books) == [
+        ([S1], [], ['no match']),
+        ([], [B2], ['no match']),
+    ]
+
+def test_next_day_matches():
+    statement = [S3]
+    books = [B3_next_day]
+    assert match_statement_and_books(statement, books) == [
+        ([S3], [B3_next_day], ['+/- 1 days']),
+    ]
+
+def test_next_week_matches():
+    statement = [S3]
+    books = [B3_next_week]
+    assert match_statement_and_books(statement, books) == [
+        ([S3], [B3_next_week], ['+/- 7 days']),
+    ]
+
+def test_incorrect_amount_does_not_match():
+    statement = [S3]
+    books = [B3_mismatch_amount]
+    assert match_statement_and_books(statement, books) == [
+        ([S3], [], ['no match']),
+        ([], [B3_mismatch_amount], ['no match']),
+    ]
+
+def test_payee_mismatch_ok_when_only_one_that_amount_and_date():
+    statement = [S3]
+    books = [B3_payee_mismatch_1]
+    assert match_statement_and_books(statement, books) == [
+        ([S3], [B3_payee_mismatch_1], ['payee mismatch', 'only one decent match']),
+    ]
+
+def test_payee_mismatch_not_ok_when_multiple_that_amount_and_date():
+    statement = [S3]
+    books = [B3_payee_mismatch_1, B3_payee_mismatch_2]
+    match = match_statement_and_books(statement, books)
+    assert match == [
+        ([S3], [], ['no match']),
+        ([], [B3_payee_mismatch_1], ['no match']),
+        ([], [B3_payee_mismatch_2], ['no match']),
+    ]
+
+# def test_subset_sum_with_same_date_and_payee():
+
+def test_remove_payee_junk():
+    assert remove_payee_junk('WIDGETSRUS INC PAYMENT 1') == 'WIDGETSRUS'
+    assert remove_payee_junk('0000010017') == '10017'
+
+def test_date_proximity():
+    assert date_proximity(datetime.date(2021, 8, 23), datetime.date(2021, 8, 23)) == 1.0
+    assert date_proximity(datetime.date(2021, 8, 23), datetime.date(2021, 8, 23) - datetime.timedelta(days=30)) == 0.5
+    assert date_proximity(datetime.date(2021, 8, 23), datetime.date(2021, 8, 23) - datetime.timedelta(days=60)) == 0.0