diff --git a/tests/test_books_loader.py b/tests/test_books_loader.py
index 6f9b1a554945955e3367352f30d12b4989429eb2..c79c7fb71d7dfe8ebaea91a7414ac87c28e8d638 100644
--- a/tests/test_books_loader.py
+++ b/tests/test_books_loader.py
@@ -67,7 +67,9 @@ def txn_years(entries):
 def test_load_fy_range(conservancy_loader, from_fy, to_fy, expect_years):
     entries, errors, options_map = conservancy_loader.load_fy_range(from_fy, to_fy)
     assert not errors
-    assert txn_years(entries).issuperset(expect_years)
+    actual_years = txn_years(entries)
+    assert actual_years.issuperset(expect_years)
+    assert min(actual_years) == expect_years.start
 
 def test_load_fy_range_does_not_duplicate_openings(conservancy_loader):
     entries, errors, options_map = conservancy_loader.load_fy_range(2010, 2030)
@@ -85,7 +87,9 @@ def test_load_all(conservancy_loader, from_year):
     from_year = from_year or 2018
     assert not errors
     check_openings(entries)
-    assert txn_years(entries).issuperset(range(from_year or 2018, 2021))
+    actual_years = txn_years(entries)
+    assert actual_years.issuperset(range(from_year, 2021))
+    assert min(actual_years) == from_year
 
 @pytest.mark.parametrize('from_date', [
     date(2019, 2, 1),
@@ -100,4 +104,6 @@ def test_load_all_from_date(conservancy_loader, from_date):
     entries, errors, options_map = conservancy_loader.load_all(from_date)
     assert not errors
     check_openings(entries)
-    assert txn_years(entries).issuperset(range(from_year, 2021))
+    actual_years = txn_years(entries)
+    assert actual_years.issuperset(range(from_year, 2021))
+    assert min(actual_years) == from_year