diff --git a/tapir/statistics/tests/fancy_graph/test_number_of_investing_members_view.py b/tapir/statistics/tests/fancy_graph/test_number_of_investing_members_view.py
new file mode 100644
index 000000000..60dc5f606
--- /dev/null
+++ b/tapir/statistics/tests/fancy_graph/test_number_of_investing_members_view.py
@@ -0,0 +1,45 @@
+import datetime
+
+from django.utils import timezone
+
+from tapir.coop.models import ShareOwnership
+from tapir.coop.tests.factories import ShareOwnerFactory
+from tapir.statistics.views.fancy_graph.number_of_investing_members_view import (
+    NumberOfInvestingMembersAtDateView,
+)
+from tapir.utils.tests_utils import (
+    TapirFactoryTestBase,
+    mock_timezone_now,
+)
+
+
+class TestNumberOfInvestingMembersView(TapirFactoryTestBase):
+    NOW = datetime.datetime(year=2023, month=4, day=1, hour=12)
+    REFERENCE_TIME = timezone.make_aware(
+        datetime.datetime(year=2022, month=6, day=15, hour=12)
+    )
+
+    def setUp(self) -> None:
+        super().setUp()
+        self.NOW = mock_timezone_now(self, self.NOW)
+
+    def test_calculateDatapoint_memberIsNotInvesting_notCounted(self):
+        ShareOwnerFactory.create(is_investing=False)
+
+        result = NumberOfInvestingMembersAtDateView().calculate_datapoint(
+            self.REFERENCE_TIME
+        )
+
+        self.assertEqual(0, result)
+
+    def test_calculateDatapoint_memberIsInvesting_counted(self):
+        ShareOwnerFactory.create(is_investing=True)
+        ShareOwnership.objects.update(
+            start_date=self.REFERENCE_TIME.date() - datetime.timedelta(days=1)
+        )
+
+        result = NumberOfInvestingMembersAtDateView().calculate_datapoint(
+            self.REFERENCE_TIME
+        )
+
+        self.assertEqual(1, result)