diff --git a/Makefile b/Makefile
index 0625cf50..ac3c64a8 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ test: coveragetests linttest doctest ansibletest
 
 .PHONY: unittests
 unittests:
-	coverage run ./manage.py test --shuffle $(tests)
+	coverage run ./manage.py test $(tests) --shuffle
 
 .PHONY: coveragetests
 coveragetests: unittests
diff --git a/publicdb/status_display/templatetags/fix_data.py b/publicdb/status_display/templatetags/fix_data.py
index 0cdfce62..800c0596 100644
--- a/publicdb/status_display/templatetags/fix_data.py
+++ b/publicdb/status_display/templatetags/fix_data.py
@@ -42,7 +42,7 @@ def fix_timestamps_in_data(values):
 
     x, y = list(zip(*values))
     seconds_in_day = [timestamp % 86400 for timestamp in x]
-    hours_in_day = [seconds // 3600.0 for seconds in seconds_in_day]
+    hours_in_day = [seconds / 3600.0 for seconds in seconds_in_day]
     values = [list(u) for u in zip(hours_in_day, y)]
 
     return values
diff --git a/tests/test_status_display/test_templatetags/__init__.py b/tests/test_status_display/test_templatetags/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/test_status_display/test_templatetags/test_fix_data.py b/tests/test_status_display/test_templatetags/test_fix_data.py
new file mode 100644
index 00000000..5f0d106a
--- /dev/null
+++ b/tests/test_status_display/test_templatetags/test_fix_data.py
@@ -0,0 +1,49 @@
+from django.test import TestCase
+
+from publicdb.status_display.templatetags import fix_data
+
+
+class TestFixData(TestCase):
+    def test_fix_histogram_data(self):
+        self.assertEqual([[1, 2.1], [2, 2.2], [3, 2.2]], fix_data.fix_histogram_data([[1, 2.1], [2, 2.2]]))
+        self.assertEqual([[1, 2.1], [10, 2.2], [19, 2.2]], fix_data.fix_histogram_data([[1, 2.1], [10, 2.2]]))
+
+    def test_fix_timestamps(self):
+        self.assertEqual([[1_000, 2.1], [2_000, 2.2]], fix_data.fix_timestamps([[1, 2.1], [2, 2.2]]))
+
+    def test_fix_timestamps_in_data(self):
+        dataset = [
+            [1647993600, 98],
+            [1647993780, 99],
+            [1648079820, 1],
+        ]
+        self.assertEqual(
+            [[0, 98], [0.05, 99], [23.95, 1]],
+            fix_data.fix_timestamps_in_data(dataset),
+        )
+
+    def test_slice_data(self):
+        result = fix_data.slice_data([1] * 2_000, 200)
+        self.assertEqual(10, len(result))
+        self.assertEqual([1] * 10, result)
+
+    def test_round_data(self):
+        self.assertEqual([[1, 2]], fix_data.round_data([[1, 2.11]], 0))
+        self.assertEqual([[1, 2.1]], fix_data.round_data([[1, 2.11]], 1))
+        self.assertEqual([[2.0, 2.2]], fix_data.round_data([[1.99, 2.16]], 1))
+
+    def test_shift_bins(self):
+        self.assertEqual([[2, 2.1], [3, 2.2]], fix_data.shift_bins([[1, 2.1], [2, 2.2]], 1))
+
+    def test_none_to_nan(self):
+        self.assertEqual('nan', fix_data.none_to_nan(None))
+
+        for value in [0., 0, 1, '', 'this']:
+            self.assertEqual(value, fix_data.none_to_nan(value))
+
+    def test_mv_to_adc(self):
+        self.assertEqual(30, fix_data.mv_to_adc(30))
+        self.assertEqual(30, fix_data.mv_to_adc(30.))
+        self.assertEqual(30.7, fix_data.mv_to_adc(30.7))
+        self.assertEqual(323, fix_data.mv_to_adc(-70))
+        self.assertEqual(253, fix_data.mv_to_adc(-30))
diff --git a/tests/test_status_display/test_templatetags/test_fix_strings.py b/tests/test_status_display/test_templatetags/test_fix_strings.py
new file mode 100644
index 00000000..624d58d4
--- /dev/null
+++ b/tests/test_status_display/test_templatetags/test_fix_strings.py
@@ -0,0 +1,12 @@
+from django.test import TestCase
+
+from publicdb.status_display.templatetags import fix_strings
+
+
+class TestFixStrings(TestCase):
+    def test_remove_hyphens(self):
+        self.assertEqual('', fix_strings.remove_hyphens(''))
+        self.assertEqual('', fix_strings.remove_hyphens('-'))
+        self.assertEqual('', fix_strings.remove_hyphens('--'))
+        self.assertEqual('WithoutHyphens', fix_strings.remove_hyphens('-Without-Hyphens'))
+