diff --git a/tests/timeseries/test_ntrfc_integral_scales b/tests/timeseries/test_ntrfc_integral_scales
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git a/tests/timeseries/test_ntrfc_integral_scales.py b/tests/timeseries/test_ntrfc_integral_scales.py
new file mode 100644
index 0000000000000000000000000000000000000000..8a4a2ab84871e597c133cf645f64860ac786ea42
--- /dev/null
+++ b/tests/timeseries/test_ntrfc_integral_scales.py
@@ -0,0 +1,14 @@
+import numpy as np
+
+from ntrfc.timeseries.integral_scales import integralscales
+
+
+def test_integralscales():
+
+    time = np.linspace(0,100,100000)
+    freq = 1
+    signal = np.sin(time*freq)+1
+
+    ts,ls=integralscales(signal,time)
+    assert np.isclose(ts,1,rtol=4e-3),"time scale not computed accurately"
+    assert np.isclose(ls,1,rtol=4e-3), "length scale not computed accurately"