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tests/test_fft.py

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+import os.path
+import numpy as np
+from numpy.testing import assert_allclose
+import pytest
+
+from optifik.fft import thickness_from_fft
+from optifik.analysis import smooth_intensities
+from optifik.io import load_spectrum
+
+
+def test_FFT():
+    FOLDER = os.path.join('tests', 'basic')
+    FILE_NAME = '003582.xy'
+    expected = 3524.51
+
+    spectrum_path = os.path.join(FOLDER, FILE_NAME)
+    lambdas, raw_intensities = load_spectrum(spectrum_path, lambda_min=450)
+    smoothed_intensities = smooth_intensities(raw_intensities)
+    r_index =  1.324188 + 3102.060378 / (lambdas**2)
+
+    thickness_FFT = thickness_from_fft(lambdas,
+                                       smoothed_intensities,
+                                       refractive_index=r_index)
+    result = thickness_FFT.thickness
+
+    assert_allclose(result, expected, rtol=1e-1)
+
+