test function for fast_compute_cve

Author: yucongalicechen

src/diffpy/labpdfproc/tests/test_fast_cve.py

@@ -0,0 +1,11 @@
+import numpy as np
+
+from diffpy.labpdfproc.fast_cve import FAST_TTH_GRID, INVERSE_CVE_DATA, fast_compute_cve
+
+
+def test_fast_compute_cve():
+    expected_tth_grid = FAST_TTH_GRID
+    expected_cve = 1 / np.array(INVERSE_CVE_DATA)
+    actual_tth_grid, actual_cve = fast_compute_cve(mud=1)
+    assert np.allclose(actual_tth_grid, expected_tth_grid)
+    assert np.allclose(actual_cve, expected_cve, rtol=1e-5)