add test for logistic fit

testing_project/test_logistic_fit.py

@@ -0,0 +1,9 @@
+from numpy.testing import assert_allclose
+import pytest
+from logistic_fit import fit_r
+from logistic import iterate_f
+
+def test_logistic_fit(x0=0.3, r=3.421, it=23):
+    xs = iterate_f(it, x0, r)
+    r_fitted = fit_r(xs)
+    assert_allclose(r, r_fitted)