Test for logistic fit and minor fix to fit func

testing_project/logistic.py

@@ -11,3 +11,4 @@ def iterate_f(x, r, n_iterations):
         trajectory[i+1] = f(x, r)
         x = trajectory[i+1]
     return trajectory
+

testing_project/logistic_fit.py

@@ -24,7 +24,7 @@ def fit_r(xs):
     it = len(xs) - 1
 
     def error(r):
-        return np.linalg.norm(xs - iterate_f(it, x0, r))
+        return np.linalg.norm(xs - iterate_f(x0, r, it))
 
     errors = []
     for r in np.linspace(0, 4, 4001):

testing_project/test_logistic_fit.py

@@ -0,0 +1,11 @@
+from numpy.testing import assert_allclose
+
+from logistic import iterate_f
+from logistic_fit import fit_r
+
+def test_fit_r():
+    r = 3.421
+    trajectory = iterate_f(0.3, r, 23)
+    fit_result_r = fit_r(trajectory)
+    assert_allclose(r, fit_result_r)
+