Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/scipy/optimize/tests/test_nnls.py

@@ -0,0 +1,34 @@
+""" Unit tests for nonnegative least squares
+Author: Uwe Schmitt
+Sep 2008
+"""
+import numpy as np
+
+from numpy.testing import assert_
+from pytest import raises as assert_raises
+
+from scipy.optimize import nnls
+from numpy import arange, dot
+from numpy.linalg import norm
+
+
+class TestNNLS(object):
+
+    def test_nnls(self):
+        a = arange(25.0).reshape(-1,5)
+        x = arange(5.0)
+        y = dot(a,x)
+        x, res = nnls(a,y)
+        assert_(res < 1e-7)
+        assert_(norm(dot(a,x)-y) < 1e-7)
+
+    def test_maxiter(self):
+        # test that maxiter argument does stop iterations
+        # NB: did not manage to find a test case where the default value
+        # of maxiter is not sufficient, so use a too-small value
+        rndm = np.random.RandomState(1234)
+        a = rndm.uniform(size=(100, 100))
+        b = rndm.uniform(size=100)
+        with assert_raises(RuntimeError):
+            nnls(a, b, maxiter=1)
+