TST: test fix of out-of-bound evaluations in optimize.minimize, powel…

…l method (#13411)

* TST: test fix of out-of-bound evaluations in optimize.minimize, powell method

scipy/optimize/tests/test_optimize.py

@@ -2028,6 +2028,15 @@ def fun(x):
 
     optimize.minimize(fun, x0=[0.6, 20], method='Powell', bounds=bounds)
 
+    # Another test from the original report - gh-13411
+    bounds = optimize.Bounds(lb=[0,], ub=[1,], keep_feasible=[True,])
+
+    def func(x):
+        assert x >= 0 and x <= 1
+        return np.exp(x)
+
+    optimize.minimize(fun=func, x0=[0.5], method='powell', bounds=bounds)
+
 
 class TestRosen: