Add pySwarm code - tests.

.privateWordDictionary

@@ -7,6 +7,8 @@ docstring
 OK
 tuple
 pyswarm
+PSO
 tisimst
 github
 https
+PSO

grortir/test/externals/__init__.py

@@ -0,0 +1 @@
+"""Package for test externals package."""

grortir/test/externals/pyswarm/__init__.py

@@ -0,0 +1 @@
+"""Package for tests pyswarm."""

grortir/test/externals/pyswarm/test_pyswarm.py

@@ -0,0 +1,30 @@
+"""Tests for pyswarm."""
+from unittest import TestCase
+from grortir.externals.pyswarm.pso import pso
+
+
+class TestPso(TestCase):
+    """Class for tests pyswarm."""
+
+    def test_run_simple_pso(self):
+        """Test running library."""
+        lower_bound = [-3, -1]
+        upper_bound = [2, 6]
+
+        x_opt, f_opt = pso(myfunc, lower_bound, upper_bound)
+        self.assertIsNotNone(x_opt)
+        self.assertIsNotNone(f_opt)
+
+
+def myfunc(input_vector):
+    """Simple function for tests.
+
+    Args:
+        input_vector (list): input vector
+
+    Returns:
+        object : value of function
+    """
+    x_1 = input_vector[0]
+    x_2 = input_vector[1]
+    return x_1 ** 4 - 2 * x_2 * x_1 ** 2 + x_2 ** 2 + x_1 ** 2 - 2 * x_1 + 5