tests: add example class test

test/test_example_module.py

@@ -1,11 +1,16 @@
 import numpy as np 
 
-from py_template.example_module import fibonacci
+from py_template.example_module import fibonacci, SoftwareGroup
 
-def test_fibonacci():
-    """Check the Fibonacci sequence function"""
+def test_example_function():
+    """Check the Fibonacci sequence function returns correct result"""
     fib = fibonacci(10)
     np.testing.assert_allclose(actual=fib, 
                                desired=[1, 1, 2, 3, 5, 8, 13, 21, 34, 55],
                                rtol=1e0,
-    )
+    )
+
+def test_example_class():
+    """Check the SoftwareGroup class can be instantiated and its class method called"""
+    sg = SoftwareGroup(people='us', purpose='fun')
+    sg.long_term_goals()