Adding tests for Firepower Management 6.0 RCE (#528)

tests/exploits/routers/cisco/test_firepower_management60_rce.py

+from routersploit.modules.exploits.routers.cisco.firepower_management60_rce import Exploit
+
+
+def test_check_success(target):
+    """ Test scenario - successful check """
+
+    route_mock = target.get_route_mock("/img/favicon.png?v=6.0.1-1213", methods=["GET"])
+    route_mock.return_value = (
+        "TEST"
+    )
+
+    exploit = Exploit()
+
+    assert exploit.target == ""
+    assert exploit.port == 443
+    assert exploit.ssl is True
+    assert exploit.ssh_port == 22
+    assert exploit.username == "admin"
+    assert exploit.password == "Admin123"
+    assert exploit.newusername == ""
+    assert exploit.newpassword == ""
+
+    exploit.target = target.host
+    exploit.port = target.port
+
+    assert exploit.check() is False
+    assert exploit.run() is None