diff --git a/tests/test_jnius_config.py b/tests/test_jnius_config.py
index 8b06d4f..62147fa 100644
--- a/tests/test_jnius_config.py
+++ b/tests/test_jnius_config.py
@@ -8,10 +8,32 @@ class TestJniusConfig:
         """Resets the options global."""
         jnius_config.options = []
         jnius_config.vm_running = False
+        jnius_config.classpath = None
 
     def teardown_method(self):
         self.setup_method()
 
+    @pytest.mark.parametrize(
+        "function,args",
+        [
+            (jnius_config.set_options, ("option1",)),
+            (jnius_config.add_options, ("option1",)),
+            (jnius_config.set_classpath, (".",)),
+            (jnius_config.add_classpath, (".",)),
+        ],
+    )
+    def test_set_options_vm_running(self, function, args):
+        """The functions should only raise an error when the vm is running."""
+        assert jnius_config.vm_running is False
+        function(*args)
+        jnius_config.vm_running = True
+        with pytest.raises(ValueError) as ex_info:
+            function(*args)
+        pytest.mark.skipif(
+            sys.version_info < (3, 5), reason="Exception args are different on Python 2"
+        )
+        assert "VM is already running, can't set" in ex_info.value.args[0]
+
     def test_set_options(self):
         assert jnius_config.vm_running is False
         assert jnius_config.options == []
@@ -20,16 +42,26 @@ class TestJniusConfig:
         jnius_config.set_options("option3")
         assert jnius_config.options == ["option3"]
 
-    def test_set_options_vm_running(self):
+    def test_add_options(self):
         assert jnius_config.vm_running is False
-        jnius_config.set_options("option1", "option2")
-        jnius_config.vm_running = True
-        with pytest.raises(ValueError) as ex_info:
-            jnius_config.set_options("option1", "option2")
-        pytest.mark.skipif(
-            sys.version_info < (3, 5), reason="Exception args are different on Python 2"
-        )
-        assert (
-            "VM is already running, can't set options; VM started at"
-            in ex_info.value.args[0]
-        )
+        assert jnius_config.options == []
+        jnius_config.add_options("option1", "option2")
+        assert jnius_config.options == ["option1", "option2"]
+        jnius_config.add_options("option3")
+        assert jnius_config.options == ["option1", "option2", "option3"]
+
+    def test_set_classpath(self):
+        assert jnius_config.vm_running is False
+        assert jnius_config.classpath is None
+        jnius_config.set_classpath(".")
+        assert jnius_config.classpath == ["."]
+        jnius_config.set_classpath(".", "/usr/local/fem/plugins/*")
+        assert jnius_config.classpath == [".", "/usr/local/fem/plugins/*"]
+
+    def test_add_classpath(self):
+        assert jnius_config.vm_running is False
+        assert jnius_config.classpath is None
+        jnius_config.add_classpath(".")
+        assert jnius_config.classpath == ["."]
+        jnius_config.add_classpath("/usr/local/fem/plugins/*")
+        assert jnius_config.classpath == [".", "/usr/local/fem/plugins/*"]