test cover globals and parameters.

test/usecases/global/global.mod

@@ -0,0 +1,16 @@
+NEURON {
+    SUFFIX global
+    GLOBAL gbl
+}
+
+ASSIGNED {
+    gbl
+}
+
+FUNCTION get_gbl() {
+    get_gbl = gbl
+}
+
+PROCEDURE set_gbl(value) {
+    gbl = value
+}

test/usecases/global/parameter.mod

@@ -0,0 +1,11 @@
+NEURON {
+    SUFFIX parameter
+}
+
+PARAMETER {
+    gbl = 42.0
+}
+
+FUNCTION get_gbl() {
+    get_gbl = gbl
+}

test/usecases/global/test_without_instance.py

@@ -1,18 +1,24 @@
 from neuron import h, gui
 
 
-def make_accessors(mech_name):
+def make_accessors(mech_name, read_only):
     get = getattr(h, f"get_gbl_{mech_name}")
-    set = getattr(h, f"set_gbl_{mech_name}")
 
+    if read_only:
+        return get, None
+
+    set = getattr(h, f"set_gbl_{mech_name}")
     return get, set
 
 
-def check_write_read_cycle(mech_name):
-    get, set = make_accessors(mech_name)
+def check_write_read_cycle(mech_name, read_only=False):
+    get, set = make_accessors(mech_name, read_only)
 
-    expected = 278.045
-    set(expected)
+    if read_only:
+        expected = 42.0
+    else:
+        expected = 278.045
+        set(expected)
 
     actual = get()
     assert (
@@ -24,5 +30,15 @@ def test_top_local():
     check_write_read_cycle("top_local")
 
 
+def test_global():
+    check_write_read_cycle("global")
+
+
+def test_parameter():
+    check_write_read_cycle("parameter", True)
+
+
 if __name__ == "__main__":
     test_top_local()
+    test_global()
+    test_parameter()