Improve usecases 'func_proc{,_pnt}'. (#1182)

Check that if there's multiple instances of the mechanisms the functions
and procedures use the values for the correct instance.

test/usecases/func_proc/func_proc.mod

@@ -15,8 +15,8 @@ PROCEDURE set_x_a(a) {
     x = a
 }
 
-FUNCTION get_a_42(a) {
-    get_a_42 = a + 42
+FUNCTION x_plus_a(a) {
+    x_plus_a = x + a
 }
 
 PROCEDURE set_a_x() {

test/usecases/func_proc/simulate.py

@@ -1,15 +1,23 @@
 from neuron import h
 
+nseg = 5
 s = h.Section()
+s.nseg = nseg
 
 s.insert("test_func_proc")
 
-s(0.5).test_func_proc.set_x_42()
+coords = [(0.5 + k) * 1.0 / nseg for k in range(nseg)]
+values = [ 0.1 + k for k in range(nseg)]
 
-assert s(0.5).test_func_proc.x == 42
+for x in coords:
+    s(x).test_func_proc.set_x_42()
+    assert s(x).test_func_proc.x == 42
 
-s(0.5).test_func_proc.set_x_a(13.7)
+for x, value in zip(coords, values):
+    s(x).test_func_proc.set_x_a(value)
 
-assert s(0.5).test_func_proc.x == 13.7
+for x, value in zip(coords, values):
+    assert s(x).test_func_proc.x == value
 
-assert s(0.5).test_func_proc.get_a_42(42) == 84
+for x, value in zip(coords, values):
+    assert s(x).test_func_proc.x_plus_a(100.0) == 100.0 + value

test/usecases/func_proc_pnt/func_proc_pnt.mod

@@ -15,6 +15,6 @@ PROCEDURE set_x_a(a) {
     x = a
 }
 
-FUNCTION get_a_42(a) {
-    get_a_42 = a + 42
+FUNCTION x_plus_a(a) {
+    x_plus_a = x + a
 }

test/usecases/func_proc_pnt/simulate.py

@@ -1,15 +1,27 @@
 from neuron import h
 
+nseg = 5
 s = h.Section()
+s.nseg = nseg
 
-pnt_proc = h.test_func_proc_pnt(s(0.5))
+point_processes = []
+for k in range(nseg):
+    x = (0.5 + k) * 1.0 / nseg
+    point_processes.append(h.test_func_proc_pnt(s(x)))
 
-pnt_proc.set_x_42()
+for k in range(nseg):
+    point_processes[k].set_x_42()
 
-assert pnt_proc.x == 42
+for k in range(nseg):
+    assert point_processes[k].x == 42
 
-pnt_proc.set_x_a(13.7)
+for k in range(nseg):
+    value = 0.1 + k
+    point_processes[k].set_x_a(value)
 
-assert pnt_proc.x == 13.7
+for k in range(nseg):
+    value = 0.1 + k
+    assert point_processes[k].x == value
+    assert point_processes[k].x_plus_a(1000.0) == 1000.0 + value
 
-assert pnt_proc.get_a_42(42) == 84
+print([point_processes[k].x for k in range(nseg)])