tweak

internals/plan/extensions_test.go

@@ -426,8 +426,9 @@ nexttest:
 }
 
 // TestSectionOrderExt ensures built-in and extension section ordering
-// does not change. Extensions are ordered according to the order of
-// registration.
+// rules are maintained. Extensions are ordered according to the order of
+// registration and follows the built-in sections which are ordered
+// the same way they are defined in the Plan struct.
 func (s *S) TestSectionOrderExt(c *C) {
 	plan.RegisterExtension("x-field", &xExtension{})
 	plan.RegisterExtension("y-field", &yExtension{})

internals/plan/plan_test.go

@@ -2110,7 +2110,8 @@ func firstLetterToLower(s string) string {
 	return string(r)
 }
 
-// TestSectionOrder ensures built-in section order is maintained.
+// TestSectionOrder ensures built-in section order is maintained
+// during Plan marshal operations.
 func (s *S) TestSectionOrder(c *C) {
 	layer, err := plan.ParseLayer(1, "label", reindent(`
 	checks: