add test for modules load/unload and config rewrite

runtest-moduleapi

@@ -19,6 +19,7 @@ $TCLSH tests/test_helper.tcl \
 --single unit/moduleapi/fork \
 --single unit/moduleapi/testrdb \
 --single unit/moduleapi/infotest \
+--single unit/moduleapi/infra \
 --single unit/moduleapi/propagate \
 --single unit/moduleapi/hooks \
 --single unit/moduleapi/misc \

tests/unit/moduleapi/infra.tcl

@@ -0,0 +1,22 @@
+set testmodule [file normalize tests/modules/infotest.so]
+
+test {modules config rewrite} {
+
+    start_server {tags {"modules"}} {
+        r module load $testmodule
+
+        assert_equal [lindex [lindex [r module list] 0] 1] infotest
+
+        r config rewrite
+        restart_server 0 true false
+
+        assert_equal [lindex [lindex [r module list] 0] 1] infotest
+
+        r module unload infotest
+
+        r config rewrite
+        restart_server 0 true false
+
+        assert_equal [llength [r module list]] 0
+    }
+}