test: fix test by adding dependency

apps/emqx/rebar.config

@@ -46,7 +46,8 @@
             {meck, "0.9.2"},
             {proper, "1.4.0"},
             {bbmustache, "1.10.0"},
-            {emqtt, {git, "https://github.com/emqx/emqtt", {tag, "1.10.0"}}}
+            {emqtt, {git, "https://github.com/emqx/emqtt", {tag, "1.10.0"}}},
+            {emqx_rule_engine, {path, "../emqx_rule_engine"}}
         ]},
         {extra_src_dirs, [
             {"test", [recursive]},
@@ -58,7 +59,8 @@
             {meck, "0.9.2"},
             {proper, "1.4.0"},
             {bbmustache, "1.10.0"},
-            {emqtt, {git, "https://github.com/emqx/emqtt", {tag, "1.9.7"}}}
+            {emqtt, {git, "https://github.com/emqx/emqtt", {tag, "1.9.7"}}},
+            {emqx_rule_engine, {path, "../emqx_rule_engine"}}
         ]},
         {extra_src_dirs, [{"test", [recursive]}]}
     ]}