Fix typo for --test parsing

Author: joyeecheung

cli.js

@@ -119,7 +119,7 @@ const printHelp = cliParams.delete("help");
 const dumpTestList = cliParams.delete("dumpTestList");
 
 if (cliArgs.length) {
-    let tests = cliParams.has("test") ? cliParams.get("tests").split(",") : []
+    let tests = cliParams.has("test") ? cliParams.get("test").split(",") : []
     tests = tests.concat(cliArgs);
     cliParams.set("test", tests.join(","));
 }

tests/run-shell.mjs

@@ -81,6 +81,13 @@ const TESTS = [
             return runCLITest("Grouped with Details", shell_binary, "SunSpider", "--group-details");
         },
     },
+    {
+        name: "Test Flag With Positional Args",
+        tags: ["all", "main", "test-flag"],
+        run(shell_binary) {
+            return runCLITest("Test Flag With Positional Args", shell_binary, "--test=proxy-mobx", "proxy");
+        },
+    },
     {
         name: "Disabled Suite",
         tags: ["all", "disabled"],