Implemented test run editor's test case selection

backend/routes/runcases/index.js

@@ -0,0 +1,30 @@
+const express = require("express");
+const router = express.Router();
+const defineRunCase = require("../../models/runCases");
+const { DataTypes } = require('sequelize');
+
+module.exports = function(sequelize) {
+  const RunCase = defineRunCase(sequelize, DataTypes)
+
+  router.get("/", async (req, res) => {
+    const { runId } = req.query;
+
+    if (!runId) {
+      return res.status(400).json({ error: 'run is required' });
+    }
+
+    try {
+      const runCases = await RunCase.findAll({
+        where: {
+          runId: runId
+        }
+      });
+      res.json(runCases);
+    } catch (error) {
+      console.error(error);
+      res.status(500).send("Internal Server Error");
+    }
+  });
+
+  return router;
+};