feat(test): add testing to PromQL

test/promql.spec.ts

@@ -0,0 +1,19 @@
+import { expect } from 'chai'
+import Greptime from '../src'
+
+describe('Greptime PromQL testing', function () {
+  const greptime = Greptime({})
+  const promQL = greptime.promQL
+
+  it('PromQL testing', async function () {
+    const { schema, rows } = await promQL.query('avg(cpu_metrics)').start(1680276000).end(1680576000).step('1s').run()
+
+    for (let key of Object.keys(schema[0])) {
+      expect(key).to.be.oneOf(['name', 'data_type'])
+    }
+
+    for (let i = 1680308000, j = 0; i <= 1680576000; i = i + 1000, j++) {
+      expect(rows[j][0].toString()).to.be.equal(i.toString())
+    }
+  })
+})