diff --git a/test/unit/instrumentation/opensearch.test.js b/test/unit/instrumentation/opensearch.test.js
new file mode 100644
index 0000000000..3589385a26
--- /dev/null
+++ b/test/unit/instrumentation/opensearch.test.js
@@ -0,0 +1,154 @@
+/*
+ * Copyright 2023 New Relic Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+'use strict'
+
+const test = require('node:test')
+const assert = require('node:assert')
+const {
+  parsePath,
+  queryParser
+} = require('../../../lib/instrumentation/@opensearch-project/opensearch')
+const instrumentation = require('../../../lib/instrumentation/@opensearch-project/opensearch')
+const methods = [
+  { name: 'GET', expected: 'get' },
+  { name: 'PUT', expected: 'create' },
+  { name: 'POST', expected: 'create' },
+  { name: 'DELETE', expected: 'delete' },
+  { name: 'HEAD', expected: 'exists' }
+]
+
+test('should log warning if version is not supported', async () => {
+  const shim = {
+    pkgVersion: '2.0.0',
+    logger: {
+      debug(msg) {
+        assert.equal(
+          msg,
+          'Opensearch support is for versions 2.1.0 and above. Not instrumenting 2.0.0.'
+        )
+      }
+    }
+  }
+  instrumentation({}, {}, '@opensearch-project/opensearch', shim)
+})
+test('parsePath should behave as expected', async (t) => {
+  await t.test('indices', async function () {
+    const path = '/indexName'
+    methods.forEach((m) => {
+      const { collection, operation } = parsePath(path, m.name)
+      const expectedOp = `index.${m.expected}`
+      assert.equal(collection, 'indexName', `index should be 'indexName'`)
+      assert.equal(operation, expectedOp, 'operation should include index and method')
+    })
+  })
+  await t.test('search of one index', async function () {
+    const path = '/indexName/_search'
+    methods.forEach((m) => {
+      const { collection, operation } = parsePath(path, m.name)
+      const expectedOp = `search`
+      assert.equal(collection, 'indexName', `index should be 'indexName'`)
+      assert.equal(operation, expectedOp, `operation should be 'search'`)
+    })
+  })
+  await t.test('search of all indices', async function () {
+    const path = '/_search/'
+    methods.forEach((m) => {
+      if (m.name === 'PUT') {
+        // skip PUT
+        return
+      }
+      const { collection, operation } = parsePath(path, m.name)
+      const expectedOp = `search`
+      assert.equal(collection, 'any', 'index should be `any`')
+      assert.equal(operation, expectedOp, `operation should match ${expectedOp}`)
+    })
+  })
+  await t.test('doc', async function () {
+    const path = '/indexName/_doc/testKey'
+    methods.forEach((m) => {
+      const { collection, operation } = parsePath(path, m.name)
+      const expectedOp = `doc.${m.expected}`
+      assert.equal(collection, 'indexName', `index should be 'indexName'`)
+      assert.equal(operation, expectedOp, `operation should match ${expectedOp}`)
+    })
+  })
+  await t.test('path is /', async function () {
+    const path = '/'
+    methods.forEach((m) => {
+      const { collection, operation } = parsePath(path, m.name)
+      const expectedOp = `index.${m.expected}`
+      assert.equal(collection, 'any', 'index should be `any`')
+      assert.equal(operation, expectedOp, `operation should match ${expectedOp}`)
+    })
+  })
+  await t.test(
+    'should provide sensible defaults when path is {} and parser encounters an error',
+    function () {
+      const path = {}
+      methods.forEach((m) => {
+        const { collection, operation } = parsePath(path, m.name)
+        const expectedOp = `unknown`
+        assert.equal(collection, 'any', 'index should be `any`')
+        assert.equal(operation, expectedOp, `operation should match '${expectedOp}'`)
+      })
+    }
+  )
+})
+
+test('queryParser should behave as expected', async (t) => {
+  await t.test('given a querystring, it should use that for query', () => {
+    const params = JSON.stringify({
+      path: '/_search',
+      method: 'GET',
+      querystring: { q: 'searchterm' }
+    })
+    const expected = {
+      collection: 'any',
+      operation: 'search',
+      query: JSON.stringify({ q: 'searchterm' })
+    }
+    const parseParams = queryParser(params)
+    assert.deepEqual(parseParams, expected, 'queryParser should handle query strings')
+  })
+  await t.test('given a body, it should use that for query', () => {
+    const params = JSON.stringify({
+      path: '/_search',
+      method: 'POST',
+      body: { match: { body: 'document' } }
+    })
+    const expected = {
+      collection: 'any',
+      operation: 'search',
+      query: JSON.stringify({ match: { body: 'document' } })
+    }
+    const parseParams = queryParser(params)
+    assert.deepEqual(parseParams, expected, 'queryParser should handle query body')
+  })
+  await t.test('given a bulkBody, it should use that for query', () => {
+    const params = JSON.stringify({
+      path: '/_msearch',
+      method: 'POST',
+      bulkBody: [
+        {}, // cross-index searches have can have an empty metadata section
+        { query: { match: { body: 'sixth' } } },
+        {},
+        { query: { match: { body: 'bulk' } } }
+      ]
+    })
+    const expected = {
+      collection: 'any',
+      operation: 'msearch.create',
+      query: JSON.stringify([
+        {}, // cross-index searches have can have an empty metadata section
+        { query: { match: { body: 'sixth' } } },
+        {},
+        { query: { match: { body: 'bulk' } } }
+      ])
+    }
+    const parseParams = queryParser(params)
+    assert.deepEqual(parseParams, expected, 'queryParser should handle query body')
+  })
+})