Add tests for PATCH requests

.travis.yml

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+language: node_js
+install: npm install
+script: npm test

test/data/hold-requests%2F1234-patch.json

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+{
+  "data": {
+    "id": 1234,
+    "jobId": "1106896193cb7216d96",
+    "createdDate": "2021-11-16T10:17:06-05:00",
+    "updatedDate": "2021-11-16T10:17:12-05:00",
+    "success": false,
+    "processed": true,
+    "patron": "987654321",
+    "nyplSource": "sierra-nypl",
+    "requestType": "hold",
+    "recordType": "i",
+    "record": "15371503",
+    "pickupLocation": "",
+    "deliveryLocation": "NH",
+    "neededBy": "2022-11-16T00:00:00-05:00",
+    "numberOfCopies": 1,
+    "docDeliveryData": null,
+    "error": null
+  },
+  "count": 1,
+  "statusCode": 200,
+  "debugInfo": []
+}

test/patch-test.js

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+let client = null
+
+describe('Client PATCH method', function () {
+  beforeEach(() => {
+    client = require('./make-test-client')()
+  })
+
+  afterEach(() => {
+    client = null
+  })
+
+  // This is a common patch that the
+  // [HoldRequestResultConsumer makes](https://github.com/NYPL/hold-request-result-consumer/blob/e7bd5b04afe25cf65ed2a5ce2de0576973e592cb/src/OAuthClient/HoldRequestClient.php#L123)
+  // makes when it detects a hold-request has been fulfilled
+  var holdRequestPatch = {
+    success: true,
+    processed: true
+  }
+
+  describe('when config.json=true (default)', function () {
+    it('should accept a new schema object via PATCH and return an object', function () {
+      return client.patch('hold-requests/1234', holdRequestPatch)
+        .then((resp) => {
+          expect(resp).to.be.a('object')
+        })
+    })
+
+    it('should fail if supplied body is plaintext', function () {
+      let call = client.patch('hold-requests/1234', JSON.stringify(holdRequestPatch))
+      return expect(call).to.be.rejected
+    })
+
+    // A null/empty body should be accepted as valid if options.json===true
+    it('should succeed if supplied body is empty', function () {
+      let call = client.patch('hold-requests/1234')
+      return expect(call).to.be.fulfilled
+    })
+  })
+
+  describe('when config.json=false', function () {
+    it('should accept a plaintext body and return plain text', function () {
+      let call = client.patch('hold-requests/1234', JSON.stringify(holdRequestPatch), { json: false })
+      return Promise.all([
+        expect(call).to.be.fulfilled,
+        expect(call).to.eventually.be.a('string')
+      ])
+    })
+
+    it('should fail if supplied body is not plaintext', function () {
+      let call = client.patch('hold-requests/1234', holdRequestPatch, { json: false })
+      return expect(call).to.be.rejected
+    })
+  })
+})