diff --git a/package-lock.json b/package-lock.json
index ed31379..039c6bd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,6 +14,7 @@
       },
       "devDependencies": {
         "chai": "^4.2.0",
+        "chai-as-promised": "^7.1.1",
         "license-check-and-add": "^3.0.4",
         "mocha": "^8.2.0",
         "sinon": "^9.2.0",
@@ -547,6 +548,18 @@
         "type-detect": "^4.0.5"
       }
     },
+    "node_modules/chai-as-promised": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/chai-as-promised/-/chai-as-promised-7.1.1.tgz",
+      "integrity": "sha512-azL6xMoi+uxu6z4rhWQ1jbdUhOMhis2PvscD/xjLqNMkv3BPPp2JyyuTHOrf9BOosGpNQ11v6BKv/g57RXbiaA==",
+      "dev": true,
+      "dependencies": {
+        "check-error": "^1.0.2"
+      },
+      "peerDependencies": {
+        "chai": ">= 2.1.2 < 5"
+      }
+    },
     "node_modules/chalk": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
@@ -3296,6 +3309,15 @@
         "type-detect": "^4.0.5"
       }
     },
+    "chai-as-promised": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/chai-as-promised/-/chai-as-promised-7.1.1.tgz",
+      "integrity": "sha512-azL6xMoi+uxu6z4rhWQ1jbdUhOMhis2PvscD/xjLqNMkv3BPPp2JyyuTHOrf9BOosGpNQ11v6BKv/g57RXbiaA==",
+      "dev": true,
+      "requires": {
+        "check-error": "^1.0.2"
+      }
+    },
     "chalk": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
diff --git a/package.json b/package.json
index 328a6a4..bd0c77a 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
+    "chai-as-promised": "^7.1.1",
     "license-check-and-add": "^3.0.4",
     "mocha": "^8.2.0",
     "sinon": "^9.2.0",
diff --git a/test/serviceproviders.test.js b/test/serviceproviders.test.js
index 6452dee..072570c 100644
--- a/test/serviceproviders.test.js
+++ b/test/serviceproviders.test.js
@@ -13,8 +13,11 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-const expect = require('chai').expect
-const assert = require('chai').assert
+const chai = require('chai')
+const expect = chai.expect
+const chaiAsPromised = require("chai-as-promised")
+chai.use(chaiAsPromised)
+
 const request = require('supertest')
 const doipjs = require('../src')
 
diff --git a/test/verify.test.js b/test/verify.test.js
index 3553945..23151ba 100644
--- a/test/verify.test.js
+++ b/test/verify.test.js
@@ -13,8 +13,11 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-const expect = require('chai').expect
-const assert = require('chai').assert
+const chai = require('chai')
+const expect = chai.expect
+const chaiAsPromised = require("chai-as-promised")
+chai.use(chaiAsPromised)
+
 const request = require('supertest')
 const doipjs = require('../src')
 
@@ -24,29 +27,29 @@ describe('verify', () => {
     expect(doipjs.verify).to.have.length(3)
   })
   it('should throw an error for non-valid URIs', () => {
-    expect(() => { doipjs.verify('noURI') }).to.throw('Not a valid URI')
-    expect(() => { doipjs.verify('domain.org') }).to.throw('Not a valid URI')
+    return expect(doipjs.verify('noURI')).to.eventually.be.rejectedWith('Not a valid URI')
+    return expect(doipjs.verify('domain.org')).to.eventually.be.rejectedWith('Not a valid URI')
   })
-  it('should match "dns:domain.org" to the DNS service provider', () => {
-    const matches = doipjs.verify('dns:domain.org', null, {returnMatchesOnly: true})
+  it('should match "dns:domain.org" to the DNS service provider', async () => {
+    const matches = await doipjs.verify('dns:domain.org', null, {returnMatchesOnly: true})
     expect(matches).to.be.a('array')
     expect(matches).to.be.length(1)
     expect(matches[0].serviceprovider.name).to.be.equal('domain')
   })
-  it('should match "xmpp:alice@domain.org" to the XMPP service provider', () => {
-    const matches = doipjs.verify('xmpp:alice@domain.org', null, {returnMatchesOnly: true})
+  it('should match "xmpp:alice@domain.org" to the XMPP service provider', async () => {
+    const matches = await doipjs.verify('xmpp:alice@domain.org', null, {returnMatchesOnly: true})
     expect(matches).to.be.a('array')
     expect(matches).to.be.length(1)
     expect(matches[0].serviceprovider.name).to.be.equal('xmpp')
   })
-  it('should match "https://twitter.com/alice/status/1234567890123456789" to the Twitter service provider', () => {
-    const matches = doipjs.verify('https://twitter.com/alice/status/1234567890123456789', null, {returnMatchesOnly: true})
+  it('should match "https://twitter.com/alice/status/1234567890123456789" to the Twitter service provider', async () => {
+    const matches = await doipjs.verify('https://twitter.com/alice/status/1234567890123456789', null, {returnMatchesOnly: true})
     expect(matches).to.be.a('array')
     expect(matches).to.be.length(1)
     expect(matches[0].serviceprovider.name).to.be.equal('twitter')
   })
-  it('should match "https://news.ycombinator.com/user?id=Alice" to the Hackernews service provider', () => {
-    const matches = doipjs.verify('https://news.ycombinator.com/user?id=Alice', null, {returnMatchesOnly: true})
+  it('should match "https://news.ycombinator.com/user?id=Alice" to the Hackernews service provider', async () => {
+    const matches = await doipjs.verify('https://news.ycombinator.com/user?id=Alice', null, {returnMatchesOnly: true})
     expect(matches).to.be.a('array')
     expect(matches).to.be.length(1)
     expect(matches[0].serviceprovider.name).to.be.equal('hackernews')