diff --git a/spec/api-app-spec.js b/spec/api-app-spec.js
index cf25dde6e557..01fb304a24fa 100644
--- a/spec/api-app-spec.js
+++ b/spec/api-app-spec.js
@@ -403,4 +403,40 @@ describe('app module', function () {
       w.webContents.loadURL(secureUrl)
     })
   })
+
+  describe('setAsDefaultProtocolClient(protocol, path, args)', () => {
+    if (process.platform !== 'win32') return
+
+    const protocol = 'electron-test'
+    const updateExe = path.resolve(path.dirname(process.execPath), '..', 'Update.exe')
+    const processStartArgs = [
+      '--processStart', `"${path.basename(process.execPath)}"`,
+      '--process-start-args', `"--hidden"`
+    ]
+
+    beforeEach(() => {
+      app.removeAsDefaultProtocolClient(protocol)
+      app.removeAsDefaultProtocolClient(protocol, updateExe, processStartArgs)
+    })
+
+    afterEach(() => {
+      app.removeAsDefaultProtocolClient(protocol)
+      assert.equal(app.isDefaultProtocolClient(protocol), false)
+      app.removeAsDefaultProtocolClient(protocol, updateExe, processStartArgs)
+      assert.equal(app.isDefaultProtocolClient(protocol, updateExe, processStartArgs), false)
+    })
+
+    it('sets the app as the default protocol client', () => {
+      assert.equal(app.isDefaultProtocolClient(protocol), false)
+      app.setAsDefaultProtocolClient(protocol)
+      assert.equal(app.isDefaultProtocolClient(protocol), true)
+    })
+
+    it('allows a custom path and args to be specified', () => {
+      assert.equal(app.isDefaultProtocolClient(protocol, updateExe, processStartArgs), false)
+      app.setAsDefaultProtocolClient(protocol, updateExe, processStartArgs)
+      assert.equal(app.isDefaultProtocolClient(protocol, updateExe, processStartArgs), true)
+      assert.equal(app.isDefaultProtocolClient(protocol), false)
+    })
+  })
 })