test: install chai as assertion library

package-lock.json

@@ -403,6 +403,12 @@
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       "dev": true
     },
+    "@types/chai": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.3.tgz",
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+      "dev": true
+    },
     "@types/electron-packager": {
       "version": "14.0.0",
       "resolved": "https://registry.npmjs.org/@types/electron-packager/-/electron-packager-14.0.0.tgz",
@@ -1100,6 +1106,12 @@
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
+    "assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true
+    },
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       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
@@ -1656,6 +1668,20 @@
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
     },
+    "chai": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
+      "integrity": "sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==",
+      "dev": true,
+      "requires": {
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.2",
+        "deep-eql": "^3.0.1",
+        "get-func-name": "^2.0.0",
+        "pathval": "^1.1.0",
+        "type-detect": "^4.0.5"
+      }
+    },
     "chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -1672,6 +1698,12 @@
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       "dev": true
     },
+    "check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
+    },
     "chokidar": {
       "version": "2.1.6",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.6.tgz",
@@ -2356,6 +2388,15 @@
         "mimic-response": "^1.0.0"
       }
     },
+    "deep-eql": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
+      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "dev": true,
+      "requires": {
+        "type-detect": "^4.0.0"
+      }
+    },
     "deep-extend": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
@@ -4574,6 +4615,12 @@
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
       "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg=="
     },
+    "get-func-name": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
+      "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
+      "dev": true
+    },
     "get-installed-path": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/get-installed-path/-/get-installed-path-2.1.1.tgz",
@@ -7587,6 +7634,12 @@
         "pify": "^2.0.0"
       }
     },
+    "pathval": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
+      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
+      "dev": true
+    },
     "pbkdf2": {
       "version": "3.0.17",
       "resolved": "https://registry.npmjs.org/pbkdf2/-/pbkdf2-3.0.17.tgz",
@@ -9663,6 +9716,12 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
     "type-fest": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.5.2.tgz",

package.json

@@ -35,6 +35,7 @@
   "devDependencies": {
     "@electron-forge/cli": "^6.0.0-beta.45",
     "@electron-forge/maker-squirrel": "^6.0.0-beta.45",
+    "@types/chai": "^4.2.3",
     "@types/jsdom": "latest",
     "@types/minimist": "latest",
     "@types/mocha": "latest",
@@ -42,6 +43,7 @@
     "@types/node-fetch": "latest",
     "@types/webdriverio": "^4.13.3",
     "@types/webpack": "latest",
+    "chai": "^4.2.0",
     "electron": "^6.0.11",
     "electron-rebuild": "^1.8.6",
     "eslint": "latest",

test/integration/launch.spec.ts

@@ -1,4 +1,4 @@
-import * as assert from 'assert';
+import { expect } from 'chai';
 import * as electron from 'electron';
 import { afterEach, beforeEach, describe, it } from 'mocha';
 import { Application } from 'spectron';
@@ -24,7 +24,7 @@ describe('Application Launch', function(): void {
 
   it('shows an initial window', function(): any {
     return this.app.client.getWindowCount().then((count: number) => {
-      assert.strictEqual(count, 1);
+      expect(count).to.equal(1, 'there is not one window open on app start');
     });
   });
 });