diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..1c28cf7
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,5 @@
+module.exports = {
+    preset: 'ts-jest',
+    testEnvironment: 'jsdom',
+    roots: ['src']
+};
diff --git a/package-lock.json b/package-lock.json
index 4ddd819..dede688 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -23,9 +23,9 @@
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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@@ -86,9 +86,9 @@
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@@ -131,9 +131,9 @@
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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@@ -180,9 +180,9 @@
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+          "version": "4.17.15",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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@@ -259,9 +259,9 @@
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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@@ -291,9 +291,9 @@
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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@@ -593,9 +593,9 @@
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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@@ -1150,9 +1150,9 @@
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@@ -1163,6 +1163,277 @@
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+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
       "dev": true,
       "requires": {
         "arr-union": "^3.1.0",
         "get-value": "^2.0.6",
         "is-extendable": "^0.1.1",
-        "set-value": "^0.4.3"
-      },
-      "dependencies": {
-        "extend-shallow": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
-          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
-          "dev": true,
-          "requires": {
-            "is-extendable": "^0.1.0"
-          }
-        },
-        "set-value": {
-          "version": "0.4.3",
-          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
-          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
-          "dev": true,
-          "requires": {
-            "extend-shallow": "^2.0.1",
-            "is-extendable": "^0.1.1",
-            "is-plain-object": "^2.0.1",
-            "to-object-path": "^0.3.0"
-          }
-        }
+        "set-value": "^2.0.1"
       }
     },
     "unique-filename": {
@@ -14094,12 +16309,30 @@
       "integrity": "sha1-wGavtYK7HLQSjWDqkjkulNXp2+w=",
       "dev": true
     },
+    "w3c-hr-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.1.tgz",
+      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "^0.1.2"
+      }
+    },
     "walkdir": {
       "version": "0.0.11",
       "resolved": "https://registry.npmjs.org/walkdir/-/walkdir-0.0.11.tgz",
       "integrity": "sha1-oW0CXrkxvQO1LzCMrtD0D86+lTI=",
       "dev": true
     },
+    "walker": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
     "watchpack": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.6.0.tgz",
@@ -14111,6 +16344,12 @@
         "neo-async": "^2.5.0"
       }
     },
+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
+    },
     "webpack": {
       "version": "4.29.6",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.29.6.tgz",
@@ -14427,6 +16666,43 @@
         }
       }
     },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      },
+      "dependencies": {
+        "iconv-lite": {
+          "version": "0.4.24",
+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+          "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
+          "dev": true,
+          "requires": {
+            "safer-buffer": ">= 2.1.2 < 3"
+          }
+        }
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-6.5.0.tgz",
+      "integrity": "sha512-rhRZRqx/TLJQWUpQ6bmrt2UV4f0HCQ463yQuONJqC6fO2VoEb1pTYddbe59SkYq87aoM5A3bdhMZiUiVws+fzQ==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -14513,6 +16789,26 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
+      "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "ws": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
+      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
     "xhr": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/xhr/-/xhr-2.5.0.tgz",
@@ -14525,6 +16821,12 @@
         "xtend": "^4.0.0"
       }
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
     "xml-parse-from-string": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/xml-parse-from-string/-/xml-parse-from-string-1.0.1.tgz",
diff --git a/package.json b/package.json
index 6a60202..2f65888 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
     "@babel/preset-flow": "^7.0.0",
     "@types/chai": "^4.1.7",
     "@types/glob": "^7.1.1",
+    "@types/jest": "^24.0.18",
     "@types/mocha": "^5.2.6",
     "@types/node": "^11.13.2",
     "@types/platform": "^1.3.2",
@@ -53,6 +54,7 @@
     "filenamify-url": "1.0.0",
     "glob": "7.1.3",
     "html2canvas-proxy": "1.0.1",
+    "jest": "^24.9.0",
     "jquery": "^3.4.0",
     "js-polyfills": "^0.1.42",
     "karma": "^4.0.1",
@@ -79,6 +81,7 @@
     "serve-index": "^1.9.1",
     "slash": "1.0.0",
     "standard-version": "^5.0.2",
+    "ts-jest": "^24.1.0",
     "ts-loader": "^5.3.3",
     "ts-node": "^8.0.3",
     "typescript": "^3.4.3",
@@ -99,7 +102,7 @@
     "format": "prettier --write \"{src,www/src,tests,scripts}/**/*.ts\"",
     "lint": "eslint src/**/*.ts",
     "test": "npm run lint && npm run unittest && npm run karma",
-    "unittest": "mocha --require ts-node/register src/**/__tests__/*.ts",
+    "unittest": "jest",
     "karma": "node karma",
     "watch": "rollup -c rollup.config.ts -w",
     "watch:unittest": "mocha --require ts-node/register --watch-extensions ts -w src/**/__tests__/*.ts",
diff --git a/src/core/__mocks__/cache-storage.ts b/src/core/__mocks__/cache-storage.ts
new file mode 100644
index 0000000..864e002
--- /dev/null
+++ b/src/core/__mocks__/cache-storage.ts
@@ -0,0 +1,22 @@
+class MockCache {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    private readonly _cache: {[key: string]: Promise<any>};
+
+    constructor() {
+        this._cache = {};
+    }
+
+    addImage(src: string): Promise<void> {
+        const result = Promise.resolve();
+        this._cache[src] = result;
+        return result;
+    }
+}
+
+const current = new MockCache();
+
+export class CacheStorage {
+    static getInstance(): MockCache {
+        return current;
+    }
+}
diff --git a/src/core/__mocks__/features.ts b/src/core/__mocks__/features.ts
new file mode 100644
index 0000000..58b59cc
--- /dev/null
+++ b/src/core/__mocks__/features.ts
@@ -0,0 +1,8 @@
+export const FEATURES = {
+    SUPPORT_RANGE_BOUNDS: true,
+    SUPPORT_SVG_DRAWING: true,
+    SUPPORT_FOREIGNOBJECT_DRAWING: true,
+    SUPPORT_CORS_IMAGES: true,
+    SUPPORT_RESPONSE_TYPE: true,
+    SUPPORT_CORS_XHR: true
+};
diff --git a/src/core/__tests__/cache-storage.ts b/src/core/__tests__/cache-storage.ts
index 69a3b12..c738284 100644
--- a/src/core/__tests__/cache-storage.ts
+++ b/src/core/__tests__/cache-storage.ts
@@ -1,6 +1,49 @@
 import {deepStrictEqual, fail} from 'assert';
 import {FEATURES} from '../features';
-import {createMockContext, proxy} from './mock-context';
+import {CacheStorage} from '../cache-storage';
+import {Logger} from '../logger';
+
+const proxy = 'http://example.com/proxy';
+
+const createMockContext = (origin: string, opts = {}) => {
+    const context = {
+        location: {
+            href: origin
+        },
+        document: {
+            createElement(_name: string) {
+                let _href = '';
+                return {
+                    set href(value: string) {
+                        _href = value;
+                    },
+                    get href() {
+                        return _href;
+                    },
+                    get protocol() {
+                        return new URL(_href).protocol;
+                    },
+                    get hostname() {
+                        return new URL(_href).hostname;
+                    },
+                    get port() {
+                        return new URL(_href).port;
+                    }
+                };
+            }
+        }
+    };
+
+    CacheStorage.setContext(context as Window);
+    Logger.create({id: 'test', enabled: false});
+    return CacheStorage.create('test', {
+        imageTimeout: 0,
+        useCORS: false,
+        allowTaint: false,
+        proxy,
+        ...opts
+    });
+};
 
 const images: ImageMock[] = [];
 const xhr: XMLHttpRequestMock[] = [];
diff --git a/src/core/__tests__/logger.ts b/src/core/__tests__/logger.ts
new file mode 100644
index 0000000..ff921f5
--- /dev/null
+++ b/src/core/__tests__/logger.ts
@@ -0,0 +1,27 @@
+import {Logger} from '../logger';
+
+describe('logger', () => {
+    let infoSpy: any;
+
+    beforeEach(() => {
+        infoSpy = jest.spyOn(console, 'info').mockImplementation(() => {});
+    });
+
+    afterEach(() => {
+        infoSpy.mockRestore();
+    });
+
+    it('should call console.info when logger enabled', () => {
+        const id = Math.random().toString();
+        const logger = new Logger({id, enabled: true});
+        logger.info('testing');
+        expect(infoSpy).toHaveBeenLastCalledWith(id, expect.stringMatching(/\d+ms/), 'testing');
+    });
+
+    it("shouldn't call console.info when logger disabled", () => {
+        const id = Math.random().toString();
+        const logger = new Logger({id, enabled: false});
+        logger.info('testing');
+        expect(infoSpy).not.toHaveBeenCalled();
+    });
+});
diff --git a/src/core/__tests__/mock-context.ts b/src/core/__tests__/mock-context.ts
deleted file mode 100644
index 3547273..0000000
--- a/src/core/__tests__/mock-context.ts
+++ /dev/null
@@ -1,45 +0,0 @@
-import {CacheStorage} from '../cache-storage';
-import {URL} from 'url';
-import {Logger} from '../logger';
-
-export const proxy = 'http://example.com/proxy';
-
-export const createMockContext = (origin: string, opts = {}) => {
-    const context = {
-        location: {
-            href: origin
-        },
-        document: {
-            createElement(_name: string) {
-                let _href = '';
-                return {
-                    set href(value: string) {
-                        _href = value;
-                    },
-                    get href() {
-                        return _href;
-                    },
-                    get protocol() {
-                        return new URL(_href).protocol;
-                    },
-                    get hostname() {
-                        return new URL(_href).hostname;
-                    },
-                    get port() {
-                        return new URL(_href).port;
-                    }
-                };
-            }
-        }
-    };
-
-    CacheStorage.setContext(context as Window);
-    Logger.create('test');
-    return CacheStorage.create('test', {
-        imageTimeout: 0,
-        useCORS: false,
-        allowTaint: false,
-        proxy,
-        ...opts
-    });
-};
diff --git a/src/core/logger.ts b/src/core/logger.ts
index cebf7ca..f47980a 100644
--- a/src/core/logger.ts
+++ b/src/core/logger.ts
@@ -1,22 +1,31 @@
+export interface LoggerOptions {
+    id: string;
+    enabled: boolean;
+}
+
 export class Logger {
     static instances: {[key: string]: Logger} = {};
 
     private readonly id: string;
+    private readonly enabled: boolean;
     private readonly start: number;
 
-    constructor(id: string) {
+    constructor({id, enabled}: LoggerOptions) {
         this.id = id;
+        this.enabled = enabled;
         this.start = Date.now();
     }
 
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     debug(...args: any) {
-        // eslint-disable-next-line no-console
-        if (typeof window !== 'undefined' && window.console && typeof console.debug === 'function') {
+        if (this.enabled) {
             // eslint-disable-next-line no-console
-            console.debug(this.id, `${this.getTime()}ms`, ...args);
-        } else {
-            this.info(...args);
+            if (typeof window !== 'undefined' && window.console && typeof console.debug === 'function') {
+                // eslint-disable-next-line no-console
+                console.debug(this.id, `${this.getTime()}ms`, ...args);
+            } else {
+                this.info(...args);
+            }
         }
     }
 
@@ -24,8 +33,8 @@ export class Logger {
         return Date.now() - this.start;
     }
 
-    static create(id: string) {
-        Logger.instances[id] = new Logger(id);
+    static create(options: LoggerOptions) {
+        Logger.instances[options.id] = new Logger(options);
     }
 
     static destroy(id: string) {
@@ -42,21 +51,25 @@ export class Logger {
 
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     info(...args: any) {
-        // eslint-disable-next-line no-console
-        if (typeof window !== 'undefined' && window.console && typeof console.info === 'function') {
+        if (this.enabled) {
             // eslint-disable-next-line no-console
-            console.info(this.id, `${this.getTime()}ms`, ...args);
+            if (typeof window !== 'undefined' && window.console && typeof console.info === 'function') {
+                // eslint-disable-next-line no-console
+                console.info(this.id, `${this.getTime()}ms`, ...args);
+            }
         }
     }
 
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     error(...args: any) {
-        // eslint-disable-next-line no-console
-        if (typeof window !== 'undefined' && window.console && typeof console.error === 'function') {
+        if (this.enabled) {
             // eslint-disable-next-line no-console
-            console.error(this.id, `${this.getTime()}ms`, ...args);
-        } else {
-            this.info(...args);
+            if (typeof window !== 'undefined' && window.console && typeof console.error === 'function') {
+                // eslint-disable-next-line no-console
+                console.error(this.id, `${this.getTime()}ms`, ...args);
+            } else {
+                this.info(...args);
+            }
         }
     }
 }
diff --git a/src/css/property-descriptors/__tests__/background-tests.ts b/src/css/property-descriptors/__tests__/background-tests.ts
index 28f1ae0..552ee8c 100644
--- a/src/css/property-descriptors/__tests__/background-tests.ts
+++ b/src/css/property-descriptors/__tests__/background-tests.ts
@@ -4,15 +4,13 @@ import {backgroundImage} from '../background-image';
 import {CSSImageType} from '../../types/image';
 import {pack} from '../../types/color';
 import {deg} from '../../types/angle';
-import {createMockContext} from '../../../core/__tests__/mock-context';
-import {CacheStorage} from '../../../core/cache-storage';
+
+jest.mock('../../../core/cache-storage');
+jest.mock('../../../core/features');
 
 const backgroundImageParse = (value: string) => backgroundImage.parse(Parser.parseValues(value));
 
 describe('property-descriptors', () => {
-    before(() => {
-        CacheStorage.attachInstance(createMockContext('http://example.com'));
-    });
     describe('background-image', () => {
         it('none', () => deepStrictEqual(backgroundImageParse('none'), []));
 
diff --git a/src/css/types/__tests__/image-tests.ts b/src/css/types/__tests__/image-tests.ts
index 24a5d9e..9e3c067 100644
--- a/src/css/types/__tests__/image-tests.ts
+++ b/src/css/types/__tests__/image-tests.ts
@@ -8,6 +8,9 @@ import {deg} from '../angle';
 const parse = (value: string) => image.parse(Parser.parseValue(value));
 const colorParse = (value: string) => color.parse(Parser.parseValue(value));
 
+jest.mock('../../../core/cache-storage');
+jest.mock('../../../core/features');
+
 describe('types', () => {
     describe('<image>', () => {
         describe('parsing', () => {
diff --git a/src/index.ts b/src/index.ts
index 271f510..7e47073 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,7 +11,7 @@ import {ForeignObjectRenderer} from './render/canvas/foreignobject-renderer';
 export type Options = CloneOptions &
     RenderOptions &
     ResourceOptions & {
-        backgroundColor: string;
+        backgroundColor: string | null;
         foreignObjectRendering: boolean;
         logging: boolean;
         removeContainer?: boolean;
@@ -76,7 +76,7 @@ const renderElement = async (element: HTMLElement, opts: Partial<Options>): Prom
 
     const windowBounds = new Bounds(options.scrollX, options.scrollY, options.windowWidth, options.windowHeight);
 
-    Logger.create(instanceName);
+    Logger.create({id: instanceName, enabled: options.logging});
     Logger.getInstance(instanceName).debug(`Starting document clone`);
     const documentCloner = new DocumentCloner(element, {
         id: instanceName,
@@ -101,7 +101,8 @@ const renderElement = async (element: HTMLElement, opts: Partial<Options>): Prom
         : COLORS.TRANSPARENT;
 
     const bgColor = opts.backgroundColor;
-    const defaultBackgroundColor = typeof bgColor === 'string' ? parseColor(bgColor) : bgColor === null ? COLORS.TRANSPARENT : 0xffffffff;
+    const defaultBackgroundColor =
+        typeof bgColor === 'string' ? parseColor(bgColor) : bgColor === null ? COLORS.TRANSPARENT : 0xffffffff;
 
     const backgroundColor =
         element === ownerDocument.documentElement
diff --git a/src/render/canvas/canvas-renderer.ts b/src/render/canvas/canvas-renderer.ts
index 0196d3e..87303c1 100644
--- a/src/render/canvas/canvas-renderer.ts
+++ b/src/render/canvas/canvas-renderer.ts
@@ -578,10 +578,10 @@ export class CanvasRenderer {
 
                 ctx.fillStyle = gradient;
                 ctx.fillRect(0, 0, width, height);
-                if ((width > 0) && (height > 0)) {
-					const pattern = this.ctx.createPattern(canvas, 'repeat') as CanvasPattern;
-					this.renderRepeat(path, pattern, x, y);
-				}
+                if (width > 0 && height > 0) {
+                    const pattern = this.ctx.createPattern(canvas, 'repeat') as CanvasPattern;
+                    this.renderRepeat(path, pattern, x, y);
+                }
             } else if (isRadialGradient(backgroundImage)) {
                 const [path, left, top, width, height] = calculateBackgroundRendering(container, index, [
                     null,
diff --git a/tests/rollup.config.ts b/tests/rollup.config.ts
index 32509d0..58b40a6 100644
--- a/tests/rollup.config.ts
+++ b/tests/rollup.config.ts
@@ -36,7 +36,7 @@ export default {
         // Allow json resolution
         json(),
         // Compile TypeScript files
-        typescript({useTsconfigDeclarationDir: true}),
+        typescript({useTsconfigDeclarationDir: true, tsconfig: resolve(__dirname, 'tsconfig.json')}),
         // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
         commonjs({
             include: 'node_modules/**',
diff --git a/tests/tsconfig.json b/tests/tsconfig.json
new file mode 100644
index 0000000..168f060
--- /dev/null
+++ b/tests/tsconfig.json
@@ -0,0 +1,6 @@
+{
+    "extends": "../tsconfig.json",
+    "compilerOptions": {
+        "types": ["node", "mocha"]
+    }
+}
diff --git a/tsconfig.json b/tsconfig.json
index e314348..7d251ff 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,7 +7,7 @@
         "strictNullChecks": true,
         "strictPropertyInitialization": true,
         "resolveJsonModule": true,
-        "typeRoots": [ "./types", "./node_modules/@types"],
+        "types": ["node", "jest"],
         "target": "es5",
         "lib": ["es2015", "dom"],
         "sourceMap": true,
diff --git a/www/src/preview.ts b/www/src/preview.ts
index eb22f19..6d21d3b 100644
--- a/www/src/preview.ts
+++ b/www/src/preview.ts
@@ -42,6 +42,8 @@ function onBrowserChange(browserTest: Test) {
         previewImage.src = `/results/${browserTest.screenshot}.png`;
         if (browserTest.devicePixelRatio > 1) {
             previewImage.style.transform = `scale(${1 / browserTest.devicePixelRatio})`;
+        } else {
+            previewImage.style.transform = '';
         }
     }
 }