diff --git a/.changeset/config.json b/.changeset/config.json
index b1050a4..286a217 100644
--- a/.changeset/config.json
+++ b/.changeset/config.json
@@ -4,7 +4,7 @@
   "commit": false,
   "linked": [],
   "access": "restricted",
-  "baseBranch": "master",
+  "baseBranch": "main",
   "updateInternalDependencies": "patch",
   "ignore": []
-}
\ No newline at end of file
+}
diff --git a/.changeset/tiny-sloths-flash.md b/.changeset/tiny-sloths-flash.md
new file mode 100644
index 0000000..d19e6a8
--- /dev/null
+++ b/.changeset/tiny-sloths-flash.md
@@ -0,0 +1,5 @@
+---
+'ts-japi': patch
+---
+
+Fixes the test framework
diff --git a/package.json b/package.json
index f6ed55e..abdb88d 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "A highly-modular (typescript-friendly)-framework agnostic library for serializing data to the JSON:API specification",
   "main": "lib/index.js",
   "scripts": {
-    "test": " jest --runInBand --verbose --coverage",
+    "test": "jest --runInBand --verbose --coverage",
     "playground": "ts-node ./benchmarks/playground.benchmark",
     "lint": "eslint .",
     "examples": "ts-node ./examples/",
diff --git a/src/models/error.model.ts b/src/models/error.model.ts
index 9ec4000..42ee66c 100644
--- a/src/models/error.model.ts
+++ b/src/models/error.model.ts
@@ -1,30 +1,37 @@
 import { Dictionary, nullish } from '..';
 import { ErrorOptions } from '../interfaces/error.interface';
+import { isObject } from '../utils/is-object';
 import Link from './link.model';
 import Meta from './meta.model';
-import { isObject } from '../utils/is-object';
 
 export default class JapiError {
   /**
    * Tests whether `error` has similar attributes to a JapiError
    *
-   * @param error - An unknown object
+   * @param error An unknown object
    */
   public static isLikeJapiError(error: unknown): error is Partial<JapiError> {
+    console.log(!isObject(error));
     if (!isObject(error)) return false;
-    return (
-      ['id', 'status', 'code', 'title', 'detail', 'source', 'links', 'meta'].some(
-        (attrName) => attrName in error
-      ) &&
-      [
-        (['id', 'status', 'code', 'title', 'detail'] as const).every(
-          (attrName) => !(attrName in error) || typeof error[attrName] === 'string'
-        ),
-        (['source', 'links', 'meta'] as const).every(
-          (attrName) => !(attrName in error) || isObject(error[attrName])
-        ),
-      ].every((v) => v)
+    const hasErrorKeys = [
+      'id',
+      'status',
+      'code',
+      'title',
+      'detail',
+      'source',
+      'links',
+      'meta',
+    ].some((attrName) => attrName in error);
+    const expectedStringKeys = (['id', 'status', 'code', 'title', 'detail'] as const).every(
+      (attrName) =>
+        !(attrName in error) || error[attrName] === undefined || typeof error[attrName] === 'string'
+    );
+    const expectedObjectKeys = (['source', 'links', 'meta'] as const).every(
+      (attrName) =>
+        !(attrName in error) || error[attrName] === undefined || isObject(error[attrName])
     );
+    return hasErrorKeys && [expectedStringKeys, expectedObjectKeys].every((v) => v);
   }
 
   /** @internal */
diff --git a/test/utils/model-factory.ts b/test/utils/model-factory.ts
index 1289fee..ca3158f 100644
--- a/test/utils/model-factory.ts
+++ b/test/utils/model-factory.ts
@@ -1,70 +1,74 @@
-import { findAllExisting } from "./find-all-existing";
-import { capitalize, camelCase } from "lodash";
-import { pushIfNotExists } from "./push-if-not-exists";
-import Base from "../models/base.model";
+import { camelCase, capitalize } from 'lodash';
+import Base from '../models/base.model';
+import { findAllExisting } from './find-all-existing';
+import { pushIfNotExists } from './push-if-not-exists';
 
 const ModelFactory = {
- addArrayAttribute<T extends typeof Base, U extends typeof Base>(
-  name: string,
-  target: T,
-  source: U
- ) {
-  const getterName = `get${capitalize(camelCase(name))}`;
-  target.afterRemoveHook = target.afterRemoveHook ?? [];
-  target.beforeSaveHook = target.beforeSaveHook ?? [];
-  target.prototype = target.prototype ?? ({} as any);
-  (target.prototype as any)[getterName] = function <Target>(this: Target) {
-   return findAllExisting((this as any)[name], (id: string) => source.find(id));
-  };
-  target.afterRemoveHook.push(<Target, Source extends Base>(model: Target) => {
-   (model as any)[getterName]().map((m: Source) => source.remove(m));
-  });
-  target.beforeSaveHook.push(<Target>(model: Target) => {
-   findAllExisting((model as any)[name], (id: string) => source.find(id));
-  });
- },
- addSingleAttribute<T extends typeof Base, U extends typeof Base>(
-  name: string,
-  othername: string,
-  target: T,
-  source: U
- ) {
-  const getterName = `get${capitalize(camelCase(name))}`;
-  target.beforeSaveHook = target.beforeSaveHook ?? [];
-  target.prototype = target.prototype ?? ({} as any);
-  (target.prototype as any)[getterName] = function <Target>(this: Target) {
-   return source.find((this as any)[name]);
-  };
-  target.beforeSaveHook.push(<Target extends Base>(model: Target) => {
-   const sourceModel = (model as any)[getterName]();
-   if (!sourceModel) throw new Error(`no ${name}`);
-   pushIfNotExists(sourceModel[othername], model.id, (id) => id === model.id);
-  });
- },
- createModel<T extends typeof Base>(model: T) {
-  model.storage = [];
-  model.find = function (this: T, id: string) {
-   if (this.beforeFindHook) this.beforeFindHook.forEach((hook) => hook(id));
-   const result = this.storage.find((u) => u.id === id);
-   if (this.afterFindHook) this.afterFindHook.forEach((hook) => hook(id));
-   return result;
-  };
-  model.remove = function <U extends Base>(this: T, obj: U) {
-   if (this.beforeRemoveHook) this.beforeRemoveHook.forEach((hook) => hook(obj));
-   let idx = this.storage.findIndex((u) => u.id === obj.id);
-   if (typeof idx === "number") {
-    delete this.storage[idx];
-   }
-   if (this.afterRemoveHook) this.afterRemoveHook.forEach((hook) => hook(obj));
-   return obj;
-  };
-  model.save = function <U extends Base>(this: T, model: U) {
-   if (this.beforeSaveHook) this.beforeSaveHook.forEach((hook) => hook(model));
-   pushIfNotExists(this.storage, model, (m) => m.id === model.id);
-   if (this.afterSaveHook) this.afterSaveHook.forEach((hook) => hook(model));
-   return model;
-  };
- },
+  addArrayAttribute<T extends typeof Base, U extends typeof Base>(
+    name: string,
+    target: T,
+    source: U
+  ) {
+    const getterName = `get${capitalize(camelCase(name))}`;
+    target.afterRemoveHook = target.afterRemoveHook ?? [];
+    target.beforeSaveHook = target.beforeSaveHook ?? [];
+    if (!target.prototype) {
+      target.prototype = {} as any;
+    }
+    (target.prototype as any)[getterName] = function <Target>(this: Target) {
+      return findAllExisting((this as any)[name], (id: string) => source.find(id));
+    };
+    target.afterRemoveHook.push(<Target, Source extends Base>(model: Target) => {
+      (model as any)[getterName]().map((m: Source) => source.remove(m));
+    });
+    target.beforeSaveHook.push(<Target>(model: Target) => {
+      findAllExisting((model as any)[name], (id: string) => source.find(id));
+    });
+  },
+  addSingleAttribute<T extends typeof Base, U extends typeof Base>(
+    name: string,
+    othername: string,
+    target: T,
+    source: U
+  ) {
+    const getterName = `get${capitalize(camelCase(name))}`;
+    target.beforeSaveHook = target.beforeSaveHook ?? [];
+    if (!target.prototype) {
+      target.prototype = {} as any;
+    }
+    (target.prototype as any)[getterName] = function <Target>(this: Target) {
+      return source.find((this as any)[name]);
+    };
+    target.beforeSaveHook.push(<Target extends Base>(model: Target) => {
+      const sourceModel = (model as any)[getterName]();
+      if (!sourceModel) throw new Error(`no ${name}`);
+      pushIfNotExists(sourceModel[othername], model.id, (id) => id === model.id);
+    });
+  },
+  createModel<T extends typeof Base>(model: T) {
+    model.storage = [];
+    model.find = function (this: T, id: string) {
+      if (this.beforeFindHook) this.beforeFindHook.forEach((hook) => hook(id));
+      const result = this.storage.find((u) => u.id === id);
+      if (this.afterFindHook) this.afterFindHook.forEach((hook) => hook(id));
+      return result;
+    };
+    model.remove = function <U extends Base>(this: T, obj: U) {
+      if (this.beforeRemoveHook) this.beforeRemoveHook.forEach((hook) => hook(obj));
+      let idx = this.storage.findIndex((u) => u.id === obj.id);
+      if (typeof idx === 'number') {
+        delete this.storage[idx];
+      }
+      if (this.afterRemoveHook) this.afterRemoveHook.forEach((hook) => hook(obj));
+      return obj;
+    };
+    model.save = function <U extends Base>(this: T, model: U) {
+      if (this.beforeSaveHook) this.beforeSaveHook.forEach((hook) => hook(model));
+      pushIfNotExists(this.storage, model, (m) => m.id === model.id);
+      if (this.afterSaveHook) this.afterSaveHook.forEach((hook) => hook(model));
+      return model;
+    };
+  },
 };
 
 export default ModelFactory;