diff --git a/.gitignore b/.gitignore
index 7a1537ba..57beb2c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .idea
 node_modules
+coverage/
diff --git a/src/model/error/validation-error.test.js b/src/model/error/validation-error.test.js
new file mode 100644
index 00000000..5b054800
--- /dev/null
+++ b/src/model/error/validation-error.test.js
@@ -0,0 +1,14 @@
+import ValidationError from './validation-error';
+
+describe('ValidationError', () => {
+  it('instantiates', () => {
+    expect(() => new ValidationError()).not.toThrow();
+  });
+
+  test.each([1, 'one', { name: '!' }])('Displays title %s', message => {
+    const error = new ValidationError(message);
+
+    expect(error.name).toStrictEqual('ValidationError');
+    expect(error.message).toStrictEqual(message.toString());
+  });
+});
diff --git a/src/model/index.test.js b/src/model/index.test.js
index 188fe50e..bd5fcbb5 100644
--- a/src/model/index.test.js
+++ b/src/model/index.test.js
@@ -6,8 +6,8 @@ describe('Index', () => {
     'BuildParameters',
     'Cache',
     'Docker',
-    'Input',
     'ImageTag',
+    'Input',
     'Platform',
     'Project',
     'Unity',