diff --git a/src/types/config.ts b/src/types/config.ts
index 6517e81..739d688 100644
--- a/src/types/config.ts
+++ b/src/types/config.ts
@@ -73,8 +73,8 @@ export const defaultConfig: Config = {
             icon: "code",
 
             packageManager: "auto",
-            packageName: undefined,
             packageGlobal: false,
+            packageName: undefined,
 
             title: undefined,
             description: undefined,
diff --git a/tests/fixtures/configs/preview.yml b/tests/fixtures/configs/preview.yml
new file mode 100644
index 0000000..daf43f2
--- /dev/null
+++ b/tests/fixtures/configs/preview.yml
@@ -0,0 +1,37 @@
+path:
+    readme: 'README-foo.md'
+
+image:
+    url: 'https://example.com/image.png'
+    parameters:
+        pattern: 'cage'
+        style: 'style_1'
+        fontSize: '123px'
+        icon: 'cog'
+        
+        packageManager: 'yarn'
+        packageGlobal: true
+        packageName: 'foo/bar'
+        
+        title: 'Foo Bar'
+        description: 'Lorem ipsum dolor sit amet.'
+
+repository:
+    commit:
+        branch: 'qwerty'
+        title: 'Foo Bar Commit'
+        body: 'Eu assum suscipit, vel veniam eu sadipscing kasd invidunt elit wisi.'
+        
+        author:
+            name: 'some_username'
+            email: 'some_username@example.com'
+    
+    pullRequest:
+        title: 'Foo Bar Baz Pull Request'
+        body: 'Eu assum suscipit, vel veniam eu sadipscing kasd invidunt elit wisi.'
+        assignees:
+            - foo1
+            - foo2
+        labels:
+            - foo3
+            - foo4
diff --git a/tests/unit/filesystem.test.ts b/tests/unit/filesystem.test.ts
index dc7069b..6367afe 100644
--- a/tests/unit/filesystem.test.ts
+++ b/tests/unit/filesystem.test.ts
@@ -1,27 +1,66 @@
-import { rawTestConfig } from "../helpers/config";
-import { type Config, defaultConfig } from "../../src/types/config";
-import { readConfig } from "../../src/utils/filesystem";
-import { CONFIG_PATH } from "../../src/utils/inputs";
+import { rawTestConfig } from '../helpers/config'
+import { type Config, defaultConfig } from '../../src/types/config'
+import { readConfig } from '../../src/utils/filesystem'
+import { CONFIG_PATH } from '../../src/utils/inputs'
 
-test("read config", () => {
-    const data: Config = readConfig(rawTestConfig, CONFIG_PATH.defaultValue);
+test('read config', () => {
+    const data: Config = readConfig(rawTestConfig, CONFIG_PATH.defaultValue)
 
-    expect(data.directory).toBe(process.cwd());
+    expect(data.directory).toBe(process.cwd())
 
     expect(data.image.parameters.packageName).toBe(
-        "TheDragonCode/preview-updater",
-    );
-    expect(data.image.parameters.title).toBe("Preview Updater");
+        'TheDragonCode/preview-updater'
+    )
+    expect(data.image.parameters.title).toBe('Preview Updater')
     expect(data.image.parameters.description).toBe(
-        "Lightweight preview update in your repository",
-    );
+        'Lightweight preview update in your repository'
+    )
 
-    expect(data.path.readme).toBe(defaultConfig.path.readme);
-    expect(data.image.url).toBe(defaultConfig.image.url);
+    expect(data.path.readme).toBe(defaultConfig.path.readme)
+    expect(data.image.url).toBe(defaultConfig.image.url)
     expect(data.image.parameters.pattern).toBe(
-        defaultConfig.image.parameters.pattern,
-    );
+        defaultConfig.image.parameters.pattern
+    )
 
-    expect(data.image.parameters.packageManager).toBe("none");
-    expect(data.image.parameters.icon).toBe("photograph");
-});
+    expect(data.image.parameters.packageManager).toBe('none')
+    expect(data.image.parameters.icon).toBe('photograph')
+})
+
+test('custom config', () => {
+    const data: Config = readConfig(<Config>{
+        directory: process.cwd()
+    }, 'tests/fixtures/configs/preview.yml')
+
+    expect(data.path.readme).toBe('README-foo.md')
+
+    expect(data.image.url).toBe('https://example.com/image.png')
+    expect(data.image.parameters.pattern).toBe('cage')
+    expect(data.image.parameters.style).toBe('style_1')
+
+    expect(data.image.parameters.fontSize).toBe('123px')
+    expect(data.image.parameters.icon).toBe('cog')
+
+    expect(data.image.parameters.packageManager).toBe('yarn')
+    expect(data.image.parameters.packageGlobal).toBe(true)
+    expect(data.image.parameters.packageName).toBe('foo/bar')
+
+    expect(data.image.parameters.title).toBe('Foo Bar')
+    expect(data.image.parameters.description).toBe('Lorem ipsum dolor sit amet.')
+
+    expect(data.repository.commit.branch).toBe('qwerty')
+    expect(data.repository.commit.title).toBe('Foo Bar Commit')
+    expect(data.repository.commit.body).toBe('Eu assum suscipit, vel veniam eu sadipscing kasd invidunt elit wisi.')
+
+    expect(data.repository.commit.author.name).toBe('some_username')
+    expect(data.repository.commit.author.email).toBe('some_username@example.com')
+
+    expect(data.repository.pullRequest.title).toBe('Foo Bar Baz Pull Request')
+    expect(data.repository.pullRequest.body).toBe('Eu assum suscipit, vel veniam eu sadipscing kasd invidunt elit wisi.')
+
+    expect(data.repository.pullRequest.assignees.length).toBe(2)
+    expect(data.repository.pullRequest.assignees.join('-')).toBe('foo1-foo2')
+
+    expect(data.repository.pullRequest.labels.length).toBe(2)
+    expect(data.repository.pullRequest.labels.join('-')).toBe('foo3-foo4')
+
+})