From ca696eb063c3e784cb49af3ca1cdf0527399f21c Mon Sep 17 00:00:00 2001
From: Vadim <korobeinikovv@mail.ru>
Date: Wed, 30 Jun 2021 23:36:38 +0300
Subject: [PATCH] Add unit tests for get

---
 src/utils/object.test.js | 65 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 src/utils/object.test.js

diff --git a/src/utils/object.test.js b/src/utils/object.test.js
new file mode 100644
index 0000000..1cf902f
--- /dev/null
+++ b/src/utils/object.test.js
@@ -0,0 +1,65 @@
+import {
+  get,
+} from './object.js'
+
+describe('get', () => {
+  it('returns correct value if field exists', () => {
+    const object = {
+      field: 5,
+    }
+    const fieldName = 'field'
+    const defaultValue = 10
+
+    expect(get(object, fieldName, defaultValue)).toBe(5)
+  })
+
+  it('returns correct value if field exists and has falsy value 0', () => {
+    const object = {
+      field: 0,
+    }
+    const fieldName = 'field'
+    const defaultValue = 10
+
+    expect(get(object, fieldName, defaultValue)).toBe(0)
+  })
+
+  it('returns correct value if field exists and has falsy value null', () => {
+    const object = {
+      field: null,
+    }
+    const fieldName = 'field'
+    const defaultValue = 10
+
+    expect(get(object, fieldName, defaultValue)).toBe(null)
+  })
+
+  it('returns default value if is provided and field does not exist', () => {
+    const object = {
+      field: 5,
+    }
+    const fieldName = 'nonExistingField'
+    const defaultValue = 10
+
+    expect(get(object, fieldName, defaultValue)).toBe(10)
+  })
+
+  it('returns correct value if field exists and has falsy value undefined', () => {
+    const object = {
+      field: undefined,
+    }
+    const fieldName = 'field'
+    const defaultValue = 10
+
+    expect(get(object, fieldName, defaultValue)).toBe(undefined)
+  })
+
+  it('throws an error if there is no field and no default value', () => {
+    const object = {
+      field: 'value',
+    }
+    const fieldName = 'nonExistingField'
+    expect(
+      () => get(object, fieldName)
+    ).toThrowError('Required arg "nonExistingField" was not provided')
+  })
+})