test(get): add tests for get function

tests/get.test.js

@@ -0,0 +1,44 @@
+import get from '../src/get';
+
+describe('get', () => {
+  test('should return the default value (undefined) if the object specified isn\'t an object', () => {
+    const got = get('test');
+
+    expect(got).toBeUndefined();
+  });
+
+  test('should return the default value (undefined) if the object specified is empty', () => {
+    const got = get({});
+
+    expect(got).toBeUndefined();
+  });
+
+  test('should return the default value when the object doesn\'t have the path specified', () => {
+    const a = {
+      a: 1,
+    };
+    const got = get(a, 'b');
+
+    expect(got).toBeUndefined();
+  });
+
+  test('should return the specified default value', () => {
+    const a = {
+      a: 1,
+    };
+    const got = get(a, 'b', 'default');
+
+    expect(got).toBe('default');
+  });
+
+  test('should return the specified default value when the path is dot notation', () => {
+    const a = {
+      a: {
+        b: 1,
+      },
+    };
+    const got = get(a, 'a.b');
+
+    expect(got).toBe(1);
+  });
+});