test: add tests (#894)

2 files changed, 12 insertions, 2 deletions

diff --git a/src/helpers.ts b/src/helpers.ts
index 29b62a51..0d8ce5b0 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -716,7 +716,7 @@ export class Helpers {
   }
 
   /**
-   * Returns a random key from given object.
+   * Returns a random key from given object or `undefined` if no key could be found.
    *
    * @param object The object to be used.
    *
@@ -729,7 +729,7 @@ export class Helpers {
   }
 
   /**
-   * Returns a random value from given object.
+   * Returns a random value from given object or `undefined` if no key could be found.
    *
    * @param object The object to be used.
    *
diff --git a/test/helpers.spec.ts b/test/helpers.spec.ts
index a34886dd..e436e6dc 100644
--- a/test/helpers.spec.ts
+++ b/test/helpers.spec.ts
@@ -888,6 +888,11 @@ describe('helpers', () => {
 
           expect(Object.keys(testObject)).toContain(actual);
         });
+
+        it('should return undefined if given object is empty', () => {
+          const actual = faker.helpers.objectKey({});
+          expect(actual).toBeUndefined();
+        });
       });
 
       describe('objectValue', () => {
@@ -901,6 +906,11 @@ describe('helpers', () => {
 
           expect(Object.values(testObject)).toContain(actual);
         });
+
+        it('should return undefined if given object is empty', () => {
+          const actual = faker.helpers.objectValue({});
+          expect(actual).toBeUndefined();
+        });
       });
 
       describe('deprecation warnings', () => {