diff --git a/npm/ng-packs/packages/core/src/lib/tests/common-utils.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/common-utils.spec.ts
index 60280e396b..359a521513 100644
--- a/npm/ng-packs/packages/core/src/lib/tests/common-utils.spec.ts
+++ b/npm/ng-packs/packages/core/src/lib/tests/common-utils.spec.ts
@@ -1,4 +1,12 @@
-import { isUndefinedOrEmptyString, noop } from '../utils';
+import {
+  isUndefinedOrEmptyString,
+  noop,
+  isNullOrUndefined,
+  exists,
+  isObject,
+  isArray,
+  isObjectAndNotArray,
+} from '../utils';
 
 describe('CommonUtils', () => {
   describe('#noop', () => {
@@ -8,7 +16,7 @@ describe('CommonUtils', () => {
     });
   });
 
-  describe('#isUndefinedOrEmptyString', () => {
+  describe('#isUndefinedOrEmptyString & #exists', () => {
     test.each`
       value        | expected
       ${null}      | ${false}
@@ -23,4 +31,88 @@ describe('CommonUtils', () => {
       expect(isUndefinedOrEmptyString(value)).toBe(expected);
     });
   });
+
+  describe('#isNullOrUndefined & #exists', () => {
+    test.each`
+      value        | expected
+      ${null}      | ${true}
+      ${undefined} | ${true}
+      ${true}      | ${false}
+      ${false}     | ${false}
+      ${''}        | ${false}
+      ${'test'}    | ${false}
+      ${0}         | ${false}
+      ${10}        | ${false}
+      ${[]}        | ${false}
+      ${[1, 2]}    | ${false}
+      ${{}}        | ${false}
+      ${{ a: 1 }}  | ${false}
+    `(
+      'should return $expected and !$expected (for #exists) when given parameter is $value',
+      ({ value, expected }) => {
+        expect(isNullOrUndefined(value)).toBe(expected);
+        expect(exists(value)).toBe(!expected);
+      },
+    );
+  });
+
+  describe('#isObject', () => {
+    test.each`
+      value        | expected
+      ${null}      | ${false}
+      ${undefined} | ${false}
+      ${true}      | ${false}
+      ${false}     | ${false}
+      ${''}        | ${false}
+      ${'test'}    | ${false}
+      ${0}         | ${false}
+      ${10}        | ${false}
+      ${[]}        | ${true}
+      ${[1, 2]}    | ${true}
+      ${{}}        | ${true}
+      ${{ a: 1 }}  | ${true}
+    `('should return $expected when given parameter is $value', ({ value, expected }) => {
+      expect(isObject(value)).toBe(expected);
+    });
+  });
+
+  describe('#isArray', () => {
+    test.each`
+      value        | expected
+      ${null}      | ${false}
+      ${undefined} | ${false}
+      ${true}      | ${false}
+      ${false}     | ${false}
+      ${''}        | ${false}
+      ${'test'}    | ${false}
+      ${0}         | ${false}
+      ${10}        | ${false}
+      ${[]}        | ${true}
+      ${[1, 2]}    | ${true}
+      ${{}}        | ${false}
+      ${{ a: 1 }}  | ${false}
+    `('should return $expected when given parameter is $value', ({ value, expected }) => {
+      expect(isArray(value)).toBe(expected);
+    });
+  });
+
+  describe('#isObjectAndNotArray', () => {
+    test.each`
+      value        | expected
+      ${null}      | ${false}
+      ${undefined} | ${false}
+      ${true}      | ${false}
+      ${false}     | ${false}
+      ${''}        | ${false}
+      ${'test'}    | ${false}
+      ${0}         | ${false}
+      ${10}        | ${false}
+      ${[]}        | ${false}
+      ${[1, 2]}    | ${false}
+      ${{}}        | ${true}
+      ${{ a: 1 }}  | ${true}
+    `('should return $expected when given parameter is $value', ({ value, expected }) => {
+      expect(isObjectAndNotArray(value)).toBe(expected);
+    });
+  });
 });