Add more and unify tests for absent object cases

- Unify test data for nonexistence of an object/string and collection.
- Introduce more test through adding missing test data to existing tests.
- Improve logic for checking absence of values to match tests.
- Add missing tests for absent value validation.
- Update documentation to include shared test functionality.

tests/unit/application/Context/ApplicationContextFactory.spec.ts

@@ -8,6 +8,7 @@ import { IApplication } from '@/domain/IApplication';
 import { EnvironmentStub } from '@tests/unit/stubs/EnvironmentStub';
 import { ApplicationStub } from '@tests/unit/stubs/ApplicationStub';
 import { CategoryCollectionStub } from '@tests/unit/stubs/CategoryCollectionStub';
+import { expectThrowsAsync } from '@tests/unit/shared/Assertions/ExpectThrowsAsync';
 
 describe('ApplicationContextFactory', () => {
   describe('buildContext', () => {
@@ -23,6 +24,15 @@ describe('ApplicationContextFactory', () => {
         // assert
         expect(expected).to.equal(context.app);
       });
+      it('throws when null', async () => {
+        // arrange
+        const expectedError = 'missing factory';
+        const factory = null;
+        // act
+        const act = async () => { await buildContext(factory); };
+        // assert
+        expectThrowsAsync(act, expectedError);
+      });
     });
     describe('environment', () => {
       describe('sets initial OS as expected', () => {
@@ -69,6 +79,16 @@ describe('ApplicationContextFactory', () => {
           expect(expectedOs).to.equal(actual, `Expected: ${OperatingSystem[expectedOs]}, actual: ${OperatingSystem[actual]}`);
         });
       });
+      it('throws when null', async () => {
+        // arrange
+        const expectedError = 'missing environment';
+        const factory = mockFactoryWithApp(undefined);
+        const environment = null;
+        // act
+        const act = async () => { await buildContext(factory, environment); };
+        // assert
+        expectThrowsAsync(act, expectedError);
+      });
     });
   });
 });