test: Add tests for Credential Types (#4078)

* test: Add tests for Credential Types

packages/cli/test/unit/CredentialTypes.test.ts

@@ -0,0 +1,61 @@
+import { CredentialTypes } from '../../src';
+import type { ICredentialTypeData, ICredentialTypes } from 'n8n-workflow';
+
+describe('ActiveExecutions', () => {
+
+	let credentialTypes: ICredentialTypes;
+
+	beforeEach(() => {
+		credentialTypes = CredentialTypes();
+	});
+
+	test('Should start with empty credential list', () => {
+		expect(credentialTypes.getAll()).toEqual([]);
+	});
+
+	test('Should initialize credential types', () => {
+		credentialTypes.init(mockCredentialTypes());
+		expect(credentialTypes.getAll()).toHaveLength(2);
+	});
+
+	test('Should return all credential types', () => {
+		credentialTypes.init(mockCredentialTypes());
+		const mockedCredentialTypes = mockCredentialTypes();
+		expect(credentialTypes.getAll()).toStrictEqual([
+			mockedCredentialTypes.fakeFirstCredential.type,
+			mockedCredentialTypes.fakeSecondCredential.type,
+		]);
+	});
+
+	test('Should throw error when calling invalid credential name', () => {
+		credentialTypes.init(mockCredentialTypes());
+		expect(() => credentialTypes.getByName('fakeThirdCredential')).toThrowError();
+	});
+
+	test('Should return correct credential type for valid name', () => {
+		credentialTypes.init(mockCredentialTypes());
+		const mockedCredentialTypes = mockCredentialTypes();
+		expect(credentialTypes.getByName('fakeFirstCredential')).toStrictEqual(mockedCredentialTypes.fakeFirstCredential.type);
+	});
+});
+
+function mockCredentialTypes(): ICredentialTypeData {
+	return {
+		fakeFirstCredential: {
+			type: {
+				name: 'fakeFirstCredential',
+				displayName: 'Fake First Credential',
+				properties: [],
+			},
+			sourcePath: '',
+		},
+		fakeSecondCredential: {
+			type: {
+				name: 'fakeSecondCredential',
+				displayName: 'Fake Second Credential',
+				properties: [],
+			},
+			sourcePath: '',
+		},
+	};
+}