Added unit tests for snippets

ghost/ghost/src/core/snippets/snippet.entity.test.ts

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+import assert from 'assert';
+import {describe, it} from 'mocha';
+import {Snippet} from './snippet.entity';
+
+describe('Snippet Entity', () => {
+    let snippet: Snippet;
+
+    beforeEach(() => {
+        snippet = Snippet.create({
+            name: 'Test Snippet',
+            lexical: 'Test Lexical',
+            mobiledoc: 'Test Mobiledoc'
+        });
+    });
+
+    it('should create a snippet', () => {
+        assert(snippet instanceof Snippet);
+        assert.strictEqual(snippet.name, 'Test Snippet');
+        assert.strictEqual(snippet.lexical, 'Test Lexical');
+        assert.strictEqual(snippet.mobiledoc, 'Test Mobiledoc');
+    });
+
+    it('should update snippet name', () => {
+        snippet.name = 'Updated Snippet';
+        assert.strictEqual(snippet.name, 'Updated Snippet');
+    });
+
+    it('should update snippet lexical', () => {
+        snippet.lexical = 'Updated Lexical';
+        assert.strictEqual(snippet.lexical, 'Updated Lexical');
+    });
+
+    it('should update snippet mobiledoc', () => {
+        snippet.mobiledoc = 'Updated Mobiledoc';
+        assert.strictEqual(snippet.mobiledoc, 'Updated Mobiledoc');
+    });
+});

ghost/ghost/src/core/snippets/snippets.service.test.ts

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+import assert from 'assert';
+import {SnippetsService} from './snippets.service';
+import {SnippetsRepositoryInMemory} from '../../db/in-memory/snippets.repository.inmemory';
+
+describe('SnippetService', () => {
+    it('Can do some basic service stuff', async () => {
+        const repository = new SnippetsRepositoryInMemory();
+        const service = new SnippetsService(repository);
+
+        const snippet = await service.create({
+            name: 'Test Snippet',
+            lexical: '',
+            mobiledoc: '{}'
+        });
+
+        const allSnippets = await service.getAll({});
+
+        assert(allSnippets[0].name === snippet.name);
+
+        const updated = await service.update(snippet.id, {
+            name: 'Updated Name'
+        });
+
+        assert(updated);
+
+        const pageOfSnippets = await service.getPage({
+            page: 1,
+            limit: 10
+        });
+
+        assert(pageOfSnippets.data[0].name === updated.name);
+
+        await service.delete(snippet.id);
+
+        const notFound = await service.getOne(snippet.id);
+
+        assert(notFound === null);
+    });
+});