diff --git a/deno-runtime/handlers/tests/slashcommand-handler.test.ts b/deno-runtime/handlers/tests/slashcommand-handler.test.ts
new file mode 100644
index 000000000..40fb5a397
--- /dev/null
+++ b/deno-runtime/handlers/tests/slashcommand-handler.test.ts
@@ -0,0 +1,155 @@
+// deno-lint-ignore-file no-explicit-any
+import { assertInstanceOf, assertEquals } from 'https://deno.land/std@0.203.0/assert/mod.ts';
+import { beforeEach, describe, it } from 'https://deno.land/std@0.203.0/testing/bdd.ts';
+import { spy } from "https://deno.land/std@0.203.0/testing/mock.ts";
+import { Room as _Room } from '@rocket.chat/apps-engine/server/rooms/Room.ts';
+
+import { AppObjectRegistry } from '../../AppObjectRegistry.ts';
+import { AppAccessors } from '../../lib/accessors/mod.ts';
+import { handleExecutor, handlePreviewItem } from '../slashcommand-handler.ts';
+import { require } from '../../lib/require.ts';
+
+const { Room } = require('@rocket.chat/apps-engine/server/rooms/Room.js') as { Room: typeof _Room } ;
+
+describe('handlers > slashcommand', () => {
+    const mockAppAccessors = {
+        getReader: () => ({ __type: 'reader' }),
+        getHttp: () => ({ __type: 'http' }),
+        getModifier: () => ({ __type: 'modifier' }),
+        getPersistence: () => ({ __type: 'persistence' }),
+        getSenderFn: () => (id: string) => Promise.resolve([{ __type: 'bridgeCall' }, { id }]),
+    } as unknown as AppAccessors;
+
+    const mockCommandExecutorOnly = {
+        command: 'executor-only',
+        i18nParamsExample: 'test',
+        i18nDescription: 'test',
+        providesPreview: false,
+        // deno-lint-ignore no-unused-vars
+        async executor(context: any, read: any, modify: any, http: any, persis: any): Promise<void> {},
+    };
+
+    const mockCommandExecutorAndPreview = {
+        command: 'executor-and-preview',
+        i18nParamsExample: 'test',
+        i18nDescription: 'test',
+        providesPreview: true,
+        // deno-lint-ignore no-unused-vars
+        async executor(context: any, read: any, modify: any, http: any, persis: any): Promise<void> {},
+        // deno-lint-ignore no-unused-vars
+        async previewer(context: any, read: any, modify: any, http: any, persis: any): Promise<void> {},
+        // deno-lint-ignore no-unused-vars
+        async executePreviewItem(previewItem: any,context: any, read: any, modify: any, http: any, persis: any): Promise<void> {},
+    };
+
+    const mockCommandPreviewWithNoExecutor = {
+        command: 'preview-with-no-executor',
+        i18nParamsExample: 'test',
+        i18nDescription: 'test',
+        providesPreview: true,
+        // deno-lint-ignore no-unused-vars
+        async previewer(context: any, read: any, modify: any, http: any, persis: any): Promise<void> {},
+        // deno-lint-ignore no-unused-vars
+        async executePreviewItem(previewItem: any,context: any, read: any, modify: any, http: any, persis: any): Promise<void> {},
+    };
+
+    beforeEach(() => {
+        AppObjectRegistry.clear();
+        AppObjectRegistry.set('slashcommand:executor-only', mockCommandExecutorOnly);
+        AppObjectRegistry.set('slashcommand:executor-and-preview', mockCommandExecutorAndPreview);
+        AppObjectRegistry.set('slashcommand:preview-with-no-executor', mockCommandPreviewWithNoExecutor);
+    });
+
+    it('correctly handles execution of a slash command', async () => {
+        const mockContext = {
+            sender: { __type: 'sender' },
+            room: { __type: 'room' },
+            params: { __type: 'params' },
+            threadId: 'threadId',
+            triggerId: 'triggerId',
+        };
+
+        const _spy = spy(mockCommandExecutorOnly, 'executor');
+
+        await handleExecutor({ AppAccessorsInstance: mockAppAccessors }, mockCommandExecutorOnly, 'executor', [mockContext]);
+
+        const context = _spy.calls[0].args[0];
+
+        assertInstanceOf(context.getRoom(), Room);
+        assertEquals(context.getSender(), { __type: 'sender' });
+        assertEquals(context.getArguments(), { __type: 'params' });
+        assertEquals(context.getThreadId(), 'threadId');
+        assertEquals(context.getTriggerId(), 'triggerId');
+
+        assertEquals(_spy.calls[0].args[1], mockAppAccessors.getReader());
+        assertEquals(_spy.calls[0].args[2], mockAppAccessors.getModifier());
+        assertEquals(_spy.calls[0].args[3], mockAppAccessors.getHttp());
+        assertEquals(_spy.calls[0].args[4], mockAppAccessors.getPersistence());
+
+        _spy.restore();
+    });
+
+    it('correctly handles execution of a slash command previewer', async () => {
+        const mockContext = {
+            sender: { __type: 'sender' },
+            room: { __type: 'room' },
+            params: { __type: 'params' },
+            threadId: 'threadId',
+            triggerId: 'triggerId',
+        };
+
+        const _spy = spy(mockCommandExecutorAndPreview, 'previewer');
+
+        await handleExecutor({ AppAccessorsInstance: mockAppAccessors }, mockCommandExecutorAndPreview, 'previewer', [mockContext]);
+
+        const context = _spy.calls[0].args[0];
+
+        assertInstanceOf(context.getRoom(), Room);
+        assertEquals(context.getSender(), { __type: 'sender' });
+        assertEquals(context.getArguments(), { __type: 'params' });
+        assertEquals(context.getThreadId(), 'threadId');
+        assertEquals(context.getTriggerId(), 'triggerId');
+
+        assertEquals(_spy.calls[0].args[1], mockAppAccessors.getReader());
+        assertEquals(_spy.calls[0].args[2], mockAppAccessors.getModifier());
+        assertEquals(_spy.calls[0].args[3], mockAppAccessors.getHttp());
+        assertEquals(_spy.calls[0].args[4], mockAppAccessors.getPersistence());
+
+        _spy.restore();
+    });
+
+    it('correctly handles execution of a slash command preview item executor', async () => {
+        const mockContext = {
+            sender: { __type: 'sender' },
+            room: { __type: 'room' },
+            params: { __type: 'params' },
+            threadId: 'threadId',
+            triggerId: 'triggerId',
+        };
+
+        const mockPreviewItem = {
+            id: 'previewItemId',
+            type: 'image',
+            value: 'https://example.com/image.png',
+        };
+
+        const _spy = spy(mockCommandExecutorAndPreview, 'executePreviewItem');
+
+        await handlePreviewItem({ AppAccessorsInstance: mockAppAccessors }, mockCommandExecutorAndPreview, [mockPreviewItem, mockContext]);
+
+        const context = _spy.calls[0].args[1];
+
+        assertInstanceOf(context.getRoom(), Room);
+        assertEquals(context.getSender(), { __type: 'sender' });
+        assertEquals(context.getArguments(), { __type: 'params' });
+        assertEquals(context.getThreadId(), 'threadId');
+        assertEquals(context.getTriggerId(), 'triggerId');
+
+        assertEquals(_spy.calls[0].args[2], mockAppAccessors.getReader());
+        assertEquals(_spy.calls[0].args[3], mockAppAccessors.getModifier());
+        assertEquals(_spy.calls[0].args[4], mockAppAccessors.getHttp());
+        assertEquals(_spy.calls[0].args[5], mockAppAccessors.getPersistence());
+
+        _spy.restore();
+    });
+});