jest test suite for js/macros.js (#4359)

* created test file for macros.js

* Exporting modules for test

Author: omsuneri

js/__tests__/macros.test.js

@@ -0,0 +1,44 @@
+const blockIsMacro = require("../macros");
+const getMacroExpansion = require("../macros");
+global._ = jest.fn((str) => str); 
+
+describe('blockIsMacro', () => {
+    let mockActivity;
+
+    beforeEach(() => {
+        mockActivity = { blocks: { protoBlockDict: Object.create(null) } };
+    });
+    
+    test('should return true if block is in BLOCKISMACRO list', () => {
+        expect(Boolean(blockIsMacro(mockActivity, 'actionhelp'))).toBe(true);
+    });
+
+    test('should return false if block is neither in protoBlockDict nor BLOCKISMACRO', () => {
+        expect(Boolean(blockIsMacro(mockActivity, 'nonExistentBlock'))).toBe(false);
+    });
+});
+
+describe('getMacroExpansion', () => {
+    let mockActivity;
+
+    beforeEach(() => {
+        mockActivity = { blocks: { protoBlockDict: {} } };
+    });
+
+    test('should return macro expansion from protoBlockDict if macroFunc exists', () => {
+        const mockFunc = jest.fn(() => [['mockedExpansion']]);
+        mockActivity.blocks.protoBlockDict['customMacro'] = { macroFunc: mockFunc };
+        expect(getMacroExpansion(mockActivity, 'customMacro', 10, 20)).toEqual([['mockedExpansion']]);
+        expect(mockFunc).toHaveBeenCalledWith(10, 20);
+    });
+
+    test('should return predefined macro expansion for known blocks', () => {
+        const expansion = getMacroExpansion(mockActivity, 'actionhelp', 10, 20);
+        expect(Array.isArray(expansion)).toBe(true);
+        expect(expansion.length).toBeGreaterThan(0);
+    });
+
+    test('should return null for unknown macros', () => {
+        expect(getMacroExpansion(mockActivity, 'unknownMacro', 10, 20)).toBeNull();
+    });
+});

js/macros.js

@@ -1757,3 +1757,7 @@ const getMacroExpansion = (activity, blkname, x, y) => {
         return null;
     }
 };
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = blockIsMacro;
+    module.exports = getMacroExpansion; 
+}