fix: add extra test to validate api query decorator

Added an extra test to validate the api query decorator change regarding isArray prop
This change is needed to create valid OpenAPI documents.

Closes #1221

test/explorer/swagger-explorer.spec.ts

@@ -784,6 +784,20 @@ describe('SwaggerExplorer', () => {
 
     @Controller('')
     class FooController {
+      @Get('foos/:objectId')
+      @ApiParam({
+        name: 'objectId',
+        enum: ParamEnum
+      })
+      @ApiQuery({ name: 'order', enum: QueryEnum })
+      @ApiQuery({ name: 'page', enum: ['d', 'e', 'f'], isArray: true })
+      find(): Promise<Foo[]> {
+        return Promise.resolve([]);
+      }
+    }
+
+    @Controller('')
+    class Foo2Controller {
       @Get('foos/:objectId')
       @ApiParam({
         name: 'objectId',
@@ -829,11 +843,15 @@ describe('SwaggerExplorer', () => {
       expect(routes[0].root.parameters).toEqual([
         {
           in: 'query',
+          isArray: true,
           name: 'page',
           required: true,
           schema: {
-            enum: ['d', 'e', 'f'],
-            type: 'string'
+            items: {
+              type: 'string',
+              enum: ['d', 'e', 'f'],
+            },
+            type: "array"
           }
         },
         {
@@ -857,6 +875,47 @@ describe('SwaggerExplorer', () => {
       ]);
     });
 
+    it('should properly define enum and not add isArray prop to params', () => {
+      const explorer = new SwaggerExplorer(schemaObjectFactory);
+      const routes = explorer.exploreController(
+        {
+          instance: new Foo2Controller(),
+          metatype: Foo2Controller
+        } as InstanceWrapper<Foo2Controller>,
+        'path'
+      );
+
+      expect(routes[0].root.parameters).toEqual([
+        {
+          in: 'query',
+          name: 'page',
+          required: true,
+          schema: {
+            type: 'string',
+            enum: ['d', 'e', 'f'],
+          }
+        },
+        {
+          in: 'query',
+          name: 'order',
+          required: true,
+          schema: {
+            type: 'string',
+            enum: ['d', 'e', 'f']
+          }
+        },
+        {
+          in: 'path',
+          name: 'objectId',
+          required: true,
+          schema: {
+            type: 'string',
+            enum: ['a', 'b', 'c']
+          }
+        }
+      ])
+    })
+
     it('should properly define enum as schema with lazy function', () => {
       const explorer = new SwaggerExplorer(schemaObjectFactory);
       const routes = explorer.exploreController(