add tests for ShopController

src/main/kotlin/com/example/demo/controllers/ShopController.kt

@@ -14,11 +14,9 @@ import org.springframework.web.bind.annotation.RestController
 class ShopController (
     @field:Autowired private val shopProvider: ShopProvider,
 ) {
-    @GetMapping(value = ["/shop/common-info"], produces = ["application/json"] )
+    @GetMapping(value = ["/shop/common-info"], produces = ["application/json"])
     @ResponseBody
     fun commonInfo(response: HttpServletResponse): String {
-        response.contentType = "application/json"
-
         val shop = shopProvider.getRandomShop()
 
         if (shop == null) {

src/main/kotlin/com/example/demo/provider/html/HtmlProvider.kt

@@ -19,7 +19,7 @@ fun renderProductTable(): String {
                 }
             }
 
-            val products = getProducts()
+            val products = getInnerProducts()
             for ((i, product) in products.withIndex()) {
                 tr {
                     td (color = getCellColor(0, i+1)) {

src/main/kotlin/com/example/demo/provider/html/InnerProduct.kt

@@ -0,0 +1,11 @@
+package com.example.demo.provider.html
+
+data class InnerProduct(val description: String, val price: Double, val popularity: Int)
+
+fun getInnerProducts(): Set<InnerProduct> {
+    return setOf(
+        InnerProduct("one", 12.0, 12),
+        InnerProduct("two", 13.0, 20),
+        InnerProduct("three", 14.0, 50)
+    )
+}

src/main/kotlin/com/example/demo/provider/html/Product.kt

@@ -1,11 +0,0 @@
-package com.example.demo.provider.html
-
-data class Product(val description: String, val price: Double, val popularity: Int)
-
-fun getProducts(): Set<Product> {
-    return setOf(
-        Product("one", 12.0, 12),
-        Product("two", 13.0, 20),
-        Product("three", 14.0, 50)
-    )
-}