test: Verify int32 format validation end-to-end via OpenApiServer

Author: thced

src/test/java/com/retailsvc/http/OpenApiServerIT.java

@@ -703,6 +703,58 @@ void formatByteShouldReturnOkOnValidBase64() {
     }
   }
 
+  @Nested
+  class FormatInt32 {
+
+    String path = "/format/int32";
+
+    @Test
+    void formatInt32ShouldReturnBadRequestOnOverflow() {
+      try (var server =
+              newServer(Map.of("format-int32", exchange -> exchange.sendResponseHeaders(200, -1)));
+          var client = httpClient()) {
+
+        var request = newRequest(server, path + "?n=2147483648", "GET", noBody());
+
+        var response = client.send(request, BodyHandlers.ofString());
+        var statusCode = response.statusCode();
+        var contentType = response.headers().firstValue("Content-Type").orElse("");
+        var responseBody = response.body();
+
+        assertThat(statusCode).isEqualTo(400);
+        assertThat(contentType).contains("application/problem+json");
+        assertThat(responseBody).contains("\"format\"");
+
+      } catch (IOException e) {
+        fail(e);
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+        fail(e);
+      }
+    }
+
+    @Test
+    void formatInt32ShouldReturnOkOnValidValue() {
+      try (var server =
+              newServer(Map.of("format-int32", exchange -> exchange.sendResponseHeaders(200, -1)));
+          var client = httpClient()) {
+
+        var request = newRequest(server, path + "?n=42", "GET", noBody());
+
+        var response = client.send(request, BodyHandlers.ofString());
+        var statusCode = response.statusCode();
+
+        assertThat(statusCode).isEqualTo(200);
+
+      } catch (IOException e) {
+        fail(e);
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+        fail(e);
+      }
+    }
+  }
+
   @Nested
   class Gates {
 

src/test/resources/openapi.json

@@ -272,6 +272,27 @@
         }
       }
     },
+    "/format/int32": {
+      "get": {
+        "operationId": "format-int32",
+        "parameters": [
+          {
+            "in": "query",
+            "name": "n",
+            "required": true,
+            "schema": {
+              "type": "integer",
+              "format": "int32"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK"
+          }
+        }
+      }
+    },
     "/format/byte": {
       "get": {
         "operationId": "format-byte",

src/test/resources/openapi.yaml

@@ -191,6 +191,20 @@ paths:
         "200":
           description: OK
 
+  /format/int32:
+    get:
+      operationId: format-int32
+      parameters:
+        - in: query
+          name: n
+          required: true
+          schema:
+            type: integer
+            format: int32
+      responses:
+        "200":
+          description: OK
+
   /format/byte:
     get:
       operationId: format-byte