API endpoint for testing webhook (#3550)

* API endpoint for testing webhook

* Empty commit to rerun CI

public/swagger.v1.json

@@ -1565,6 +1565,46 @@
         }
       }
     },
+    "/repos/{owner}/{repo}/hooks/{id}/tests": {
+      "post": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Test a push webhook",
+        "operationId": "repoTestHook",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "integer",
+            "description": "id of the hook to test",
+            "name": "id",
+            "in": "path",
+            "required": true
+          }
+        ],
+        "responses": {
+          "204": {
+            "$ref": "#/responses/empty"
+          }
+        }
+      }
+    },
     "/repos/{owner}/{repo}/issue/{index}/comments": {
       "get": {
         "produces": [