Make sure in-memory data is cleared after using

Author: crazytonyli

WordPressKit/HTTPClient.swift

@@ -321,3 +321,9 @@ private extension URLSession {
     }
 
 }
+
+extension URLSession {
+    var debugNumberOfTaskData: Int {
+        self.taskData.count
+    }
+}

WordPressKitTests/Utilities/URLSessionHelperTests.swift

@@ -16,6 +16,7 @@ class URLSessionHelperTests: XCTestCase {
     override func tearDown() {
         super.tearDown()
         HTTPStubs.removeAllStubs()
+        XCTAssertEqual(session.debugNumberOfTaskData, 0)
     }
 
     func testConnectionError() async throws {