added endpoint client

tests/api/helpers.rs

@@ -8,6 +8,18 @@ pub struct TestApp {
 	pub connection_pool: Pool<Postgres>,
 }
 
+impl TestApp {
+	pub async fn post_subscriptions(&self, body: String) -> reqwest::Response {
+		reqwest::Client::new()
+			.post(&format!("{}/subscriptions", &self.address))
+			.header("Content-Type", "application/x-www-form-urlencoded")
+			.body(body)
+			.send()
+			.await
+			.expect("Failed to execute request.")
+	}
+}
+
 static TRACING: Lazy<()> = Lazy::new(|| {
 	let default_filter_level = "info".to_string();
 	let subscriber_name = "test".to_string();