test: convert single test file to test suite

tests/api/health_check.rs

@@ -0,0 +1,19 @@
+use crate::helpers::{spawn_app, TestApp};
+
+#[tokio::test]
+async fn health_check_works() {
+    // Arrange
+    let TestApp { address, .. } = spawn_app().await;
+
+    // Act
+    let client = reqwest::Client::new();
+    let response = client
+        .get(format!("{address}/health_check"))
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    // Assert
+    assert!(response.status().is_success());
+    assert_eq!(Some(0), response.content_length());
+}