test: add happy case for email client

src/email_client.rs

@@ -72,8 +72,9 @@ mod tests {
     use fake::faker::lorem::en::{Paragraph, Sentence};
     use fake::{Fake, Faker};
     use secrecy::Secret;
-    use wiremock::matchers::{header, header_exists, method, path};
+    use wiremock::matchers::{any, header, header_exists, method, path};
     use wiremock::{Mock, MockServer, Request, ResponseTemplate};
+    use claims::assert_ok;
 
     struct SendEmailBodyMatcher;
 
@@ -97,6 +98,36 @@ mod tests {
         }
     }
 
+    #[tokio::test]
+    async fn send_email_succeeds_if_the_server_returns_200() {
+        // Arrange
+        let mock_server = MockServer::start().await;
+        let sender = SubscriberEmail::parse(SafeEmail().fake()).unwrap();
+        let email_client = EmailClient::new(
+            mock_server.uri(),
+            sender,
+            Secret::new(Faker.fake())
+        );
+
+        let subscriber_email = SubscriberEmail::parse(SafeEmail().fake()).unwrap();
+        let subject: String = Sentence(1..2).fake();
+        let content: String = Paragraph(1..10).fake();
+
+        Mock::given(any())
+            .respond_with(ResponseTemplate::new(200))
+            .expect(1)
+            .mount(&mock_server)
+            .await;
+
+        // Act
+        let outcome = email_client
+            .send_email(subscriber_email, &subject, &content, &content)
+            .await;
+
+        // Assert
+        assert_ok!(outcome);
+    }
+
     #[tokio::test]
     async fn send_email_sends_the_expected_request() {
         // Arrange