2 files changed, 74 insertions, 0 deletions
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..428ebf9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,26 @@
+use std::error::Error;
+use std::net::IpAddr;
+use std::str::FromStr;
+use reqwest::Url;
+
+#[cfg(test)]
+mod test;
+
+fn main() {
+    println!("Hello, world!");
+}
+
+pub struct IpService {}
+
+impl IpService {
+
+    async fn resolve(config: &impl IpServiceConfiguration) -> Result<IpAddr, Box<dyn Error>> {
+        let response = reqwest::get(config.get_service_url()).await.unwrap();
+        Ok(IpAddr::from_str(&response.text().await.unwrap())?)
+    }
+
+}
+
+pub trait IpServiceConfiguration {
+    fn get_service_url(&self) -> Url;
+}
diff --git a/src/test.rs b/src/test.rs
new file mode 100644
index 0000000..f2c4219
--- /dev/null
+++ b/src/test.rs
@@ -0,0 +1,48 @@
+use std::net::{IpAddr, Ipv4Addr};
+use reqwest::Url;
+use wiremock::{Mock, MockServer, ResponseTemplate};
+use wiremock::matchers::{method, path};
+use crate::{IpService, IpServiceConfiguration};
+
+async fn setup_ipv4_service(service_path: &str, response: &str) -> MockServer {
+    let ip_service = MockServer::start().await;
+
+    Mock::given(method("GET"))
+        .and(path(service_path))
+        .respond_with(ResponseTemplate::new(200)
+            .insert_header("Content-Type", "text/plain; charset=utf-8")
+            .set_body_string(response))
+        .mount(&ip_service)
+        .await;
+
+    ip_service
+}
+
+#[tokio::test]
+async fn successful_ipv4_address_resolution() {
+    let service_path = "get-my-ip-address";
+    let service_response = "17.5.7.8";
+
+    let ip_service = setup_ipv4_service(service_path, service_response).await;
+    let service_config = TestIpServiceConfiguration::new(&ip_service, service_path);
+
+    let actual = IpService::resolve(&service_config).await.unwrap();
+    assert_eq!(actual, IpAddr::V4(Ipv4Addr::new(17, 5, 7, 8)))
+}
+
+struct TestIpServiceConfiguration {
+    service_url: Url,
+}
+
+impl TestIpServiceConfiguration {
+    fn new(server: &MockServer, path: &str) -> Self {
+        Self {
+            service_url: Url::parse(format!("{}/{}", server.uri(), path).as_str()).unwrap()
+        }
+    }
+}
+impl IpServiceConfiguration for TestIpServiceConfiguration {
+    fn get_service_url(&self) -> Url {
+        self.service_url.clone()
+    }
+}