fix: range request (#44)

close #43

tests/range.rs

@@ -0,0 +1,45 @@
+mod fixtures;
+mod utils;
+
+use fixtures::{server, Error, TestServer};
+use headers::HeaderValue;
+use rstest::rstest;
+
+#[rstest]
+fn get_file_range(server: TestServer) -> Result<(), Error> {
+    let resp = fetch!(b"GET", format!("{}index.html", server.url()))
+        .header("range", HeaderValue::from_static("bytes=0-6"))
+        .send()?;
+    assert_eq!(resp.status(), 206);
+    assert_eq!(resp.headers().get("content-range").unwrap(), "bytes 0-6/18");
+    assert_eq!(resp.headers().get("accept-ranges").unwrap(), "bytes");
+    assert_eq!(resp.headers().get("content-length").unwrap(), "7");
+    assert_eq!(resp.text()?, "This is");
+    Ok(())
+}
+
+#[rstest]
+fn get_file_range_beyond(server: TestServer) -> Result<(), Error> {
+    let resp = fetch!(b"GET", format!("{}index.html", server.url()))
+        .header("range", HeaderValue::from_static("bytes=12-20"))
+        .send()?;
+    assert_eq!(resp.status(), 206);
+    assert_eq!(
+        resp.headers().get("content-range").unwrap(),
+        "bytes 12-17/18"
+    );
+    assert_eq!(resp.headers().get("accept-ranges").unwrap(), "bytes");
+    assert_eq!(resp.headers().get("content-length").unwrap(), "6");
+    assert_eq!(resp.text()?, "x.html");
+    Ok(())
+}
+
+#[rstest]
+fn get_file_range_invalid(server: TestServer) -> Result<(), Error> {
+    let resp = fetch!(b"GET", format!("{}index.html", server.url()))
+        .header("range", HeaderValue::from_static("bytes=20-"))
+        .send()?;
+    assert_eq!(resp.status(), 416);
+    assert_eq!(resp.headers().get("content-range").unwrap(), "bytes */18");
+    Ok(())
+}