Add rustls support (#390)

tests/badssl.rs

@@ -0,0 +1,46 @@
+extern crate reqwest;
+
+
+#[cfg(feature = "tls")]
+#[test]
+fn test_badssl_modern() {
+    let text = reqwest::get("https://mozilla-modern.badssl.com/").unwrap()
+        .text().unwrap();
+
+    assert!(text.contains("<title>mozilla-modern.badssl.com</title>"));
+}
+
+#[cfg(feature = "tls")]
+#[test]
+fn test_badssl_self_signed() {
+    let text = reqwest::Client::builder()
+        .danger_accept_invalid_certs(true)
+        .build().unwrap()
+        .get("https://self-signed.badssl.com/")
+        .send().unwrap()
+        .text().unwrap();
+
+    assert!(text.contains("<title>self-signed.badssl.com</title>"));
+}
+
+#[cfg(feature = "default-tls")]
+#[test]
+fn test_badssl_wrong_host() {
+    let text = reqwest::Client::builder()
+        .danger_accept_invalid_hostnames(true)
+        .build().unwrap()
+        .get("https://wrong.host.badssl.com/")
+        .send().unwrap()
+        .text().unwrap();
+
+    assert!(text.contains("<title>wrong.host.badssl.com</title>"));
+
+
+    let result = reqwest::Client::builder()
+        .danger_accept_invalid_hostnames(true)
+        .build().unwrap()
+        .get("https://self-signed.badssl.com/")
+        .send();
+
+    assert!(result.is_err());
+}