Add a test reproducing the issue

Author: GabrielMajeri

tests/testsuite/config.rs

@@ -1,5 +1,6 @@
 //! Tests for config settings.
 
+use cargo::core::profiles::Strip;
 use cargo::core::{enable_nightly_features, Shell};
 use cargo::util::config::{self, Config, SslVersionConfig, StringList};
 use cargo::util::interning::InternedString;
@@ -1259,3 +1260,19 @@ fn string_list_advanced_env() {
         "error in environment variable `CARGO_KEY3`: expected string, found integer",
     );
 }
+
+#[cargo_test]
+fn parse_enum() {
+    write_config(
+        "\
+[profile.release]
+strip = 'debuginfo'
+",
+    );
+
+    let config = new_config();
+
+    let p: toml::TomlProfile = config.get("profile.release").unwrap();
+    let strip = p.strip.unwrap();
+    assert_eq!(strip, Strip::DebugInfo);
+}