Add more tests for the first ch of the feature name

Signed-off-by: hi-rustin <rustin.liu@gmail.com>

Author: 0xPoe

src/tests/krate/publish/features.rs

@@ -33,6 +33,17 @@ fn feature_name_with_dot() {
     assert_json_snapshot!(crates);
 }
 
+#[test]
+fn feature_name_start_with_number_and_underscore() {
+    let (app, _, _, token) = TestApp::full().with_token();
+    let crate_to_publish = PublishBuilder::new("foo", "1.0.0")
+        .feature("0foo1.bar", &[])
+        .feature("_foo2.bar", &[]);
+    token.publish_crate(crate_to_publish).good();
+    let crates = app.crates_from_index_head("foo");
+    assert_json_snapshot!(crates);
+}
+
 #[test]
 fn empty_feature_name() {
     let (app, _, _, token) = TestApp::full().with_token();
@@ -65,6 +76,16 @@ fn invalid_feature_name2() {
     assert!(app.stored_files().is_empty());
 }
 
+#[test]
+fn invalid_feature_name_start_with_hyphen() {
+    let (app, _, _, token) = TestApp::full().with_token();
+    let crate_to_publish = PublishBuilder::new("foo", "1.0.0").feature("-foo1.bar", &[]);
+    let response = token.publish_crate(crate_to_publish);
+    assert_eq!(response.status(), StatusCode::OK);
+    assert_json_snapshot!(response.into_json());
+    assert!(app.stored_files().is_empty());
+}
+
 #[test]
 fn too_many_features() {
     let (app, _, _, token) = TestApp::full()

src/tests/krate/publish/snapshots/all__krate__publish__features__feature_name_start_with_number_and_underscore.snap

@@ -0,0 +1,17 @@
+---
+source: src/tests/krate/publish/features.rs
+expression: crates
+---
+[
+  {
+    "name": "foo",
+    "vers": "1.0.0",
+    "deps": [],
+    "cksum": "6f73fad556c46cdb740173ccc7a5f5bf64b8d954966be16963a08eb138e3c69c",
+    "features": {
+      "0foo1.bar": [],
+      "_foo2.bar": []
+    },
+    "yanked": false
+  }
+]

src/tests/krate/publish/snapshots/all__krate__publish__features__invalid_feature_name_start_with_hyphen.snap

@@ -0,0 +1,11 @@
+---
+source: src/tests/krate/publish/features.rs
+expression: response.into_json()
+---
+{
+  "errors": [
+    {
+      "detail": "invalid character `-` in feature `-foo1.bar`, the first character must be a Unicode XID start character or digit (most letters or `_` or `0` to `9`)"
+    }
+  ]
+}