Add back the substring test

src/test/rustdoc-js/substring.js

@@ -0,0 +1,8 @@
+const QUERY = 'waker_from';
+
+const EXPECTED = {
+    'others': [
+        { 'path': 'substring::SuperWaker', 'name': 'local_waker_from_nonlocal' },
+        { 'path': 'substring::SuperWakerTask', 'name': 'local_waker_from_nonlocal' },
+    ],
+};

src/test/rustdoc-js/substring.rs

@@ -0,0 +1,21 @@
+pub struct SuperWaker;
+
+impl SuperWaker {
+    pub fn local_waker_from_nonlocal() {}
+    pub fn local_waker_frm_nonlocal() {}
+    pub fn some_method() {}
+    pub fn some_other_method() {}
+    pub fn waker_non_local() {}
+    pub fn from_non_local() {}
+}
+
+pub struct SuperWakerTask;
+
+impl SuperWakerTask {
+    pub fn local_waker_from_nonlocal() {}
+    pub fn local_waker_frm_nonlocal() {}
+    pub fn some_method() {}
+    pub fn some_other_method() {}
+    pub fn waker_non_local() {}
+    pub fn from_non_local() {}
+}