make test a bit more explicit in what it checks

Author: yotamofek

tests/rustdoc/anchor-id-duplicate-method-name-25001.rs

@@ -7,7 +7,7 @@ pub struct Foo<T>(T);
 pub trait Bar {
     type Item;
 
-    fn quux(self);
+    fn quux(self) -> Self::Item;
 }
 
 impl Foo<u8> {
@@ -27,20 +27,20 @@ impl<T> Bar for Foo<T> {
     //@ has - '//*[@id="associatedtype.Item"]//h4[@class="code-header"]' 'type Item = T'
     type Item=T;
 
-    //@ has - '//*[@id="method.quux"]//h4[@class="code-header"]' 'fn quux(self)'
-    fn quux(self) {}
+    //@ has - '//*[@id="method.quux"]//h4[@class="code-header"]' 'fn quux(self) -> T'
+    fn quux(self) -> T {}
 }
 impl<'a, T> Bar for &'a Foo<T> {
     //@ has - '//*[@id="associatedtype.Item-1"]//h4[@class="code-header"]' "type Item = &'a T"
     type Item=&'a T;
 
-    //@ has - '//*[@id="method.quux-1"]//h4[@class="code-header"]' 'fn quux(self)'
-    fn quux(self) {}
+    //@ has - '//*[@id="method.quux-1"]//h4[@class="code-header"]' "fn quux(self) -> &'a T"
+    fn quux(self) -> &'a T {}
 }
 impl<'a, T> Bar for &'a mut Foo<T> {
     //@ has - '//*[@id="associatedtype.Item-2"]//h4[@class="code-header"]' "type Item = &'a mut T"
     type Item=&'a mut T;
 
-    //@ has - '//*[@id="method.quux-2"]//h4[@class="code-header"]' 'fn quux(self)'
-    fn quux(self) {}
+    //@ has - '//*[@id="method.quux-2"]//h4[@class="code-header"]' "fn quux(self) -> &'a mut T"
+    fn quux(self) -> &'a mut T {}
 }