Add test to ensure tables are not inside items summary

Author: GuillaumeGomez

src/test/rustdoc-gui/item-summary-table.goml

@@ -0,0 +1,6 @@
+// This test ensures that <table> elements aren't display in items summary.
+goto: file://|DOC_PATH|/lib2/summary_table/index.html
+// We check that we picked the right item first.
+assert-text: (".item-table .item-left", "Foo")
+// Then we check that its summary is empty.
+assert-text: (".item-table .item-right", "")

src/test/rustdoc-gui/src/lib2/lib.rs

@@ -54,3 +54,10 @@ pub mod long_trait {
     pub trait ALongNameBecauseItHelpsTestingTheCurrentProblem: DerefMut<Target = u32>
         + From<u128> + Send + Sync + AsRef<str> + 'static {}
 }
+
+pub mod summary_table {
+    /// | header 1 | header 2 |
+    /// | -------- | -------- |
+    /// | content | content |
+    pub struct Foo;
+}