rustdoc: add test case for scraped example expand GUI

src/bootstrap/test.rs

@@ -1011,6 +1011,8 @@ impl Step for RustdocGUI {
                 //        instead of hard-coding this test
                 if entry.file_name() == "link_to_definition" {
                     cargo.env("RUSTDOCFLAGS", "-Zunstable-options --generate-link-to-definition");
+                } else if entry.file_name() == "scrape_examples" {
+                    cargo.arg("-Zrustdoc-scrape-examples=examples");
                 }
                 builder.run(&mut cargo);
             }

src/test/rustdoc-gui/scrape-examples-button-focus.goml

@@ -0,0 +1,14 @@
+goto: "file://" + |DOC_PATH| + "/scrape_examples/fn.test.html"
+store-property: (smallOffsetHeight, ".scraped-example-list > .scraped-example pre", "offsetHeight")
+assert-property-false: (".scraped-example-list > .scraped-example pre", {
+	"scrollHeight": |smallOffsetHeight|
+})
+focus: ".scraped-example-list > .scraped-example .expand"
+press-key: "Enter"
+assert-property-false: (".scraped-example-list > .scraped-example pre", {
+	"offsetHeight": |smallOffsetHeight|
+})
+store-property: (fullOffsetHeight, ".scraped-example-list > .scraped-example pre", "offsetHeight")
+assert-property: (".scraped-example-list > .scraped-example pre", {
+	"scrollHeight": |fullOffsetHeight|
+})

src/test/rustdoc-gui/src/scrape_examples/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "scrape_examples"
+version = "0.1.0"

src/test/rustdoc-gui/src/scrape_examples/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "scrape_examples"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/test/rustdoc-gui/src/scrape_examples/examples/check.rs

@@ -0,0 +1,25 @@
+fn main() {
+    for i in 0..9 {
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+    }
+    scrape_examples::test();
+    for i in 0..9 {
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+        println!("hello world!");
+    }
+}

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

@@ -0,0 +1,7 @@
+/// # Examples
+///
+/// ```
+/// test();
+/// test();
+/// ```
+pub fn test() {}