Add testcases for issue 76296

As well as testing the ability to override the url, run the same
testcase with the `doc(html_root_url)` specified url.

Author: Nemo157

src/test/rustdoc/auxiliary/issue-76296-1.rs

@@ -0,0 +1,6 @@
+// compile-flags: -C metadata=1
+// compile-flags: -C extra-filename=-1
+#![crate_name="foo"]
+#![doc(html_root_url="https://example.com/foo/v1")]
+
+pub struct Foo1;

src/test/rustdoc/auxiliary/issue-76296-2.rs

@@ -0,0 +1,6 @@
+// compile-flags: -C metadata=2
+// compile-flags: -C extra-filename=-2
+#![crate_name = "foo"]
+#![doc(html_root_url="https://example.com/foo/v2")]
+
+pub struct Foo2;

src/test/rustdoc/issue-76296-override.rs

@@ -0,0 +1,32 @@
+// aux-build: issue-76296-1.rs
+// aux-build: issue-76296-2.rs
+// compile-flags: -Z unstable-options
+// compile-flags: --edition 2018
+// compile-flags: --extern priv:foo1={{build-base}}/issue-76296-override/auxiliary/libfoo-1.so
+// compile-flags: --extern priv:foo2={{build-base}}/issue-76296-override/auxiliary/libfoo-2.so
+// compile-flags: --extern-html-root-url foo=https://example.com/override/v1
+// compile-flags: --extern-html-root-url foo=https://example.com/override/v2
+
+// @has 'issue_76296_override/index.html'
+// @matches - '//a[@href="https://example.com/override/v1/foo/struct.Foo1.html"]' '^Foo1$'
+// @matches - '//a[@href="https://example.com/override/v2/foo/struct.Foo2.html"]' '^Foo2$'
+
+#[doc(no_inline)]
+pub use foo1::Foo1;
+
+#[doc(no_inline)]
+pub use foo2::Foo2;
+
+// @has 'issue_76296_override/fn.foo1.html'
+// @matches - '//a[@href="https://example.com/override/v1/foo/struct.Foo1.html"]' '^foo1::Foo1$'
+// @matches - '//a[@href="https://example.com/override/v1/foo/struct.Foo1.html"]' '^Foo1$'
+
+/// Makes a [`foo1::Foo1`]
+pub fn foo1() -> Foo1 { foo1::Foo1 }
+
+// @has 'issue_76296_override/fn.foo2.html'
+// @matches - '//a[@href="https://example.com/override/v2/foo/struct.Foo2.html"]' '^foo2::Foo2$'
+// @matches - '//a[@href="https://example.com/override/v2/foo/struct.Foo2.html"]' '^Foo2$'
+
+/// Makes a [`foo2::Foo2`]
+pub fn foo2() -> Foo2 { foo2::Foo2 }

src/test/rustdoc/issue-76296.rs

@@ -0,0 +1,30 @@
+// aux-build: issue-76296-1.rs
+// aux-build: issue-76296-2.rs
+// compile-flags: -Z unstable-options
+// compile-flags: --edition 2018
+// compile-flags: --extern priv:foo1={{build-base}}/issue-76296/auxiliary/libfoo-1.so
+// compile-flags: --extern priv:foo2={{build-base}}/issue-76296/auxiliary/libfoo-2.so
+
+// @has 'issue_76296/index.html'
+// @matches - '//a[@href="https://example.com/foo/v1/foo/struct.Foo1.html"]' '^Foo1$'
+// @matches - '//a[@href="https://example.com/foo/v2/foo/struct.Foo2.html"]' '^Foo2$'
+
+#[doc(no_inline)]
+pub use foo1::Foo1;
+
+#[doc(no_inline)]
+pub use foo2::Foo2;
+
+// @has 'issue_76296/fn.foo1.html'
+// @matches - '//a[@href="https://example.com/foo/v1/foo/struct.Foo1.html"]' '^foo1::Foo1$'
+// @matches - '//a[@href="https://example.com/foo/v1/foo/struct.Foo1.html"]' '^Foo1$'
+
+/// Makes a [`foo1::Foo1`]
+pub fn foo1() -> Foo1 { foo1::Foo1 }
+
+// @has 'issue_76296/fn.foo2.html'
+// @matches - '//a[@href="https://example.com/foo/v2/foo/struct.Foo2.html"]' '^foo2::Foo2$'
+// @matches - '//a[@href="https://example.com/foo/v2/foo/struct.Foo2.html"]' '^Foo2$'
+
+/// Makes a [`foo2::Foo2`]
+pub fn foo2() -> Foo2 { foo2::Foo2 }