Change the linkchecker self-tests to validate more output.

src/tools/linkchecker/tests/checks.rs

@@ -15,7 +15,7 @@ fn run(dirname: &str) -> (ExitStatus, String, String) {
 fn broken_test(dirname: &str, expected: &str) {
     let (status, stdout, stderr) = run(dirname);
     assert!(!status.success());
-    if !stdout.contains(expected) {
+    if !contains(expected, &stdout) {
         panic!(
             "stdout did not contain expected text: {}\n\
             --- stdout:\n\
@@ -27,6 +27,25 @@ fn broken_test(dirname: &str, expected: &str) {
     }
 }
 
+fn contains(expected: &str, actual: &str) -> bool {
+    // Normalize for Windows paths.
+    let actual = actual.replace('\\', "/");
+    actual.lines().any(|mut line| {
+        for (i, part) in expected.split("[..]").enumerate() {
+            match line.find(part) {
+                Some(j) => {
+                    if i == 0 && j != 0 {
+                        return false;
+                    }
+                    line = &line[j + part.len()..];
+                }
+                None => return false,
+            }
+        }
+        line.is_empty() || expected.ends_with("[..]")
+    })
+}
+
 fn valid_test(dirname: &str) {
     let (status, stdout, stderr) = run(dirname);
     if !status.success() {
@@ -48,30 +67,46 @@ fn valid() {
 
 #[test]
 fn basic_broken() {
-    broken_test("basic_broken", "bar.html");
+    broken_test("basic_broken", "foo.html:3: broken link - `bar.html`");
 }
 
 #[test]
 fn broken_fragment_local() {
-    broken_test("broken_fragment_local", "#somefrag");
+    broken_test(
+        "broken_fragment_local",
+        "foo.html:3: broken link fragment `#somefrag` pointing to `foo.html`",
+    );
 }
 
 #[test]
 fn broken_fragment_remote() {
-    broken_test("broken_fragment_remote/inner", "#somefrag");
+    broken_test(
+        "broken_fragment_remote/inner",
+        "foo.html:3: broken link fragment `#somefrag` pointing to `foo.html`",
+    );
 }
 
 #[test]
 fn broken_redir() {
-    broken_test("broken_redir", "sometarget");
+    broken_test(
+        "broken_redir",
+        "foo.html:3: broken redirect from `redir-bad.html` to `sometarget`",
+    );
 }
 
 #[test]
 fn directory_link() {
-    broken_test("directory_link", "somedir");
+    broken_test(
+        "directory_link",
+        "foo.html:3: directory link to `somedir` (directory links should use index.html instead)",
+    );
 }
 
 #[test]
 fn redirect_loop() {
-    broken_test("redirect_loop", "redir-bad.html");
+    broken_test(
+        "redirect_loop",
+        "foo.html:3: redirect from `redir-bad.html` to `[..]redirect_loop/redir-bad.html` \
+         which is also a redirect (not supported)",
+    );
 }