Fix trailing newline in JUnit formatter

library/test/src/formatters/junit.rs

@@ -189,8 +189,10 @@ impl<T: Write> OutputFormatter for JunitFormatter<T> {
         compilation_time: f64,
     ) -> io::Result<()> {
         self.write_message(&format!(
-            "<report total_time=\"{total_time}\" compilation_time=\"{compilation_time}\"></report>\n",
-        ))
+            "<report total_time=\"{total_time}\" compilation_time=\"{compilation_time}\"></report>",
+        ))?;
+        self.out.write_all(b"\n")?;
+        Ok(())
     }
 }
 

tests/run-make/doctests-junit/doctest-2021.xml

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="0" tests="3" skipped="0" ><testcase classname="doctest.rs" name="add (line 1)" time="$TIME"/><testcase classname="doctest.rs" name="add (line 5)" time="$TIME"/><testcase classname="doctest.rs" name="add (line 9)" time="$TIME"/><system-out/><system-err/></testsuite></testsuites>

tests/run-make/doctests-junit/doctest-2024.xml

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="0" tests="2" skipped="0" ><testcase classname="doctest.rs" name="add (line 1)" time="$TIME"/><testcase classname="doctest.rs" name="add (line 5)" time="$TIME"/><system-out/><system-err/></testsuite></testsuites>
+<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="0" tests="1" skipped="0" ><testcase classname="doctest.rs" name="add (line 9)" time="$TIME"/><system-out/><system-err/></testsuite></testsuites>
+<report total_time="$TIME" compilation_time="$TIME"></report>

tests/run-make/doctests-junit/doctest.rs

@@ -0,0 +1,14 @@
+/// ```
+/// assert_eq!(doctest::add(2, 2), 4);
+/// ```
+///
+/// ```should_panic
+/// assert_eq!(doctest::add(2, 2), 5);
+/// ```
+///
+/// ```compile_fail
+/// assert_eq!(doctest::add(2, 2), "banana");
+/// ```
+pub fn add(a: i32, b: i32) -> i32 {
+    a + b
+}

tests/run-make/doctests-junit/rmake.rs

@@ -0,0 +1,45 @@
+// Check rustdoc's test JUnit (XML) output against snapshots.
+
+//@ ignore-cross-compile (running doctests)
+//@ ignore-stage1 (rustdoc depends on a fix in libtest)
+//@ needs-unwind (test file contains `should_panic` test)
+
+use std::path::Path;
+
+use run_make_support::{cwd, diff, python_command, rustc, rustdoc};
+
+fn main() {
+    let rlib = cwd().join("libdoctest.rlib");
+    rustc().input("doctest.rs").crate_type("rlib").output(&rlib).run();
+
+    run_doctests(&rlib, "2021", "doctest-2021.xml");
+    run_doctests(&rlib, "2024", "doctest-2024.xml");
+}
+
+#[track_caller]
+fn run_doctests(rlib: &Path, edition: &str, expected_xml: &str) {
+    let rustdoc_out = rustdoc()
+        .input("doctest.rs")
+        .args(&[
+            "--test",
+            "--test-args=-Zunstable-options",
+            "--test-args=--test-threads=1",
+            "--test-args=--format=junit",
+        ])
+        .edition(edition)
+        .env("RUST_BACKTRACE", "0")
+        .extern_("doctest", rlib.display().to_string())
+        .run();
+    let rustdoc_stdout = &rustdoc_out.stdout_utf8();
+
+    // FIXME: merged output of compile_fail tests is broken
+    if edition != "2024" {
+        python_command().arg("validate_junit.py").stdin_buf(rustdoc_stdout).run();
+    }
+
+    diff()
+        .expected_file(expected_xml)
+        .actual_text("output", rustdoc_stdout)
+        .normalize(r#"\b(time|total_time|compilation_time)="[0-9.]+""#, r#"$1="$$TIME""#)
+        .run();
+}

tests/run-make/doctests-junit/validate_junit.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+# Trivial Python script that reads lines from stdin, and checks that each line
+# is a well-formed XML document.
+#
+# This takes advantage of the fact that Python has a built-in XML parser,
+# whereas doing the same check in Rust would require us to pull in an XML
+# crate just for this relatively-minor test.
+#
+# If you're trying to remove Python scripts from the test suite, think twice
+# before removing this one. You could do so, but it's probably not worth it.
+
+import sys
+import xml.etree.ElementTree as ET
+
+# Read the entire output and try to decode it as XML.
+junit = sys.stdin.read()
+try:
+    ET.fromstring(junit)
+except ET.ParseError:
+    print("Invalid xml: %r" % junit)
+    raise

tests/run-make/libtest-junit/validate_junit.py

@@ -13,10 +13,10 @@
 import sys
 import xml.etree.ElementTree as ET
 
-# Try to decode line in order to ensure it is a valid XML document
-for line in sys.stdin:
-    try:
-        ET.fromstring(line)
-    except ET.ParseError:
-        print("Invalid xml: %r" % line)
-        raise
+# Read the entire output and try to decode it as XML.
+junit = sys.stdin.read()
+try:
+    ET.fromstring(junit)
+except ET.ParseError:
+    print("Invalid xml: %r" % junit)
+    raise