junit: fix typo in comment and don't include output for passes when not requested

Author: durin42

library/test/src/formatters/junit.rs

@@ -31,7 +31,7 @@ fn str_to_cdata(s: &str) -> String {
     // `<?'` in a CDATA block, so the escaping gets a little weird.
     let escaped_output = s.replace("]]>", "]]]]><![CDATA[>");
     let escaped_output = escaped_output.replace("<?", "<]]><![CDATA[?");
-    // We also smuggle newlines as &#xa so as to keep all the output on line line
+    // We also smuggle newlines as &#xa so as to keep all the output on one line
     let escaped_output = escaped_output.replace("\n", "]]>&#xA;<![CDATA[");
     // Prune empty CDATA blocks resulting from any escaping
     let escaped_output = escaped_output.replace("<![CDATA[]]>", "");
@@ -163,7 +163,7 @@ impl<T: Write> OutputFormatter for JunitFormatter<T> {
                         test_name,
                         duration.as_secs_f64()
                     ))?;
-                    if stdout.is_empty() {
+                    if stdout.is_empty() || !state.options.display_output {
                         self.write_message("/>")?;
                     } else {
                         self.write_message("><system-out>")?;

tests/run-make/libtest-junit/output-default.xml

@@ -1 +1 @@
-<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="1" tests="4" skipped="1" ><testcase classname="unknown" name="a" time="$TIME"><system-out><![CDATA[print from successful test]]>&#xA;<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="b" time="$TIME"><failure type="assert"/><system-out><![CDATA[print from failing test]]>&#xA;<![CDATA[thread 'b' panicked at 'assertion failed: false', f.rs:10:5]]>&#xA;<![CDATA[note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace]]>&#xA;<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="c" time="$TIME"><system-out><![CDATA[thread 'c' panicked at 'assertion failed: false', f.rs:16:5]]>&#xA;<![CDATA[]]></system-out></testcase><system-out/><system-err/></testsuite></testsuites>
+<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="1" tests="4" skipped="1" ><testcase classname="unknown" name="a" time="$TIME"/><testcase classname="unknown" name="b" time="$TIME"><failure type="assert"/><system-out><![CDATA[print from failing test]]>&#xA;<![CDATA[thread 'b' panicked at 'assertion failed: false', f.rs:10:5]]>&#xA;<![CDATA[note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace]]>&#xA;<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="c" time="$TIME"/><system-out/><system-err/></testsuite></testsuites>