Add new test::print_merged_doctests_times used by rustdoc to display more detailed time information

library/test/src/console.rs

@@ -281,23 +281,15 @@ fn on_test_event(
     Ok(())
 }
 
-/// A simple console test runner.
-/// Runs provided tests reporting process and results to the stdout.
-pub fn run_tests_console(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> io::Result<bool> {
+pub(crate) fn get_formatter(opts: &TestOpts, max_name_len: usize) -> Box<dyn OutputFormatter> {
     let output = match term::stdout() {
         None => OutputLocation::Raw(io::stdout()),
         Some(t) => OutputLocation::Pretty(t),
     };
 
-    let max_name_len = tests
-        .iter()
-        .max_by_key(|t| len_if_padded(t))
-        .map(|t| t.desc.name.as_slice().len())
-        .unwrap_or(0);
-
     let is_multithreaded = opts.test_threads.unwrap_or_else(get_concurrency) > 1;
 
-    let mut out: Box<dyn OutputFormatter> = match opts.format {
+    match opts.format {
         OutputFormat::Pretty => Box::new(PrettyFormatter::new(
             output,
             opts.use_color(),
@@ -310,7 +302,19 @@ pub fn run_tests_console(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> io::Resu
         }
         OutputFormat::Json => Box::new(JsonFormatter::new(output)),
         OutputFormat::Junit => Box::new(JunitFormatter::new(output)),
-    };
+    }
+}
+
+/// A simple console test runner.
+/// Runs provided tests reporting process and results to the stdout.
+pub fn run_tests_console(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> io::Result<bool> {
+    let max_name_len = tests
+        .iter()
+        .max_by_key(|t| len_if_padded(t))
+        .map(|t| t.desc.name.as_slice().len())
+        .unwrap_or(0);
+
+    let mut out = get_formatter(opts, max_name_len);
     let mut st = ConsoleTestState::new(opts)?;
 
     // Prevent the usage of `Instant` in some cases:

library/test/src/formatters/json.rs

@@ -215,6 +215,17 @@ impl<T: Write> OutputFormatter for JsonFormatter<T> {
 
         Ok(state.failed == 0)
     }
+
+    fn write_merged_doctests_times(
+        &mut self,
+        total_time: f64,
+        compilation_time: f64,
+    ) -> io::Result<()> {
+        let newline = "\n";
+        self.writeln_message(&format!(
+            r#"{{ "type": "report", "total_time": {total_time}, "compilation_time": {compilation_time} }}{newline}"#,
+        ))
+    }
 }
 
 /// A formatting utility used to print strings with characters in need of escaping.

library/test/src/formatters/junit.rs

@@ -182,6 +182,16 @@ impl<T: Write> OutputFormatter for JunitFormatter<T> {
 
         Ok(state.failed == 0)
     }
+
+    fn write_merged_doctests_times(
+        &mut self,
+        total_time: f64,
+        compilation_time: f64,
+    ) -> io::Result<()> {
+        self.write_message(&format!(
+            "<report total_time=\"{total_time}\" compilation_time=\"{compilation_time}\"></report>\n",
+        ))
+    }
 }
 
 fn parse_class_name(desc: &TestDesc) -> (String, String) {

library/test/src/formatters/mod.rs

@@ -33,6 +33,11 @@ pub(crate) trait OutputFormatter {
         state: &ConsoleTestState,
     ) -> io::Result<()>;
     fn write_run_finish(&mut self, state: &ConsoleTestState) -> io::Result<bool>;
+    fn write_merged_doctests_times(
+        &mut self,
+        total_time: f64,
+        compilation_time: f64,
+    ) -> io::Result<()>;
 }
 
 pub(crate) fn write_stderr_delimiter(test_output: &mut Vec<u8>, test_name: &TestName) {

library/test/src/formatters/pretty.rs

@@ -303,4 +303,14 @@ impl<T: Write> OutputFormatter for PrettyFormatter<T> {
 
         Ok(success)
     }
+
+    fn write_merged_doctests_times(
+        &mut self,
+        total_time: f64,
+        compilation_time: f64,
+    ) -> io::Result<()> {
+        self.write_plain(format!(
+            "all doctests ran in {total_time:.2}s; merged doctests compilation took {compilation_time:.2}s\n",
+        ))
+    }
 }

library/test/src/formatters/terse.rs

@@ -295,4 +295,14 @@ impl<T: Write> OutputFormatter for TerseFormatter<T> {
 
         Ok(success)
     }
+
+    fn write_merged_doctests_times(
+        &mut self,
+        total_time: f64,
+        compilation_time: f64,
+    ) -> io::Result<()> {
+        self.write_plain(format!(
+            "all doctests ran in {total_time:.2}s; merged doctests compilation took {compilation_time:.2}s\n",
+        ))
+    }
 }

library/test/src/lib.rs

@@ -244,6 +244,21 @@ fn make_owned_test(test: &&TestDescAndFn) -> TestDescAndFn {
     }
 }
 
+/// Public API used by rustdoc to display the `total` and `compilation` times in the expected
+/// format.
+pub fn print_merged_doctests_times(args: &[String], total_time: f64, compilation_time: f64) {
+    let opts = match cli::parse_opts(args) {
+        Some(Ok(o)) => o,
+        Some(Err(msg)) => {
+            eprintln!("error: {msg}");
+            process::exit(ERROR_EXIT_CODE);
+        }
+        None => return,
+    };
+    let mut formatter = console::get_formatter(&opts, 0);
+    formatter.write_merged_doctests_times(total_time, compilation_time).unwrap();
+}
+
 /// Invoked when unit tests terminate. Returns `Result::Err` if the test is
 /// considered a failure. By default, invokes `report()` and checks for a `0`
 /// result.