1 files changed, 40 insertions, 0 deletions
diff --git a/library/test/src/formatters/mod.rs b/library/test/src/formatters/mod.rs
new file mode 100644
index 00000000000..1fb840520a6
--- /dev/null
+++ b/library/test/src/formatters/mod.rs
@@ -0,0 +1,40 @@
+use std::{io, io::prelude::Write};
+
+use crate::{
+    console::ConsoleTestState,
+    test_result::TestResult,
+    time,
+    types::{TestDesc, TestName},
+};
+
+mod json;
+mod pretty;
+mod terse;
+
+pub(crate) use self::json::JsonFormatter;
+pub(crate) use self::pretty::PrettyFormatter;
+pub(crate) use self::terse::TerseFormatter;
+
+pub(crate) trait OutputFormatter {
+    fn write_run_start(&mut self, test_count: usize) -> io::Result<()>;
+    fn write_test_start(&mut self, desc: &TestDesc) -> io::Result<()>;
+    fn write_timeout(&mut self, desc: &TestDesc) -> io::Result<()>;
+    fn write_result(
+        &mut self,
+        desc: &TestDesc,
+        result: &TestResult,
+        exec_time: Option<&time::TestExecTime>,
+        stdout: &[u8],
+        state: &ConsoleTestState,
+    ) -> io::Result<()>;
+    fn write_run_finish(&mut self, state: &ConsoleTestState) -> io::Result<bool>;
+}
+
+pub(crate) fn write_stderr_delimiter(test_output: &mut Vec<u8>, test_name: &TestName) {
+    match test_output.last() {
+        Some(b'\n') => (),
+        Some(_) => test_output.push(b'\n'),
+        None => (),
+    }
+    writeln!(test_output, "---- {} stderr ----", test_name).unwrap();
+}