1 files changed, 69 insertions, 0 deletions
diff --git a/tests/ui-fulldeps/stdio-from.rs b/tests/ui-fulldeps/stdio-from.rs
new file mode 100644
index 000000000..fef9f27fc
--- /dev/null
+++ b/tests/ui-fulldeps/stdio-from.rs
@@ -0,0 +1,69 @@
+// run-pass
+// ignore-cross-compile
+
+use std::env;
+use std::fs::File;
+use std::io;
+use std::io::{Read, Write};
+use std::process::{Command, Stdio};
+use std::path::PathBuf;
+
+fn main() {
+    if env::args().len() > 1 {
+        child().unwrap()
+    } else {
+        parent().unwrap()
+    }
+}
+
+fn parent() -> io::Result<()> {
+    let td = PathBuf::from(env::var_os("RUST_TEST_TMPDIR").unwrap());
+    let input = td.join("stdio-from-input");
+    let output = td.join("stdio-from-output");
+
+    File::create(&input)?.write_all(b"foo\n")?;
+
+    // Set up this chain:
+    //     $ me <file | me | me >file
+    // ... to duplicate each line 8 times total.
+
+    let mut child1 = Command::new(env::current_exe()?)
+        .arg("first")
+        .stdin(File::open(&input)?) // tests File::into()
+        .stdout(Stdio::piped())
+        .spawn()?;
+
+    let mut child3 = Command::new(env::current_exe()?)
+        .arg("third")
+        .stdin(Stdio::piped())
+        .stdout(File::create(&output)?) // tests File::into()
+        .spawn()?;
+
+    // Started out of order so we can test both `ChildStdin` and `ChildStdout`.
+    let mut child2 = Command::new(env::current_exe()?)
+        .arg("second")
+        .stdin(child1.stdout.take().unwrap()) // tests ChildStdout::into()
+        .stdout(child3.stdin.take().unwrap()) // tests ChildStdin::into()
+        .spawn()?;
+
+    assert!(child1.wait()?.success());
+    assert!(child2.wait()?.success());
+    assert!(child3.wait()?.success());
+
+    let mut data = String::new();
+    File::open(&output)?.read_to_string(&mut data)?;
+    for line in data.lines() {
+        assert_eq!(line, "foo");
+    }
+    assert_eq!(data.lines().count(), 8);
+    Ok(())
+}
+
+fn child() -> io::Result<()> {
+    // double everything
+    let mut input = vec![];
+    io::stdin().read_to_end(&mut input)?;
+    io::stdout().write_all(&input)?;
+    io::stdout().write_all(&input)?;
+    Ok(())
+}