Handle stdio redirection in standalone VM

tests/standalone/src/DartStdIOPipeTest.sh

Index: tests/standalone/src/DartStdIOPipeTest.sh
diff --git a/tests/standalone/src/DartStdIOPipeTest.sh b/tests/standalone/src/DartStdIOPipeTest.sh
new file mode 100755
index 0000000000000000000000000000000000000000..9677dc7d4473866ea0a0cd9e11892e57d8773b39
--- /dev/null
+++ b/tests/standalone/src/DartStdIOPipeTest.sh
@@ -0,0 +1,13 @@
+#! /bin/bash
+
+# This script expects the following arguments
+# $1: Path to dart executable
+# $2: Path to dart echoing script
+# $3: Argument to dart echoing script (0, 1 or 2)
+# $4: File for output from piping stdout and stderr
+# $5: File prefix for output from redirecting stdout and stderr to a file.
+
+# Test piping and stdio file redirection.
+echo "Hello" | $1 $2 $3 2>&1 | cat - > $4
+$1 $2 $3 < $4 > $5.stdout 2> $5.stderr
+$1 $2 $3 < $4 >> $5.stdout 2>> $5.stderr