Tests for child process stdin

To avoid cross-platform issues, these tests spawn platform- and 2/3-agnostic
Python scripts; Python is already required to run the test suite.

test/lib/fixtures/cat.py

@@ -0,0 +1,4 @@
+# Platform-agnostic replacement for 'cat' with no arguments.
+# Avoids 'print' to achieve Python 2/3 agnosticism as well.
+import sys
+sys.stdout.write(sys.stdin.read())

test/lib/fixtures/echo.py

@@ -0,0 +1,4 @@
+# Platform-agnostic replacement for 'echo -n'.
+# Avoids 'print' to achieve Python 2/3 agnosticism as well.
+import sys
+sys.stdout.write(" ".join(sys.argv[1:]))

test/module/child_process/basics.js

@@ -0,0 +1,36 @@
+// Test basic child process functionality
+//
+
+var fs = require('fs');
+var process = require('child_process');
+
+var ECHO_SCRIPT = fs.join(TEST_DIR, 'lib', 'fixtures', 'echo.py');
+var CAT_SCRIPT = fs.join(TEST_DIR, 'lib', 'fixtures', 'cat.py');
+
+
+async_test(function(){
+    var text = "hello";
+    var p = process.spawn(PYTHON, [ECHO_SCRIPT, text]);
+    var out = '';
+    p.stdout.on('data', function(data) { out += data; });
+    p.on('exit', this.step_func_done(
+        function(exitCode) {
+            assert_equals(exitCode, 0);
+            assert_equals(out, text);
+        }));
+}, "call a simple subprocess");
+
+async_test(function(){
+    var text = "hello";
+    var process = require('child_process');
+    var p = process.spawn(PYTHON, [CAT_SCRIPT]);
+    var out = '';
+    p.stdout.on('data', function(data) { out += data; });
+    p.on('exit', this.step_func_done(
+        function(exitCode) {
+            assert_equals(exitCode, 0);
+            assert_equals(out, text);
+        }));
+    p.stdin.write(text);
+    p.stdin.close();
+}, "call a subprocess that reads input");