add process tests

libs/main/system/piprocess.h

@@ -68,11 +68,19 @@ public:
 
 	//! \~english Returns all attached execution output stream
 	//! \~russian
-	PIByteArray readOutput(bool clear = false);
+	PIByteArray readOutput();
 
 	//! \~english Returns all attached execution error stream
 	//! \~russian
-	PIByteArray readError(bool clear = false);
+	PIByteArray readError();
+
+	//! \~english Write data to attached execution input stream
+	//! \~russian
+	bool writeInput(const PIByteArray & data);
+
+	//! \~english Close attached execution input stream and send EOF
+	//! \~russian
+	void closeInput();
 
 	//! \~english Returns current attached execution environment
 	//! \~russian