server: test buffer parsing

Tests/CMakeServerLib/testServerBuffering.cpp

@@ -0,0 +1,86 @@
+#include "cmConnection.h"
+#include "cmServerConnection.h"
+#include <iostream>
+#include <stddef.h>
+#include <string>
+#include <vector>
+
+void print_error(const std::vector<std::string>& input,
+                 const std::vector<std::string>& output)
+{
+  std::cerr << "Responses don't equal input messages input." << std::endl;
+  std::cerr << "Responses: " << std::endl;
+
+  for (auto& msg : output) {
+    std::cerr << "'" << msg << "'" << std::endl;
+  }
+
+  std::cerr << "Input messages" << std::endl;
+  for (auto& msg : input) {
+    std::cerr << "'" << msg << "'" << std::endl;
+  }
+}
+
+std::string trim_newline(const std::string& _buffer)
+{
+  auto buffer = _buffer;
+  while (!buffer.empty() && (buffer.back() == '\n' || buffer.back() == '\r')) {
+    buffer.pop_back();
+  }
+  return buffer;
+}
+
+int testServerBuffering(int, char** const)
+{
+  std::vector<std::string> messages = {
+    "{ \"test\": 10}", "{ \"test\": { \"test2\": false} }",
+    "{ \"test\": [1, 2, 3] }",
+    "{ \"a\": { \"1\": {}, \n\n\n \"2\":[] \t\t\t\t}}"
+  };
+
+  std::string fullMessage;
+  for (auto& msg : messages) {
+    fullMessage += "[== \"CMake Server\" ==[\n";
+    fullMessage += msg;
+    fullMessage += "\n]== \"CMake Server\" ==]\n";
+  }
+
+  // The buffering strategy should cope with any fragmentation, including
+  // just getting the characters one at a time.
+  auto bufferingStrategy =
+    std::unique_ptr<cmConnectionBufferStrategy>(new cmServerBufferStrategy);
+  std::vector<std::string> response;
+  std::string rawBuffer;
+  for (size_t i = 0; i < fullMessage.size(); i++) {
+    rawBuffer += fullMessage[i];
+    std::string packet = bufferingStrategy->BufferMessage(rawBuffer);
+    do {
+      if (!packet.empty() && packet != "\r\n") {
+        response.push_back(trim_newline(packet));
+      }
+      packet = bufferingStrategy->BufferMessage(rawBuffer);
+    } while (!packet.empty());
+  }
+
+  if (response != messages) {
+    print_error(messages, response);
+    return 1;
+  }
+
+  // We should also be able to deal with getting a bunch at once
+  response.clear();
+  std::string packet = bufferingStrategy->BufferMessage(fullMessage);
+  do {
+    if (!packet.empty() && packet != "\r\n") {
+      response.push_back(trim_newline(packet));
+    }
+    packet = bufferingStrategy->BufferMessage(fullMessage);
+  } while (!packet.empty());
+
+  if (response != messages) {
+    print_error(messages, response);
+    return 1;
+  }
+
+  return 0;
+}