Add testing

tests/MainTest.cpp

@@ -1,4 +1,46 @@
 #include <gtest/gtest.h>
+#include <iostream>
+#include <fstream>
+#include "preprocessor.hpp"
+#include "lexer.hpp"
+#include "syntax_tree.hpp"
+
+std::string LoadFile(const std::string& file) {
+  std::string program;
+  std::ifstream fin(file);
+  {
+    std::string str;
+    while (getline(fin, str)) {
+      str.push_back('\n');
+      program += str;
+    }
+  }
+  return program;
+}
+
+void RunTest(const std::string& program_file, const std::string& result_file) {
+  std::string program = LoadFile(program_file);
+  program = Preprocessor(std::move(program));
+  Lexer lexer;
+  lexer.ParseText(program);
+  auto tokens = lexer.GetTokens();
+  SyntaxTree tree;
+  tree.PushLexerTokenList(tokens);
+  tree.Compile();
+
+  SetPrintStringStream();
+  tree.Run();
+  std::string result = LoadFile(result_file);
+  ASSERT_EQ(result, GetPrintStringStream().str());
+}
+
+TEST(test_int, full_test) {
+  RunTest("programs/int/1.omgpl", "programs/int/1.res");
+}
+
+TEST(test_string, full_test) {
+  RunTest("programs/string/1.omgpl", "programs/string/1.res");
+}
 
 int main() {
   testing::InitGoogleTest();

tests/programs/int/1.omgpl

@@ -0,0 +1,13 @@
+int x = 0;
+for (int i = 0; i < 10; i += 1) {
+    x += i;
+}
+print(x);
+for (int i = 0; i < 10; i += 1) {
+    x -= i;
+}
+print(x);
+for (int i = 0; i < 4; i += 1) {
+    x = (x + 1) * i;
+}
+print(x);

tests/programs/int/1.res

@@ -0,0 +1,3 @@
+45
+0
+15

tests/programs/string/1.omgpl

@@ -0,0 +1,11 @@
+string s = "";
+
+for (int i = 0; i < 10; i += 1) {
+    if ((i / 2) * 2 == i) {
+        s += "a";
+    }
+    if ((i / 2) * 2 != i) {
+        s += "b";
+    }
+}
+print(s);

tests/programs/string/1.res

@@ -0,0 +1 @@
+ababababab