string-to-integer-atoi-test.cpp

/*
 * Copyright (c) 2018 Christopher Friedt
 *
 * SPDX-License-Identifier: MIT
 */

#include <gtest/gtest.h>

#include "string-to-integer-atoi.cpp"

TEST(StringToIntegerAtoi, Test_empty) {
  string str("");
  int expected_int = 0;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_preceeding_zeros) {
  // preceeding zeros should not add to the full amount in decimal, but should
  // in hex. It isn't really common notation to have preceeding zeros in any
  // case.
  string str("010");
  int expected_int = 10;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_42) {
  string str("42");
  int expected_int = 42;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_____n42) {
  string str("    -42");
  int expected_int = -42;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_41983_with_words) {
  string str("41983 with words");
  int expected_int = 41983;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_words_and_987) {
  string str("words_and_987");
  int expected_int = 0;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_n91283472332) {
  string str("-91283472332");
  int expected_int = INT_MIN;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_n946384712) {
  // ok reverse, but not forward
  string str("-9463847412");
  int expected_int = INT_MIN;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_8463847412) {
  // ok reverse, but not forward
  string str("8463847412");
  int expected_int = INT_MAX;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_n9128347233250) {
  // too many decimal digits
  string str("-9128347233250");
  int expected_int = INT_MIN;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}

TEST(StringToIntegerAtoi, Test_9128347233250) {
  // too many decimal digits
  string str("9128347233250");
  int expected_int = INT_MAX;
  int actual_int = Solution().myAtoi(str);
  EXPECT_EQ(actual_int, expected_int);
}