// Not sure where to begin with gtest?
//
// What can I test with gtest?
//
// googletest/googletest/docs/primer.md

#include "lastseen.h"
#include "gtest/gtest.h"

namespace {

TEST(LastSeenTest, negative) {
  LastSeen zero(4);

  // buffer: -1, -1
  EXPECT_TRUE(zero.seen_before(-1));
  EXPECT_TRUE(zero.seen_before(-1));
}

TEST(LastSeenTest, basic) {
  LastSeen one(1);

  EXPECT_FALSE(one.seen_before(0));
  EXPECT_TRUE(one.seen_before(0));
  EXPECT_TRUE(one.seen_before(0));
  EXPECT_FALSE(one.seen_before(1));
  EXPECT_TRUE(one.seen_before(1));
  EXPECT_FALSE(one.seen_before(0));
}

TEST(LastSeenTest, Deep2) {
  LastSeen two(2);

  EXPECT_FALSE(two.seen_before(0));
  EXPECT_FALSE(two.seen_before(1));
  // buffer: 0, 1
  EXPECT_TRUE(two.seen_before(0));
  EXPECT_TRUE(two.seen_before(1));
  EXPECT_TRUE(two.seen_before(0));
  EXPECT_TRUE(two.seen_before(1));

  EXPECT_FALSE(two.seen_before(2));
  // buffer: 1, 2
  EXPECT_TRUE(two.seen_before(2));
  EXPECT_TRUE(two.seen_before(1));
  EXPECT_TRUE(two.seen_before(2));
  EXPECT_TRUE(two.seen_before(1));

  EXPECT_FALSE(two.seen_before(0));
}

TEST(LastSeenTest, More) {
  int x;

  LastSeen seven(7);
  for (x = 0; x < 7; x++) {
    EXPECT_FALSE(seven.seen_before(x));
  }
  // 0 - 6
  for (x = 0; x < 7; x++) {
    EXPECT_TRUE(seven.seen_before(x));
  }
  // 0 - 6
  EXPECT_FALSE(seven.seen_before(7));
  // 1 - 7
  for (x = 1; x < 8; x++) {
    EXPECT_TRUE(seven.seen_before(x));
  }
  EXPECT_FALSE(seven.seen_before(0));
  // 2 -6, 0
  for (x = 2; x < 7; x++) {
    EXPECT_TRUE(seven.seen_before(x));
  }
  EXPECT_TRUE(seven.seen_before(0));
}

} // namespace