assertEquals(ImmutableSet.of(1), testTable.columnKeySet());
  }

  public void testColumnMap() {
    assertEquals(ImmutableMap.of(1, ImmutableMap.of('a', "blah")), testTable.columnMap());
  }

  public void testRow() {
    assertEquals(ImmutableMap.of(), testTable.row('A'));
    assertEquals(ImmutableMap.of(1, "blah"), testTable.row('a'));
  }

  public void testRowKeySet() {

      assertTrue(testInstance.containsRow('a'));
      assertTrue(testInstance.containsRow('b'));
      assertFalse(testInstance.containsRow('c'));
    }
  }

  public void testRow() {
    for (ImmutableTable<Character, Integer, String> testInstance : getTestInstances()) {
      assertEquals(ImmutableMap.of(1, "foo", 2, "baz"), testInstance.row('a'));

    assertEquals(expected, table.hashCode());
  }

  public void testToStringSize1() {
    table = create("foo", 1, 'a');
    assertEquals("{foo={1=a}}", table.toString());
  }

  public void testRow() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    assertEquals(ImmutableMap.of(1, 'a', 3, 'c'), table.row("foo"));
  }

  // This test assumes that the implementation does not support null keys.

    assertEquals(expected, table.hashCode());
  }

  public void testToStringSize1() {
    table = create("foo", 1, 'a');
    assertEquals("{foo={1=a}}", table.toString());
  }

  public void testRow() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    assertEquals(ImmutableMap.of(1, 'a', 3, 'c'), table.row("foo"));
  }

  // This test assumes that the implementation does not support null keys.

        assertTrue(isPerfectSquare);
      } catch (ArithmeticException e) {
        assertFalse(isPerfectSquare);
      }
    }
  }

  @GwtIncompatible // 2147483646^2 expected=4
  public void testPow() {
    for (int i : ALL_INTEGER_CANDIDATES) {
      for (int pow : EXPONENTS) {
        assertEquals(i + "^" + pow, BigInteger.valueOf(i).pow(pow).intValue(), IntMath.pow(i, pow));
      }
    }
  }

        assertTrue(isPerfectSquare);
      } catch (ArithmeticException e) {
        assertFalse(isPerfectSquare);
      }
    }
  }

  @GwtIncompatible // 2147483646^2 expected=4
  public void testPow() {
    for (int i : ALL_INTEGER_CANDIDATES) {
      for (int pow : EXPONENTS) {
        assertEquals(i + "^" + pow, BigInteger.valueOf(i).pow(pow).intValue(), IntMath.pow(i, pow));
      }
    }
  }

### Testy

* Pomóż mi sprawdzić, czy PR ma **testy**.

* Sprawdź, czy testy **nie przechodzą** przed PR. 🚨

* Następnie sprawdź, czy testy **przechodzą** po PR. ✅

* Wiele PR-ów nie ma testów, możesz **przypomnieć** im o dodaniu testów, a nawet **zaproponować** samemu jakieś testy. To jedna z rzeczy, które pochłaniają najwięcej czasu i możesz w tym bardzo pomóc.

        assertTrue(isPerfectSquare);
      } catch (ArithmeticException e) {
        assertFalse(isPerfectSquare);
      }
    }
  }

  @GwtIncompatible // TODO
  public void testPow() {
    for (long i : ALL_LONG_CANDIDATES) {
      for (int exp : EXPONENTS) {
        assertEquals(LongMath.pow(i, exp), valueOf(i).pow(exp).longValue());
      }
    }
  }

    for (long a : TEST_LONGS) {
      assertThrows(
          ArithmeticException.class,
          () -> UnsignedLong.fromLongBits(a).dividedBy(UnsignedLong.ZERO));
    }
  }

  public void testMod() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        if (b != 0) {
          UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);

    for (long a : TEST_LONGS) {
      assertThrows(
          ArithmeticException.class,
          () -> UnsignedLong.fromLongBits(a).dividedBy(UnsignedLong.ZERO));
    }
  }

  public void testMod() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        if (b != 0) {
          UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);