package ch3;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import java.util.stream.Stream;

import static ch3.LeftPadUtils.leftPad;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.params.provider.Arguments.of;

public class LeftPadTest {

    @ParameterizedTest
    @MethodSource("generator")
    void test(String originalStr, int size, String padString, String expectedStr) {
        assertThat(leftPad(originalStr, size, padString))
                .isEqualTo(expectedStr);
    }

    static Stream<Arguments> generator() {
        return Stream.of(
            of(null, 10, "-", null), // T1
            of("", 5, "-", "-----"), // T2
            of("abc", -1, "-", "abc"), // T3
            of("abc", 5, null, "  abc"), // T4
            of("abc", 5, "", "  abc"), // T5
            of("abc", 5, "-", "--abc"), // T6
            of("abc", 3, "-", "abc"), // T7
            of("abc", 0, "-", "abc"), // T8
            of("abc", 2, "-", "abc"), // T9
            of("abc", 5, "--", "--abc"), // T10
            of("abc", 5, "---", "--abc"), // T11
            of("abc", 5, "-", "--abc") // T12
        );
    }

    @Test
    void sameInstance() {
        String str = "sometext";
        assertThat(leftPad(str, 5, "-"))
                .isSameAs(str);
    }

}