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Neetika23 2023-12-13 23:22:15 +05:30 committed by GitHub
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core-java-modules/core-java-arrays-guides/src/test/java/com/baeldung/print2darrays/Print2DArraysUnitTest.java Normal file
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package com.baeldung.print2DArrays;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.util.Arrays;
import uk.org.webcompere.systemstubs.SystemOut;
import uk.org.webcompere.systemstubs.annotations.SystemStub;
public class Print2DArrayUnitTest {
@SystemStub
private SystemOut systemOut;
@Test
void whenPrint2D_thenUseNested() {
int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
for (int i = 0; i < myArray.length; i++) {
for (int j = 0; j < myArray[i].length; j++) {
System.out.print(myArray[i][j] + " ");
}
System.out.println();
}
String expectedOutput = "1 2 3 \n4 5 6 \n7 8 9 \n";
assertThat(systemOut.getLines()).containsExactly(expectedOutput);
}
@Test
public void whenPrint2D_thenUseStream() {
int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
Arrays.stream(myArray) .flatMapToInt(Arrays::stream) .forEach(num -> System.out.print(num + " "));
String expectedOutput = "1 2 3 4 5 6 7 8 9";
assertThat(systemOut.getLines()).containsExactly(expectedOutput);
}
@Test
public void whenPrint2D_thenUseDeepToString() {
int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
System.out.println(Arrays.deepToString(myArray));
String expectedOutput = "[[1, 2, 3], [4, 5, 6], [7, 8, 9]]";
assertThat(systemOut.getLines()).containsExactly(expectedOutput);
}
@Test
public void whenPrint2D_thenUseArrayToString() {
int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
for (int[] row : myArray) {
System.out.println(Arrays.toString(row));
}
String expectedOutput = "[1, 2, 3]\n[4, 5, 6]\n[7, 8, 9]\n";
assertThat(systemOut.getLines()).containsExactly(expectedOutput);
}
}