Uebung-Tannenbaum/src/test/java/de/edu/hsfulda/ciip/tdd/TannenbaumUiTest.java

package de.edu.hsfulda.ciip.tdd;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.Arrays;
import java.util.List;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InOrder;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
class TannenbaumUiTest {

	@Mock
	PrintStream output;

	@Mock
	InputStream input;

	@Test
	void parseUserInputToInteger() throws IOException {
		Mockito.doReturn(1).when(input).available();
		Mockito.doReturn((int) '7').when(input).read();
		int expected = 7;

		int treeSize = new TannenbaumUi(input, output).getTreeSize();

		assertEquals(expected, treeSize, "tree size");

		InOrder inOrder = Mockito.inOrder(input, output);

		inOrder.verify(output).println(TannenbaumUi.TREE_SIZE_PROMPT);
		inOrder.verify(input).available();
	}

	@Test
	void parseUserInputToInteger2() throws IOException {
		Mockito.doReturn(1).when(input).available();
		Mockito.doReturn((int) '9').when(input).read();
		int expected = 9;

		int treeSize = new TannenbaumUi(input, output).getTreeSize();

		assertEquals(expected, treeSize, "tree size");
	}

	@Test
	void parseUserInputToInteger2Digits() throws IOException {
		Mockito.doReturn(2).when(input).available();
		Mockito.doReturn((int) '3').doReturn((int) '5').when(input).read();
		int expected = 35;

		int treeSize = new TannenbaumUi(input, output).getTreeSize();

		assertEquals(expected, treeSize, "tree size");
	}

	@Test
	void writeSingleLine() throws Exception {
		String message = "hello world";

		new TannenbaumUi(input, output).print(Arrays.asList(message));

		Mockito.verify(output).println(message);
	}

	@Test
	void writeMultipeleLines() throws Exception {
		List<String> messageLines = Arrays.asList("hello", "world");

		new TannenbaumUi(input, output).print(messageLines);

		Mockito.verify(output).println(messageLines.get(0));
		Mockito.verify(output).println(messageLines.get(1));
	}
}