Bordcomputer/src/test/java/BordComputerTest.java

import device.Device;
import device.radioPlayer.RadioPlayer;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Properties;
import java.util.stream.Stream;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.*;

class BordComputerTest {

    @ParameterizedTest
    @MethodSource("readConfigOptions")
    void readConfigTest(String testName, String testTyp, BordComputer testBc, String expectedResult) {
        if (testTyp.equals("count")) {
            assertThat(fileReaderCount()).describedAs(testName).isEqualTo(testBc.deviceNames.length);
        }
        if (testTyp.equals("count1")) {
            assertThat(fileReaderCount()).describedAs(testName).isEqualTo(testBc.installedDevices.length);
        }
        if (testTyp.equals("item1")) {
            assertThat(testBc.deviceNames[0]).describedAs(testName).isEqualTo(expectedResult);
        }
        if (testTyp.equals("item2")) {
            assertThat(testBc.deviceNames[1]).describedAs(testName).isEqualTo(expectedResult);
        }
        if (testTyp.equals("item3")) {
            assertThat(testBc.deviceNames[2]).describedAs(testName).isEqualTo(expectedResult);
        }
    }

    static Stream<Arguments> readConfigOptions() {
        BordComputer bc1 = new BordComputer();
        bc1.readConfig();

        return Stream.of(
                Arguments.of("Check if file reader is getting every item in Geraete.config", "count", bc1, ""),
                Arguments.of("Check if file reader is getting the first element", "item1", bc1, "device.cdPlayer.CDPlayer"),
                Arguments.of("Check if file reader is getting the second element", "item2", bc1, "device.radioPlayer.RadioPlayer"),
                Arguments.of("Check if file reader is getting the third element", "item3", bc1, "device.usbPlayer.UsbPlayer"),
                Arguments.of("Test if installed devices has the length", "count1", bc1, "")
        );
    }

    @ParameterizedTest
    @MethodSource("setDevicesOptions")
    void setDevicesTest(String testName, BordComputer testBc) {
        Device dev = testBc.installedDevices[0];
        assertThat(dev).describedAs(testName).isNotEqualTo(null);
    }

    static Stream<Arguments> setDevicesOptions() throws ClassNotFoundException, InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {
        BordComputer bc = new BordComputer();
        bc.readConfig();
        bc.setDevices();
        return Stream.of(
                Arguments.of("Test if installedDevices[0] is not null", bc)

        );
    }
    public int fileReaderCount() {
        int count = 0;
        try (FileReader reader = new FileReader("Geraete.config")) {
            Properties properties = new Properties();
            properties.load(reader);
            count = properties.size();
        } catch (IOException e) {
            e.printStackTrace();
        } return count;
    }
}