ciip-grp8-password-manager/src/test/java/ResourceApiTest.java

import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

import java.io.*;
import java.nio.charset.StandardCharsets;

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

class ResourceApiTest {

    private static ResourceApi resourceApi;

    @BeforeAll
    static void init() {
        resourceApi = new ResourceApi();
    }

    @Test
    void getFileFromResourceAsStream() throws IOException {
        assertThrowsExactly(IllegalArgumentException.class,
                () -> resourceApi.getFileFromResourceAsStream("does_not_exist"));

        InputStream is = resourceApi.getFileFromResourceAsStream("german_wordlist.txt");

        BufferedReader in = new BufferedReader(new InputStreamReader(is));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine + "\n");
        }
        in.close();

        assertTrue(response.toString().contains("Alleinherrschaft"));
    }

    @Test
    void getStringFromInputStream() throws IOException {
        String testString = "I am a test string!\nAnother test line.\n";
        InputStream is = new ByteArrayInputStream(testString.getBytes(StandardCharsets.UTF_8));
        assertEquals(resourceApi.getStringFromInputStream(is), testString);
    }

    @Test
    void getFileFromResourceAsString() throws IOException {
        assertTrue(resourceApi.getFileFromResourceAsString("german_wordlist.txt").contains("Alleinherrschaft"));
    }
}