import org.junit.jupiter.api.BeforeEach;

import org.junit.jupiter.api.Test;

import java.util.Arrays;

import java.util.List;

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

class GrammarExerciseTest {

GrammarExercise grammarExercise;

@BeforeEach

void setUp() {

grammarExercise = new GrammarExercise();

}

@Test

void should_return_common_words_with_space() {

//given

String first = "apple,juice,mother,people,beautiful,apple,dog";

String second = "cat,baby,smile,good,apple,beautiful,Dog,nice";

List<String> expected = Arrays.asList("A P P L E", "B E A U T I F U L", "D O G");

//when

List<String> result = grammarExercise.findCommonWordsWithSpace(first, second);

//then

assertIterableEquals(result, expected);

}

@Test

void should_throw_exception_when_input_has_two_comma() {

//given

String first = "apple,,juice,mother,people,beautiful,apple,dog";

String second = "cat,baby,smile,good,apple,beautiful,Dog,nice";

//when&then

assertThrows(RuntimeException.class, () -> {

grammarExercise.findCommonWordsWithSpace(first, second);

});

}

@Test

void should_throw_exception_when_input_contains_invalid_symbol() {

//given

String first = "apple,juice,mother,people,bea&&utiful,apple,dog";

String second = "cat,baby,smile,good,apple,bea&&utiful,Dog,nice";

//when&then

assertThrows(RuntimeException.class, () -> {

grammarExercise.findCommonWordsWithSpace(first, second);

});

}

}