Add config validators

src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validator/BooleanValidatorTest.java

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+package at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validator;
+
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.ValidationResult;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ConfigProperty;
+import at.pcgamingfreaks.yaml.YAML;
+import at.pcgamingfreaks.yaml.YamlInvalidContentException;
+import org.apache.commons.cli.CommandLineParser;
+import org.apache.commons.cli.DefaultParser;
+import org.apache.commons.cli.Options;
+import org.apache.commons.cli.ParseException;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.stream.Stream;
+
+import static at.pcgamingfreaks.mkvaudiosubtitlechanger.config.ValidationResult.*;
+import static at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ConfigProperty.*;
+import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.CommandLineOptionsUtil.optionOf;
+import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.TestUtil.yamlList;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class BooleanValidatorTest {
+    private static CommandLineParser parser;
+    private static Options options;
+
+    @BeforeAll
+    static void before() {
+        parser = new DefaultParser();
+        options = new Options();
+        options.addOption(optionOf(SAFE_MODE, "s", false));
+    }
+
+    private static Stream<Arguments> provideTestCases() {
+        return Stream.of(
+                Arguments.of(SAFE_MODE, false, "", new String[]{"-safe-mode"}, VALID),
+                Arguments.of(SAFE_MODE, true, "", new String[]{"-safe-mode"}, VALID),
+                Arguments.of(SAFE_MODE, false, "", new String[]{""}, NOT_PRESENT),
+                Arguments.of(SAFE_MODE, true, "", new String[]{""}, MISSING),
+                Arguments.of(SAFE_MODE, false, yamlList(ARGUMENTS, SAFE_MODE), new String[]{""}, VALID),
+                Arguments.of(SAFE_MODE, true, yamlList(ARGUMENTS, SAFE_MODE), new String[]{""}, VALID),
+                Arguments.of(SAFE_MODE, false, yamlList(ARGUMENTS, WINDOWS), new String[]{""}, NOT_PRESENT),
+                Arguments.of(SAFE_MODE, true, yamlList(ARGUMENTS, WINDOWS), new String[]{""}, MISSING)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("provideTestCases")
+    void validate(ConfigProperty property, boolean required, String yamlArgs, String[] cmdArgs,
+                  ValidationResult expectedResult) throws ParseException, YamlInvalidContentException {
+        BooleanValidator underTest = new BooleanValidator(property, required);
+
+        ValidationResult result = underTest.validate(new YAML(yamlArgs), parser.parse(options, cmdArgs));
+
+        assertEquals(expectedResult, result);
+    }
+}

src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/TestUtil.java

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+package at.pcgamingfreaks.mkvaudiosubtitlechanger.util;
+
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ConfigProperty;
+
+import java.util.Arrays;
+
+import static java.util.stream.Collectors.joining;
+
+public class TestUtil {
+    public static String yamlList(ConfigProperty main, ConfigProperty... child) {
+        return main.prop() + ":\n" + Arrays.stream(child)
+                .map(ConfigProperty::prop)
+                .collect(joining("\n", "  - ", ""));
+    }
+
+}