Add unit tests

Author: komamitsu

schema-loader/build.gradle

@@ -19,6 +19,7 @@ dependencies {
     implementation "com.google.code.gson:gson:${gsonVersion}"
     implementation "info.picocli:picocli:${picocliVersion}"
     testImplementation "org.junit.jupiter:junit-jupiter-api:${junitVersion}"
+    testImplementation "org.junit.jupiter:junit-jupiter-params:${junitVersion}"
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:${junitVersion}"
     testImplementation "org.assertj:assertj-core:${assertjVersion}"
     testImplementation "org.mockito:mockito-core:${mockitoVersion}"