MultibaseBadInputsTest.java

package io.multibase;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;

import java.util.Arrays;
import java.util.Collection;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

public class MultibaseBadInputsTest {

  public static Collection<String> data() {
    return Arrays.asList(
        "f012", // Hex string of odd length, not allowed in Base16
        "f0g", // 'g' char is not allowed in Base16
        "zt1Zv2yaI", // 'I' char is not allowed in Base58
        "2", // '2' is not a valid encoding marker
        "", // Empty string is not a valid multibase
        "🚀🫕" // This Emoji (Swiss Fondue) is not part of the Base256Emoji table
        );
  }

  @MethodSource("data")
  @ParameterizedTest(name = "{index}: \"{0}\"")
  public void badInputTest(String input) {
    assertThrows(
        IllegalArgumentException.class,
        () -> {
          Multibase.decode(input);
        });
  }

  public static Collection<String> invalidPrefix() {
    return Arrays.asList(
        "2", // '2' is not a valid encoding marker
        "", // Empty string is not a valid multibase
        "🫕🚀" // This not a valid Emoji Multibase (note how it's inverted)
        );
  }

  @MethodSource("invalidPrefix")
  @ParameterizedTest(name = "{index}: \"{0}\"")
  public void invalidPrefix(String input) {
    assertFalse(Multibase.hasValidPrefix(input));
  }
}