refactor: revise obsolete kata logic

kata/7-kyu/mew-cipher/main/ForemanPig.java → kata/7-kyu/mew-cipher/main/MewCipher.java

@@ -1,7 +1,7 @@
 import static java.util.stream.Collectors.joining;
 import static java.util.stream.IntStream.range;
 
-interface ForemanPig {
+interface MewCipher {
   static String decipher(String[] code) {
     return range(0, code[0].length())
         .map(i -> range(0, code.length).reduce(0, (s, j) -> s + (code[j].charAt(i) & 31)) / code.length)

kata/7-kyu/mew-cipher/test/MewCipherTest.java

@@ -0,0 +1,14 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class MewCipherTest {
+  @Test
+  void sample() {
+    assertEquals("walk your dog at nine", MewCipher.decipher(new String[]{"u lk zxuq hfk as fouh", "y l  zpuv  xe at sicd", "welvayfuqbfpeaauaqcrc"}));
+    assertEquals("hello world", MewCipher.decipher(new String[]{"hello world"}));
+    assertEquals("", MewCipher.decipher(new String[]{"", "", "", "", ""}));
+    assertEquals("   ", MewCipher.decipher(new String[]{"a  ", " b ", "  c", "   ", "   "}));
+    assertEquals("foreman pig", MewCipher.decipher(new String[]{"foreman pig", "foreman pig"}));
+  }
+}