feat: kata/regex-password-validation

Author: ParanoidUser

kata/5-kyu/regex-password-validation/README.md

@@ -6,4 +6,4 @@ You need to write regex that will validate a password to make sure it meets the
 * contains a lowercase letter
 * contains an uppercase letter
 * contains a digit
-* only contains alphanumeric characters (note that `'_'` is not alphanumeric)
+* only contains alphanumeric characters (note that `'_'` is not alphanumeric)

kata/5-kyu/regex-password-validation/main/PasswordRegex.java

@@ -0,0 +1,3 @@
+interface PasswordRegex {
+  String REGEX = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)[a-zA-Z\\d]{6,}$";
+}

kata/5-kyu/regex-password-validation/test/SolutionTest.java

@@ -0,0 +1,41 @@
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class SolutionTest {
+    @ParameterizedTest
+    @ValueSource(strings = {
+        "fjd3IR9",
+        "4fdg5Fj3",
+        "djI38D55",
+        "123abcABC",
+        "ABC123abc",
+        "Password123"
+    })
+    void valid(String password) {
+        assertTrue(password.matches(PasswordRegex.REGEX));
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {
+        "ghdfj32",
+        "DSJKHD23",
+        "dsF43",
+        "DHSJdhjsU",
+        "fjd3IR9.;",
+        "fjd3  IR9",
+        "djI3_8D55",
+        "@@",
+        "JHD5FJ53",
+        "!fdjn345",
+        "jfkdfj3j",
+        "123",
+        "abc",
+        ""
+    })
+    void invalid(String password) {
+        assertFalse(password.matches(PasswordRegex.REGEX));
+    }
+}