Update squeaky clean to use test runner v3 features (#2498)

* Update squeaky clean to use test runner v3 features

* added tag in last test

Author: aldotele

exercises/concept/squeaky-clean/build.gradle

@@ -1,23 +1,22 @@
-apply plugin: "java"
-apply plugin: "eclipse"
-apply plugin: "idea"
-
-// set default encoding to UTF-8
-compileJava.options.encoding = "UTF-8"
-compileTestJava.options.encoding = "UTF-8"
+plugins {
+  id "java"
+}
 
 repositories {
   mavenCentral()
 }
 
 dependencies {
-  testImplementation "junit:junit:4.13"
+  testImplementation platform("org.junit:junit-bom:5.10.0")
+  testImplementation "org.junit.jupiter:junit-jupiter"
   testImplementation "org.assertj:assertj-core:3.15.0"
 }
 
 test {
+  useJUnitPlatform()
+
   testLogging {
-    exceptionFormat = 'full'
+    exceptionFormat = "full"
     showStandardStreams = true
     events = ["passed", "failed", "skipped"]
   }

exercises/concept/squeaky-clean/src/test/java/SqueakyCleanTest.java

@@ -1,65 +1,91 @@
-import org.junit.Test;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 public class SqueakyCleanTest {
 
     @Test
+    @Tag("task:1")
+    @DisplayName("The clean method returns empty string when invoked on empty string")
     public void empty() {
         assertThat(SqueakyClean.clean("")).isEmpty();
     }
 
     @Test
+    @Tag("task:1")
+    @DisplayName("The clean method returns the same string when invoked on a single letter string")
     public void single_letter() {
         assertThat(SqueakyClean.clean("A")).isEqualTo("A");
     }
 
     @Test
+    @Tag("task:1")
+    @DisplayName("The clean method returns the same string when invoked on a string of three letters")
     public void string() {
         assertThat(SqueakyClean.clean("àḃç")).isEqualTo("àḃç");
     }
 
     @Test
+    @Tag("task:1")
+    @DisplayName("The clean method replaces whitespaces with underscores in the middle of the string")
     public void spaces() {
         assertThat(SqueakyClean.clean("my   Id")).isEqualTo("my___Id");
     }
 
     @Test
+    @Tag("task:1")
+    @DisplayName("The clean method replaces leading and trailing whitespaces with underscores")
     public void leading_and_trailing_spaces() {
         assertThat(SqueakyClean.clean(" myId ")).isEqualTo("_myId_");
     }
 
     @Test
+    @Tag("task:2")
+    @DisplayName("The clean method replaces control characters with CTRL")
     public void ctrl() {
         assertThat(SqueakyClean.clean("my\0\r\u007FId")).isEqualTo("myCTRLCTRLCTRLId");
     }
 
     @Test
+    @Tag("task:4")
+    @DisplayName("The clean method returns an empty string when invoked on a string with no letters")
     public void string_with_no_letters() {
         assertThat(SqueakyClean.clean("\uD83D\uDE00\uD83D\uDE00\uD83D\uDE00")).isEmpty();
     }
 
     @Test
-    public void keep_only_letters() {
-        assertThat(SqueakyClean.clean("a1\uD83D\uDE002\uD83D\uDE003\uD83D\uDE00b")).isEqualTo("ab");
-    }
-
-    @Test
+    @Tag("task:3")
+    @DisplayName("The clean method converts kebab to camel case after removing a dash")
     public void kebab_to_camel_case() {
         assertThat(SqueakyClean.clean("à-ḃç")).isEqualTo("àḂç");
     }
 
     @Test
+    @Tag("task:3")
+    @DisplayName("The clean method returns a string in camel case after removing a dash and a number")
     public void kebab_to_camel_case_no_letter() {
         assertThat(SqueakyClean.clean("a-1C")).isEqualTo("aC");
     }
 
     @Test
+    @Tag("task:4")
+    @DisplayName("The clean method removes all characters that are not letters")
+    public void keep_only_letters() {
+        assertThat(SqueakyClean.clean("a1\uD83D\uDE002\uD83D\uDE003\uD83D\uDE00b")).isEqualTo("ab");
+    }
+
+    @Test
+    @Tag("task:5")
+    @DisplayName("The clean method removes all lowercase greek letters")
     public void omit_lower_case_greek_letters() {
         assertThat(SqueakyClean.clean("MyΟβιεγτFinder")).isEqualTo("MyΟFinder");
     }
 
     @Test
+    @Tag("task:5")
+    @DisplayName("The clean method returns the correct result after performing a few cleaning operations")
     public void combine_conversions() {
         assertThat(SqueakyClean.clean("9 -abcĐ\uD83D\uDE00ω\0")).isEqualTo("_AbcĐCTRL");
     }