Improve temporary file deletion in YamlConfig and FileManager tests

The SongodaYamlConfig might create a backup config file when upgrading a
configuration into a newer version.
This file would not get deleted in the old implementation

Core/src/test/java/com/songoda/core/configuration/songoda/SongodaYamlConfigRoundtripTest.java

@@ -9,36 +9,41 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.stream.Stream;
 
 import static org.junit.jupiter.api.Assertions.*;
 
 class SongodaYamlConfigRoundtripTest {
-    Path cfg;
+    private Path testDirectoryPath;
 
     @BeforeEach
     void setUp() throws IOException {
-        Path path = Files.createTempFile("SongodaYamlConfigTest", "yml");
-        File file = path.toFile();
-        file.deleteOnExit();
-
-        this.cfg = path;
+        this.testDirectoryPath = Files.createTempDirectory("SongodaCore-YamlConfigRoundtripTest");
+        this.testDirectoryPath.toFile().deleteOnExit();
     }
 
     @AfterEach
     void tearDown() throws IOException {
-        Files.deleteIfExists(this.cfg);
+        try (Stream<Path> paths = Files.list(this.testDirectoryPath)) {
+            for (Path path : paths.toArray(Path[]::new)) {
+                Files.deleteIfExists(path);
+            }
+        }
+        Files.deleteIfExists(this.testDirectoryPath);
     }
 
     @Test
     void roundtripTest() throws IOException {
-        Files.write(this.cfg, ("# Don't touch this – it's used to track the version of the config.\n" +
+        Path testFilePath = this.testDirectoryPath.resolve("config.yml");
+
+        Files.write(testFilePath, ("# Don't touch this – it's used to track the version of the config.\n" +
                 "version: 1\n" +
                 "messages:\n" +
                 "  # This message is shown when the 'foo' command succeeds.\n" +
                 "  fooSuccess: Remastered success value\n" +
                 "# This is the range of the 'foo' command\n").getBytes());
 
-        SongodaYamlConfig cfg = new SongodaYamlConfig(this.cfg.toFile())
+        SongodaYamlConfig cfg = new SongodaYamlConfig(testFilePath.toFile())
                 .withVersion(3);
 
         ConfigEntry cmdFooSuccess = cfg.createEntry("command.foo.success", "Default success value")
@@ -94,6 +99,6 @@ class SongodaYamlConfigRoundtripTest {
                 "# This is the incrementer of the 'foo' command\n" +
                 "incrementer: 0\n" +
                 "# This is the entry without an upgrade step\n" +
-                "entryWithoutUpgradeStep: Default value\n", new String(Files.readAllBytes(this.cfg)));
+                "entryWithoutUpgradeStep: Default value\n", new String(Files.readAllBytes(testFilePath)));
     }
 }

Core/src/test/java/com/songoda/core/locale/LocaleFileManagerTest.java

@@ -13,32 +13,35 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.List;
-import java.util.Objects;
+import java.util.stream.Stream;
 
 class LocaleFileManagerTest {
     private final byte[] validIndexFile = ("# This is a comment\n\nen_US.lang\nen.yml\nde.txt\n").getBytes(StandardCharsets.UTF_8);
 
-    private File testDirectory;
+    private Path testDirectoryPath;
 
     @BeforeEach
     void setUp() throws IOException {
-        this.testDirectory = Files.createTempDirectory("SongodaCore-LocaleFileManagerTest").toFile();
-        this.testDirectory.deleteOnExit();
+        this.testDirectoryPath = Files.createTempDirectory("SongodaCore-LocaleFileManagerTest");
+        this.testDirectoryPath.toFile().deleteOnExit();
     }
 
     @AfterEach
     void tearDown() throws IOException {
-        for (File file : Objects.requireNonNull(this.testDirectory.listFiles())) {
-            Files.deleteIfExists(file.toPath());
+        try (Stream<Path> paths = Files.list(this.testDirectoryPath)) {
+            for (Path path : paths.toArray(Path[]::new)) {
+                Files.deleteIfExists(path);
             }
-        Files.deleteIfExists(this.testDirectory.toPath());
+        }
+        Files.deleteIfExists(this.testDirectoryPath);
     }
 
     @Test
     void downloadMissingTranslations_EmptyTargetDir() throws IOException {
         Plugin plugin = Mockito.mock(Plugin.class);
-        Mockito.when(plugin.getDataFolder()).thenReturn(this.testDirectory);
+        Mockito.when(plugin.getDataFolder()).thenReturn(this.testDirectoryPath.toFile());
 
         MockHttpClient httpClient = new MockHttpClient(new MockHttpResponse(200, this.validIndexFile));
         LocaleFileManager localeFileManager = new LocaleFileManager(httpClient, "test");
@@ -64,7 +67,7 @@ class LocaleFileManagerTest {
     @Test
     void downloadMissingTranslations() throws IOException {
         Plugin plugin = Mockito.mock(Plugin.class);
-        Mockito.when(plugin.getDataFolder()).thenReturn(this.testDirectory);
+        Mockito.when(plugin.getDataFolder()).thenReturn(this.testDirectoryPath.toFile());
 
         Files.createDirectories(plugin.getDataFolder().toPath());
         Files.createFile(new File(plugin.getDataFolder(), "en_US.lang").toPath());