Added some tests for the IOUtil class

.woodpecker.yml

@@ -1,4 +1,9 @@
 pipeline:
+  test:
+    image: maven:3-jdk-11
+    commands:
+      - mvn test
+
   build:
     image: maven:3-jdk-11
     commands:

src/main/java/tech/bitgoblin/io/IOUtils.java

@@ -14,9 +14,9 @@ public class IOUtils {
   }
 
   public static String resolveTilda(String path) {
-    if (path.startsWith("~" + File.separator)) {
+    if (path.startsWith("~" + File.separator) || path.equals("~")) {
       path = System.getProperty("user.home") + path.substring(1);
-    } else if (path.startsWith("~")) {
+    } else if ((!path.equals("~")) && path.startsWith("~")) {
       // here you can implement reading homedir of other users if you care
       throw new UnsupportedOperationException("Home dir expansion not implemented for explicit usernames");
     }

src/test/java/tech/bitgoblin/io/IOUtilsTest.java

@@ -0,0 +1,28 @@
+package tech.bitgoblin.io;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import java.io.File;
+
+public class IOUtilsTest {
+
+  @Test
+  public void shouldCreateDirectory() {
+    IOUtils.createDirectory("test-temp.txt");
+    assertTrue(new File("test-temp.txt").exists());
+  }
+
+  @Test
+  public void shouldExpandTilda() {
+    String homeExpanded = IOUtils.resolveTilda("~");
+    assertTrue(!homeExpanded.equals("~"));
+  }
+
+  @Test(expected=UnsupportedOperationException.class)
+  public void shouldFailExpandExplicitTilda() {
+    IOUtils.resolveTilda("~test");
+  }
+
+}