Merge pull request eugenp#6119 from FDPro/master

dupirefr/[email protected] [BAEL-2531] Directories creation tests

core-java-io/src/test/java/com/baeldung/directories/NewDirectoryUnitTest.java

@@ -0,0 +1,100 @@
+package com.baeldung.directories;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.File;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class NewDirectoryUnitTest {
+
+    private static final File TEMP_DIRECTORY = new File(System.getProperty("java.io.tmpdir"));
+
+    @Before
+    public void beforeEach() {
+        File newDirectory = new File(TEMP_DIRECTORY, "new_directory");
+        File nestedInNewDirectory = new File(newDirectory, "nested_directory");
+        File existingDirectory = new File(TEMP_DIRECTORY, "existing_directory");
+        File existingNestedDirectory = new File(existingDirectory, "existing_nested_directory");
+        File nestedInExistingDirectory = new File(existingDirectory, "nested_directory");
+
+        nestedInNewDirectory.delete();
+        newDirectory.delete();
+        nestedInExistingDirectory.delete();
+        existingDirectory.mkdir();
+        existingNestedDirectory.mkdir();
+    }
+
+    @Test
+    public void givenUnexistingDirectory_whenMkdir_thenTrue() {
+        File newDirectory = new File(TEMP_DIRECTORY, "new_directory");
+        assertFalse(newDirectory.exists());
+
+        boolean directoryCreated = newDirectory.mkdir();
+
+        assertTrue(directoryCreated);
+    }
+
+    @Test
+    public void givenExistingDirectory_whenMkdir_thenFalse() {
+        File newDirectory = new File(TEMP_DIRECTORY, "new_directory");
+        newDirectory.mkdir();
+        assertTrue(newDirectory.exists());
+
+        boolean directoryCreated = newDirectory.mkdir();
+
+        assertFalse(directoryCreated);
+    }
+
+    @Test
+    public void givenUnexistingNestedDirectories_whenMkdir_thenFalse() {
+        File newDirectory = new File(TEMP_DIRECTORY, "new_directory");
+        File nestedDirectory = new File(newDirectory, "nested_directory");
+        assertFalse(newDirectory.exists());
+        assertFalse(nestedDirectory.exists());
+
+        boolean directoriesCreated = nestedDirectory.mkdir();
+
+        assertFalse(directoriesCreated);
+    }
+
+    @Test
+    public void givenUnexistingNestedDirectories_whenMkdirs_thenTrue() {
+        File newDirectory = new File(TEMP_DIRECTORY, "new_directory");
+        File nestedDirectory = new File(newDirectory, "nested_directory");
+        assertFalse(newDirectory.exists());
+        assertFalse(nestedDirectory.exists());
+
+        boolean directoriesCreated = nestedDirectory.mkdirs();
+
+        assertTrue(directoriesCreated);
+    }
+
+    @Test
+    public void givenExistingParentDirectories_whenMkdirs_thenTrue() {
+        File newDirectory = new File(TEMP_DIRECTORY, "existing_directory");
+        newDirectory.mkdir();
+        File nestedDirectory = new File(newDirectory, "nested_directory");
+        assertTrue(newDirectory.exists());
+        assertFalse(nestedDirectory.exists());
+
+        boolean directoriesCreated = nestedDirectory.mkdirs();
+
+        assertTrue(directoriesCreated);
+    }
+
+    @Test
+    public void givenExistingNestedDirectories_whenMkdirs_thenFalse() {
+        File existingDirectory = new File(TEMP_DIRECTORY, "existing_directory");
+        File existingNestedDirectory = new File(existingDirectory, "existing_nested_directory");
+        assertTrue(existingDirectory.exists());
+        assertTrue(existingNestedDirectory.exists());
+
+        boolean directoriesCreated = existingNestedDirectory.mkdirs();
+
+        assertFalse(directoriesCreated);
+    }
+
+}