Add test for relativize

Author: sungshik

src/test/java/engineering/swat/watch/impl/EventHandlingWatchTests.java

@@ -0,0 +1,67 @@
+/*
+ * BSD 2-Clause License
+ *
+ * Copyright (c) 2023, Swat.engineering
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package engineering.swat.watch.impl;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+import org.junit.jupiter.api.Test;
+
+import engineering.swat.watch.WatchEvent;
+
+class EventHandlingWatchTests {
+
+    private static EventHandlingWatch emptyWatch(Path path) {
+        return new EventHandlingWatch() {
+            @Override
+            public void handleEvent(WatchEvent event) {
+                // Nothing to handle
+            }
+
+            @Override
+            public void close() throws IOException {
+                // Nothing to close
+            }
+
+            @Override
+            public Path getPath() {
+                return path;
+            }
+        };
+    }
+
+    @Test
+    void relativizeTest() {
+        var e1 = new WatchEvent(WatchEvent.Kind.OVERFLOW, Path.of("foo"), Path.of("bar", "baz.txt"));
+        var e2 = new WatchEvent(WatchEvent.Kind.OVERFLOW, Path.of("foo", "bar", "baz.txt"));
+        var e3 = emptyWatch(Path.of("foo")).relativize(e2);
+        assertEquals(e1.getRootPath(), e3.getRootPath());
+        assertEquals(e1.getRelativePath(), e3.getRelativePath());
+    }
+}