Add tests for the writing examples

jhdf/src/test/java/io/jhdf/examples/WriteAttributesTest.java

@@ -0,0 +1,19 @@
+package io.jhdf.examples;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class WriteAttributesTest {
+	@Test
+	void testWriteAttributes() {
+		assertDoesNotThrow(() ->
+			WriteAttributes.main(new String[]{}));
+
+		assertTrue(Files.exists(Paths.get("attributes.hdf5")));
+	}
+}

jhdf/src/test/java/io/jhdf/examples/WriteHdf5Test.java

@@ -0,0 +1,20 @@
+package io.jhdf.examples;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class WriteHdf5Test {
+
+	@Test
+	void testWriteHdf5() {
+		assertDoesNotThrow(() ->
+			WriteHdf5.main(new String[]{}));
+
+		assertTrue(Files.exists(Paths.get("jhdf.hdf5")));
+	}
+}