Move tests from 'samples' to 'test-samples'

spring-boot-cli/test-samples/test.groovy

@@ -0,0 +1,7 @@
+class BookTests {
+	@Test
+	void testBooks() {
+		Book book = new Book(author: "Tom Clancy", title: "Threat Vector")
+		assertEquals("Tom Clancy", book.author)
+	}
+}