Separate unit-test data from integ-test samples

- Upgraded `samples/basic` to use latest Gradle version.

__tests__/data/crypto-utils-test/src/test/java/basic/BasicTest.java

@@ -0,0 +1,10 @@
+package basic;
+
+import org.junit.Test;
+
+public class BasicTest {
+    @Test
+    public void test() {
+        assert true;
+    }
+}