Add test for SimpleHttpClient and https

org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/SimpleHTTPClientTest.java

@@ -0,0 +1,23 @@
+package org.hl7.fhir.utilities;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class SimpleHTTPClientTest {
+  @Test
+  public void testSimpleHTTPClient() throws IOException {
+
+    SimpleHTTPClient http = new SimpleHTTPClient();
+    String url = "https://hl7.org/fhir/us/core/package-list.json?nocache=" + System.currentTimeMillis();
+
+    SimpleHTTPClient.HTTPResult res = http.get(url, "application/json");
+
+    System.out.println(res.getCode());
+    System.out.println(new String(res.getContent(), StandardCharsets.UTF_8));
+    assertTrue(res.getCode() != 400);
+  }
+}