JNI-117 - "export_key", Improve test

test/java/foundation/pEp/jniadapter/test/jni117/TestAlice.java

@@ -6,6 +6,13 @@ import foundation.pEp.pitytest.utils.TestUtils;
 
 import static foundation.pEp.pitytest.TestLogger.log;
 
+// Test for JNI-117 - Key Export
+
+// Tests: For an ad-hoc generated identity "alice" using myself()"
+// - export_key is not throwing
+// - keydata returned is longer than 100 bytes
+// - keydata contains header: "-----BEGIN PGP PBLIC KEY BLOCK-----"
+
 class TestAlice {
     public static void main(String[] args) throws Exception {
         TestSuite.getDefault().setVerbose(true);
@@ -13,7 +20,11 @@ class TestAlice {
 
         new TestUnit<AdapterBaseTestContext>("Test Alice",new AdapterBaseTestContext() , ctx  -> {
             ctx.alice = ctx.engine.myself(ctx.alice);
-            log(new String(ctx.engine.export_key(ctx.alice.fpr)));
+            byte[] keydata = ctx.engine.export_key(ctx.alice.fpr);
+            String keydataStr = new String(keydata);
+            log(keydataStr);
+            assert keydata.length > 100: "returned keydata is too short";
+            assert keydataStr.contains("-----BEGIN PGP PUBLIC KEY BLOCK-----") : "Keydata doesnt contain: -----BEGIN PGP PBLIC KEY BLOCK-----";
         });
 
         TestSuite.getDefault().run();