fix for running microprofile tests in GitHub Action

Author: hendrikebbers

hedera-microprofile/src/main/java/com/openelements/hedera/microprofile/ClientProvider.java

@@ -64,8 +64,7 @@ private HederaNetwork getHederaNetwork() {
             throw new IllegalStateException("network value is null");
         }
         return HederaNetwork.findByName(network)
-                .orElseThrow(() -> new IllegalArgumentException(
-                        "'hedera.network' property must be set to a valid value. Is '" + network + "'"));
+                .orElse(HederaNetwork.CUSTOM);
     }
 
     private Client createClient() {

hedera-microprofile/src/test/java/com/openelements/hedera/microprofile/test/FileClientTests.java

@@ -1,5 +1,6 @@
 package com.openelements.hedera.microprofile.test;
 
+import com.hedera.hashgraph.sdk.FileId;
 import com.openelements.hedera.base.FileClient;
 import com.openelements.hedera.microprofile.ClientProvider;
 import io.helidon.microprofile.tests.junit5.AddBean;
@@ -29,7 +30,14 @@ static void setup() {
 
     @Test
     void testFileClient() throws Exception {
+        //given
+        final byte[] contents = "Hello, Hedera!".getBytes();
         Assertions.assertNotNull(fileClient);
-        fileClient.createFile(new byte[0]);
+
+        //when
+        final FileId fileId = fileClient.createFile(contents);
+
+        //then
+        Assertions.assertNotNull(fileId);
     }
 }