tests for eventType check

telemetry_core/src/test/java/com/newrelic/telemetry/events/EventTest.java

@@ -0,0 +1,29 @@
+package com.newrelic.telemetry.events;
+
+import com.newrelic.telemetry.Attributes;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class EventTest {
+
+  @Test
+  void testNullEventType() {
+    assertThrows(
+        IllegalArgumentException.class,
+        () -> {
+          new Event(
+              new Event(null, new Attributes().put("key1", "val1"), System.currentTimeMillis()));
+        });
+  }
+
+  @Test
+  void testEmptyStringEventType() {
+    assertThrows(
+        IllegalArgumentException.class,
+        () -> {
+          new Event(
+              new Event("", new Attributes().put("key2", "val2"), System.currentTimeMillis()));
+        });
+  }
+}