[wpiutil] Fix WPIUtilJNI.now() implementation (#2640)

wpiutil/src/main/native/cpp/jni/WPIUtilJNI.cpp

@@ -27,12 +27,12 @@ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
 JNIEXPORT void JNICALL JNI_OnUnload(JavaVM* vm, void* reserved) {}
 
 /*
- * Class:     edu_wpi_first_networktables_NetworkTablesJNI
+ * Class:     edu_wpi_first_wpiutil_WPIUtilJNI
  * Method:    now
  * Signature: ()J
  */
 JNIEXPORT jlong JNICALL
-Java_edu_wpi_first_networktables_NetworkTablesJNI_now
+Java_edu_wpi_first_wpiutil_WPIUtilJNI_now
   (JNIEnv*, jclass)
 {
   return wpi::Now();

wpiutil/src/test/java/edu/wpi/first/wpiutil/WPIUtilJNITest.java

@@ -0,0 +1,19 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+package edu.wpi.first.wpiutil;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+public class WPIUtilJNITest {
+  @Test
+  public void testNow() {
+    assertDoesNotThrow(WPIUtilJNI::now);
+  }
+}