Merge commit '36bca61764984ff5395653cf8377ec5daa71b709' as 'libs/protobuf'

libs/protobuf/java/internal/JavaVersionTest.java

@@ -0,0 +1,22 @@
+// Test that Kokoro is using the expected version of Java.
+import static com.google.common.truth.Truth.assertWithMessage;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class JavaVersionTest {
+  @Test
+  public void testJavaVersion() throws Exception {
+    String exp = System.getenv("KOKORO_JAVA_VERSION");
+    if(exp == null || exp.isEmpty()) {
+      System.err.println("No kokoro java version found, skipping check");
+      return;
+    }
+    String version = System.getProperty("java.version");
+    assertWithMessage("Expected Python " + exp + " but found Python " + version)
+      .that(version.startsWith(exp))
+      .isTrue();
+  }
+}