Follow-up to previous commit

Author: Bret McGuire

core/src/test/java/com/datastax/oss/driver/internal/core/DefaultProtocolVersionRegistryTest.java

@@ -24,6 +24,7 @@
 import static com.datastax.oss.driver.internal.core.DefaultProtocolFeature.DATE_TYPE;
 import static com.datastax.oss.driver.internal.core.DefaultProtocolFeature.SMALLINT_AND_TINYINT_TYPES;
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import com.datastax.dse.driver.api.core.DseProtocolVersion;
 import com.datastax.dse.driver.api.core.metadata.DseNodeProperties;
@@ -51,6 +52,15 @@ public void should_find_version_by_name() {
     assertThat(registry.fromName("DSE_V1")).isEqualTo(DseProtocolVersion.DSE_V1);
   }
 
+
+  @Test
+  public void should_fail_to_find_version_by_name_different_case() {
+    assertThatThrownBy(() -> registry.fromName("v4")).isInstanceOf(IllegalArgumentException.class);
+    assertThatThrownBy(() -> registry.fromName("dse_v1")).isInstanceOf(IllegalArgumentException.class);
+    assertThatThrownBy(() -> registry.fromName("dDSE_v1")).isInstanceOf(IllegalArgumentException.class);
+    assertThatThrownBy(() -> registry.fromName("dse_v1")).isInstanceOf(IllegalArgumentException.class);
+  }
+
   @Test
   public void should_downgrade_if_lower_version_available() {
     Optional<ProtocolVersion> downgraded = registry.downgrade(V4);

manual/core/native_protocol/README.md

@@ -62,12 +62,14 @@ the [configuration](../configuration/):
 ```
 datastax-java-driver {
   advanced.protocol {
-    # The V in the version parameter must be capitalized
     version = V3
   }
 }
 ```
 
+Note that the protocol version you specify above is case sensitive so make sure to only use uppercase letters.
+"V3" is correct, "v3" is not.
+
 If you force a version that is too high for the server, you'll get an error:
 
 ```