Draft: [DRIVER-787] Validate SELECT without FROM support

driver-core/src/test/java/com/datastax/driver/core/SelectWithoutFromTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright DataStax, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.datastax.driver.core;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.datastax.driver.core.exceptions.InvalidQueryException;
+import com.datastax.driver.core.exceptions.SyntaxError;
+import org.testng.SkipException;
+import org.testng.annotations.Test;
+
+public class SelectWithoutFromTest extends CCMTestsSupport {
+
+  @Test(groups = "short")
+  public void should_execute_select_without_from() {
+    ResultSet result;
+    try {
+      result = session().execute("SELECT 1");
+    } catch (InvalidQueryException | SyntaxError e) {
+      throw new SkipException("Server does not support SELECT without FROM", e);
+    }
+
+    assertLiteralResult(result);
+    assertNowResult(session().execute("SELECT now()"));
+
+    PreparedStatement prepared = session().prepare("SELECT 1");
+    assertLiteralResult(session().execute(prepared.bind()));
+
+    prepared = session().prepare("SELECT now()");
+    assertNowResult(session().execute(prepared.bind()));
+  }
+
+  private static void assertLiteralResult(ResultSet result) {
+    Row row = result.one();
+    assertThat(row).isNotNull();
+    ColumnDefinitions definitions = result.getColumnDefinitions();
+    assertThat(definitions.size()).isEqualTo(1);
+    assertThat(definitions.getName(0)).isEqualTo("1");
+    assertThat(definitions.getType(0)).isEqualTo(DataType.cint());
+    assertThat(row.getInt(0)).isEqualTo(1);
+  }
+
+  private static void assertNowResult(ResultSet result) {
+    Row row = result.one();
+    assertThat(row).isNotNull();
+    ColumnDefinitions definitions = result.getColumnDefinitions();
+    assertThat(definitions.size()).isEqualTo(1);
+    assertThat(definitions.getName(0)).isEqualTo("now()");
+    assertThat(definitions.getType(0)).isEqualTo(DataType.timeuuid());
+    assertThat(row.getUUID(0)).isNotNull();
+  }
+}