Improve StatementParserTests error message

test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java

@@ -2713,6 +2713,20 @@ public static <T extends Throwable> T expectThrows(Class<T> expectedType, Matche
         return e;
     }
 
+    /**
+     * Checks a specific exception class with matched message is thrown by the given runnable, and returns it.
+     */
+    public static <T extends Throwable> T expectThrows(
+        String reason,
+        Class<T> expectedType,
+        Matcher<String> messageMatcher,
+        ThrowingRunnable runnable
+    ) {
+        var e = expectThrows(expectedType, reason, runnable);
+        assertThat(reason, e.getMessage(), messageMatcher);
+        return e;
+    }
+
     /**
      * Same as {@link #runInParallel(int, IntConsumer)} but also attempts to start all tasks at the same time by blocking execution on a
      * barrier until all threads are started and ready to execute their task.

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/IdentifierGenerator.java

@@ -90,8 +90,7 @@ public static String randomIndexPattern(Feature... features) {
             var cluster = maybeQuote(randomIdentifier());
             pattern = maybeQuote(cluster + ":" + pattern);
         } else if (EsqlCapabilities.Cap.INDEX_COMPONENT_SELECTORS.isEnabled() && canAdd(Features.INDEX_SELECTOR, features)) {
-            var selector = ESTestCase.randomFrom(IndexComponentSelector.values());
-            pattern = maybeQuote(pattern + "::" + selector.getKey());
+            pattern = maybeQuote(pattern + "::" + randomFrom(IndexComponentSelector.values()).getKey());
         }
         return pattern;
     }

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/parser/AbstractStatementParserTests.java

@@ -140,22 +140,25 @@ static MapExpression mapExpression(Map<String, Object> keyValuePairs) {
     }
 
     void expectError(String query, String errorMessage) {
-        ParsingException e = expectThrows(ParsingException.class, "Expected syntax error for " + query, () -> statement(query));
-        assertThat(e.getMessage(), containsString(errorMessage));
-    }
-
-    void expectVerificationError(String query, String errorMessage) {
-        VerificationException e = expectThrows(VerificationException.class, "Expected syntax error for " + query, () -> statement(query));
-        assertThat(e.getMessage(), containsString(errorMessage));
+        expectError(query, null, errorMessage);
     }
 
     void expectError(String query, List<QueryParam> params, String errorMessage) {
-        ParsingException e = expectThrows(
+        expectThrows(
+            "Query [" + query + "] is expected to throw " + ParsingException.class + " with message [" + errorMessage + "]",
             ParsingException.class,
-            "Expected syntax error for " + query,
+            containsString(errorMessage),
             () -> statement(query, new QueryParams(params))
         );
-        assertThat(e.getMessage(), containsString(errorMessage));
+    }
+
+    void expectVerificationError(String query, String errorMessage) {
+        expectThrows(
+            "Query [" + query + "] is expected to throw " + VerificationException.class + " with message [" + errorMessage + "]",
+            VerificationException.class,
+            containsString(errorMessage),
+            () -> parser.createStatement(query)
+        );
     }
 
     void expectInvalidIndexNameErrorWithLineNumber(String query, String indexString, String lineNumber) {