Polishing.

Extend tests.

See #2147

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/dialect/JdbcPostgresDialectUnitTests.java

@@ -17,7 +17,11 @@ package org.springframework.data.jdbc.core.dialect;
 
 import static org.assertj.core.api.Assertions.*;
 
+import java.util.List;
+
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 import org.postgresql.geometric.PGbox;
 import org.postgresql.geometric.PGcircle;
 import org.postgresql.geometric.PGlseg;
@@ -26,28 +30,39 @@ import org.postgresql.geometric.PGpoint;
 import org.postgresql.geometric.PGpolygon;
 import org.postgresql.util.PGobject;
 
+import org.springframework.data.jdbc.core.convert.JdbcCustomConversions;
+
 /**
  * Unit tests for {@link JdbcPostgresDialect}.
  *
  * @author Jens Schauder
+ * @author Mark Paluch
  */
-public class JdbcPostgresDialectUnitTests {
+class JdbcPostgresDialectUnitTests {
 
 	@Test // GH-1065
 	void pgobjectIsConsideredSimple() {
 		assertThat(JdbcPostgresDialect.INSTANCE.simpleTypes()).contains(PGobject.class);
 	}
 
-	@Test // GH-1065
-	void geometricalTypesAreConsideredSimple() {
+	@ParameterizedTest // GH-1065, GH-2147
+	@MethodSource("simpleTypes")
+	void simpleTypesAreConsideredSimple(Class<?> type) {
+
+		JdbcCustomConversions conversions = JdbcCustomConversions.of(JdbcPostgresDialect.INSTANCE, List.of());
+
+		assertThat(conversions.isSimpleType(type)).isTrue();
+		assertThat(conversions.getSimpleTypeHolder().isSimpleType(type)).isTrue();
+	}
 
-		assertThat(JdbcPostgresDialect.INSTANCE.simpleTypes()).contains( //
-				PGpoint.class, //
+	static List<Class<?>> simpleTypes() {
+		return List.of(PGpoint.class, //
 				PGbox.class, //
 				PGcircle.class, //
 				org.postgresql.geometric.PGline.class, //
 				PGpath.class, //
 				PGpolygon.class, //
-				PGlseg.class);
+				PGlseg.class, //
+				PGobject.class);
 	}
 }