[serde-gson,serde-jackson] Unify JSON writer tests

test-utils/serde-json/src/main/java/de/siphalor/tweed5/testutils/serde/json/JsonWriterTest.java

@@ -0,0 +1,81 @@
+package de.siphalor.tweed5.testutils.serde.json;
+
+import de.siphalor.tweed5.dataapi.api.TweedDataWriter;
+import de.siphalor.tweed5.dataapi.api.decoration.TweedDataCommentDecoration;
+import lombok.SneakyThrows;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+import java.io.StringWriter;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public interface JsonWriterTest {
+	TweedDataWriter createPrettyJsonWriter(StringWriter stringWriter);
+
+	@ParameterizedTest
+	@CsvSource(ignoreLeadingAndTrailingWhitespace = false, textBlock = """
+			123,"123"
+			 abc def ," abc def "
+			'line
+			breaks
+			',"line\\nbreaks\\n"
+			"quotes","\\"quotes\\""
+			""")
+	@SneakyThrows
+	default void jsonString(String string, String expected) {
+		var stringWriter = new StringWriter();
+		try (var writer = createPrettyJsonWriter(stringWriter)) {
+			writer.visitString(string);
+		}
+		assertThat(stringWriter.toString()).isEqualTo(expected);
+	}
+
+	@Test
+	@SneakyThrows
+	default void jsonComplex() {
+		var stringWriter = new StringWriter();
+		try (var writer = createPrettyJsonWriter(stringWriter)) {
+			writer.visitMapStart();
+
+			writer.visitDecoration((TweedDataCommentDecoration) () -> "The first is the best!");
+			writer.visitMapEntryKey("first");
+			writer.visitListStart();
+			writer.visitInt(123);
+			writer.visitListStart();
+			writer.visitBoolean(false);
+			writer.visitListEnd();
+			writer.visitListEnd();
+
+			writer.visitDecoration((TweedDataCommentDecoration) () -> "Hello\nWorld");
+			writer.visitDecoration((TweedDataCommentDecoration) () -> "!");
+			writer.visitMapEntryKey("second");
+			writer.visitMapStart();
+			writer.visitMapEntryKey("nested");
+			writer.visitDouble(12.34);
+			writer.visitMapEnd();
+
+			writer.visitMapEnd();
+		}
+
+		assertThat(stringWriter.toString()).isEqualToNormalizingNewlines("""
+				{
+				  "first__comment": "The first is the best!",
+				  "first": [
+				    123,
+				    [
+				      false
+				    ]
+				  ],
+				  "second__comment": [
+				    "Hello",
+				    "World",
+				    "!"
+				  ],
+				  "second": {
+				    "nested": 12.34
+				  }
+				}""");
+	}
+}