test: create `_TemplateStdlibTest` to help test of `tim/stdlib`

test/net/sourceforge/plantuml/tim/stdlib/_TemplateStdlibTest.template

@@ -0,0 +1,59 @@
+package net.sourceforge.plantuml.tim.stdlib;
+
+import static net.sourceforge.plantuml.test.JunitUtils.StringJsonConverter;
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutput;
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutputFromInput;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayNameGenerator.ReplaceUnderscores;
+import org.junit.jupiter.api.IndicativeSentencesGeneration;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.converter.ConvertWith;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+import net.sourceforge.plantuml.json.JsonValue;
+import net.sourceforge.plantuml.tim.EaterException;
+import net.sourceforge.plantuml.tim.EaterExceptionLocated;
+import net.sourceforge.plantuml.tim.TFunction;
+
+/**
+ * Tests the builtin function.
+ */
+@IndicativeSentencesGeneration(separator = ": ", generator = ReplaceUnderscores.class)
+
+// Change `XXX` by the name of the tim.stdlib Class Under Test
+@Disabled
+class XXXTest {
+	TFunction cut = new XXX();
+	final String cutName = "XXX";
+
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "0"); // Change expetected value here
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0, 0", // Put test values here
+	})
+	void Test_with_String(String input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0, 0", // Put test values here
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(value = {
+			" 0, 0", // Put test values here
+	})
+	void Test_with_Json(@ConvertWith(StringJsonConverter.class) JsonValue input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}