test: first commit for some unit tests of tim/stdlib functions

- `AlwaysFalse`
  - `AlwaysTrue`
  - `Dec2hex`
  - `Feature`
  - `GetJsonKey`
  - `GetJsonType`
  - `Hex2dec`
  - `Lower`
  - `Size`
  - `Upper`
  - TBC...

test/net/sourceforge/plantuml/tim/stdlib/AlwaysFalseTest.java

@@ -0,0 +1,50 @@
+package net.sourceforge.plantuml.tim.stdlib;
+
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutput;
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutputFromInput;
+
+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.tim.EaterException;
+import net.sourceforge.plantuml.tim.EaterExceptionLocated;
+import net.sourceforge.plantuml.tim.TFunction;
+
+/**
+ * Tests the builtin function.
+ */
+@IndicativeSentencesGeneration(separator = ": ", generator = ReplaceUnderscores.class)
+
+class AlwaysFalseTest {
+	TFunction cut = new AlwaysFalse();
+	final String cutName = "AlwaysFalse";
+
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "0");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0     , 0 ",
+			" 1     , 0 ",
+			" 'a'   , 0 ",
+	})
+	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 ",
+			" 1     , 0 ",
+			" 123   , 0 ",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/AlwaysTrueTest.java

@@ -0,0 +1,50 @@
+package net.sourceforge.plantuml.tim.stdlib;
+
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutput;
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutputFromInput;
+
+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.tim.EaterException;
+import net.sourceforge.plantuml.tim.EaterExceptionLocated;
+import net.sourceforge.plantuml.tim.TFunction;
+
+/**
+ * Tests the builtin function.
+ */
+@IndicativeSentencesGeneration(separator = ": ", generator = ReplaceUnderscores.class)
+
+class AlwaysTrueTest {
+	TFunction cut = new AlwaysTrue();
+	final String cutName = "AlwaysTrue";
+
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "1");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0     , 1 ",
+			" 1     , 1 ",
+			" 'a'   , 1 ",
+	})
+	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     , 1 ",
+			" 1     , 1 ",
+			" 123   , 1 ",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/Dec2hexTest.java

@@ -0,0 +1,58 @@
+package net.sourceforge.plantuml.tim.stdlib;
+
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutput;
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutputFromInput;
+
+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.tim.EaterException;
+import net.sourceforge.plantuml.tim.EaterExceptionLocated;
+import net.sourceforge.plantuml.tim.TFunction;
+
+/**
+ * Tests the builtin function.
+ */
+@IndicativeSentencesGeneration(separator = ": ", generator = ReplaceUnderscores.class)
+
+class Dec2hexTest {
+	TFunction cut = new Dec2hex();
+	final String cutName = "Dec2hex";
+
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0     , 0 ",
+			" 1     , 0 ",
+			" 10    , 0 ",
+			" 15    , 0 ",
+			" 16    , 0 ",
+			" 255   , 0 ",
+			" 65535 , 0 ",
+	})
+	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 ",
+			" 1     , 1 ",
+			" 10    , a ",
+			" 15    , f ",
+			" 16    , 10 ",
+			" 255   , ff ",
+			" 65535 , ffff ",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/FeatureTest.java

@@ -0,0 +1,68 @@
+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)
+
+class FeatureTest {
+	TFunction cut = new Feature();
+	final String cutName = "Feature";
+
+	@Disabled
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "0");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" style, 1",
+			" theme, 1",
+			" Style, 1",
+			" Theme, 1",
+			" 0    , 0",
+			" 1    , 0",
+			" abc  , 0",
+
+	})
+	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",
+			" 10, 0",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(value = {
+			" \"style\", 1",
+			" \"theme\", 1",
+			" 0, 0",
+	})
+	void Test_with_Json(@ConvertWith(StringJsonConverter.class) JsonValue input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/GetJsonKeyTest.java

@@ -0,0 +1,73 @@
+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)
+
+class GetJsonKeyTest {
+	TFunction cut = new GetJsonKey();
+	final String cutName = "GetJsonKey";
+
+	@Disabled
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "0");
+	}
+
+	@Disabled // EaterException: Not JSON data
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0, Not JSON data",
+			" a, Not JSON data",
+			" -1, Not JSON data",
+	})
+	void Test_with_String(String input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@Disabled // EaterException: Not JSON data
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0,  Not JSON data",
+			" -1, Not JSON data",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(value = {
+			"  []  , []",
+			" '{\"a\":[1, 2]}'  , [\"a\"]",
+			" '[{\"a\":[1, 2]}]'  , [\"a\"]",
+			" '{\"a\":\"abc\"}' , [\"a\"]",
+			" '[{\"a\":[1, 2]}, {\"b\":[3, 4]}]'  , '[\"a\",\"b\"]'",
+			" '{\"a\":[1, 2], \"b\":\"abc\", \"b\":true}' , '[\"a\",\"b\",\"b\"]'",
+			// TODO: Manage Array with different type inside
+			// Ref.:
+			// - https://datatracker.ietf.org/doc/html/rfc8259#section-5
+			// - https://json-schema.org/understanding-json-schema/reference/array.html
+			//" '[3, \"different\", { \"types\" : \"of values\" }]', [\"types\"]",
+	})
+	void Test_with_Json(@ConvertWith(StringJsonConverter.class) JsonValue input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/GetJsonTypeTest.java

@@ -0,0 +1,73 @@
+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)
+
+class GetJsonTypeTest {
+	TFunction cut = new GetJsonType();
+	final String cutName = "GetJsonType";
+
+	@Disabled
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "0");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0, string",
+			" a, string",
+			" -1, string",
+	})
+	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, number",
+			" -1, number",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(value = {
+			" 0                 , number",
+			" 123               , number",
+			" \"abc\"           , string",
+			" \"string\"        , string",
+			" '[1, 2]'          , array",
+			" '[\"a\", \"b\"]'  , array",
+			" '{\"a\":[1, 2]}'  , object",
+			" '{\"a\":\"abc\"}' , object",
+			" true              , boolean ",
+			" false             , boolean ",
+			" 1                 , number ",
+			" null              , json ",
+			" '{\"a\":[1, 2], \"b\":\"abc\", \"b\":true}' , object",
+	})
+	void Test_with_Json(@ConvertWith(StringJsonConverter.class) JsonValue input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/Hex2decTest.java

@@ -0,0 +1,61 @@
+package net.sourceforge.plantuml.tim.stdlib;
+
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutput;
+import static net.sourceforge.plantuml.tim.TimTestUtils.assertTimExpectedOutputFromInput;
+
+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.tim.EaterException;
+import net.sourceforge.plantuml.tim.EaterExceptionLocated;
+import net.sourceforge.plantuml.tim.TFunction;
+
+/**
+ * Tests the builtin function.
+ */
+@IndicativeSentencesGeneration(separator = ": ", generator = ReplaceUnderscores.class)
+
+class Hex2decTest {
+	TFunction cut = new Hex2dec();
+	final String cutName = "Hex2dec";
+
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "0");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0    , 0 ",
+			" 1    , 1 ",
+			" a    , 10 ",
+			" f    , 15 ",
+			" 10   , 16 ",
+			" ff   , 255 ",
+			" ffff , 65535 ",
+			" ' '  , 0 ",
+			" g    , 0 ",
+			" -g    , 0 ",
+			" à    , 0 ",
+			" -1    , -1 ",
+			" -a    , -10 ",
+	})
+	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 ",
+			" 1    , 1 ",
+			" 10   , 16 ",
+			" -1    , -1 ",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/LowerTest.java

@@ -0,0 +1,76 @@
+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)
+
+class LowerTest {
+	TFunction cut = new Lower();
+	final String cutName = "Lower";
+
+	// TODO: Manage Lower function without param. (today: we observe `Function not found %lower`)
+	@Disabled
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0   , 0 ",
+			" 1   , 1 ",
+			" A   , a ",
+			" a   , a ",
+			" F   , f ",
+			" G   , g ",
+			" É   , é ",
+			" 😀 , 😀 ",
+	})
+	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 ",
+			" 1    , 1 ",
+			" 10   , 10 ",
+			" -1    , -1 ",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(value = {
+			" '{\"a\":[1, 2]}' , '{\"a\":[1,2]}'",
+			" '{\"A\":[1, 2]}' , '{\"a\":[1,2]}'",
+			" '[1, 2]'         , '[1,2]'",
+			" '{\"a\":[1, 2], \"b\":\"abc\", \"b\":true}' , '{\"a\":[1,2],\"b\":\"abc\",\"b\":true}'",
+			" '{\"A\":[1, 2], \"B\":\"ABC\", \"B\":true}' , '{\"a\":[1,2],\"b\":\"abc\",\"b\":true}' ",
+			" true, true"
+			// TODO: See JSON management of TRUE/FALSE
+			//" TRUE             , true ",
+	})
+	void Test_with_Json(@ConvertWith(StringJsonConverter.class) JsonValue input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/SizeTest.java

@@ -0,0 +1,81 @@
+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)
+
+class SizeTest {
+	TFunction cut = new Size();
+	final String cutName = "Size";
+
+	// TODO: Manage `Size` function without param. (today: we observe `Function not found`)
+	@Disabled
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "0");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0          , 1 ",
+			" 1          , 1 ",
+			" 10         , 2 ",
+			" a          , 1 ",
+			" A          , 1 ",
+			" ABC        , 3 ",
+			" '[1, 2]'   , 6 ",
+			" '{[1, 2]}' , 8 ",
+			" à          , 1 ",
+// TODO: fix `Size` to allow Unicode chars, the corresponding tests are here:
+//			" 😀         , 1 ",
+//			" \uD83D\uDE00 , 1",
+	})
+	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 ",
+			" 1    , 0 ",
+			" 10   , 0 ",
+	})
+	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",
+			" \"abc\", 0",
+			" '\"abc\"', 0",
+			" '{\"a\":[1, 2]}' , 1",
+			" '[1, 2]' , 2",
+			" '[\"a\", \"b\"]' , 2",
+			" '{\"a\":[1, 2], \"b\":\"abc\", \"b\":true}' , 3",
+			" true, 0 ",
+			" 1, 0 ",
+			" null, 0 ",
+	})
+	void Test_with_Json(@ConvertWith(StringJsonConverter.class) JsonValue input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

test/net/sourceforge/plantuml/tim/stdlib/UpperTest.java

@@ -0,0 +1,72 @@
+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)
+
+class UpperTest {
+	TFunction cut = new Upper();
+	final String cutName = "Upper";
+
+	// TODO: Manage Upper function without param. (today: we observe `Function not found %upper`)
+	@Disabled
+	@Test
+	void Test_without_Param() throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutput(cut, "");
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")
+	@CsvSource(nullValues = "null", value = {
+			" 0    , 0 ",
+			" 1    , 1 ",
+			" a    , A ",
+			" A    , A ",
+			" f    , F ",
+			" g    , G ",
+			" é    , É ",
+			" 😀  , 😀 ",
+	})
+	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 ",
+			" 1    , 1 ",
+			" 10   , 10 ",
+			" -1    , -1 ",
+	})
+	void Test_with_Integer(Integer input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+
+	@ParameterizedTest(name = "[{index}] " + cutName + "({0}) = {1}")
+	@CsvSource(value = {
+			" '{\"a\":[1, 2]}' , '{\"A\":[1,2]}'",
+			" '[1, 2]'         , '[1,2]'",
+			" '{\"a\":[1, 2], \"b\":\"abc\", \"b\":true}' , '{\"A\":[1,2],\"B\":\"ABC\",\"B\":TRUE}'",
+			" true             , TRUE ",
+	})
+	void Test_with_Json(@ConvertWith(StringJsonConverter.class) JsonValue input, String expected) throws EaterException, EaterExceptionLocated {
+		assertTimExpectedOutputFromInput(cut, input, expected);
+	}
+}

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

@@ -30,7 +30,7 @@ class XXXTest {
 
 	@Test
 	void Test_without_Param() throws EaterException, EaterExceptionLocated {
-		assertTimExpectedOutput(cut, "0"); // Change expetected value here
+		assertTimExpectedOutput(cut, "0"); // Change expected value here
 	}
 
 	@ParameterizedTest(name = "[{index}] " + cutName + "(''{0}'') = {1}")