poi/src/test/java/org/apache/poi/ss/formula/functions/TestTrim.java

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   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.ss.formula.functions;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.apache.poi.ss.formula.eval.BlankEval;
import org.apache.poi.ss.formula.eval.BoolEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.junit.jupiter.api.Test;

/**
 * Tests for Excel function TRIM()
 */
final class TestTrim {


	private static ValueEval invokeTrim(ValueEval text) {
		ValueEval[] args = new ValueEval[] { text, };
		return TextFunction.TRIM.evaluate(args, -1, (short)-1);
	}

	private void confirmTrim(ValueEval text, String expected) {
		ValueEval result = invokeTrim(text);
		assertEquals(StringEval.class, result.getClass());
		assertEquals(expected, ((StringEval)result).getStringValue());
	}

	private void confirmTrim(ValueEval text, ErrorEval expectedError) {
		ValueEval result = invokeTrim(text);
		assertEquals(ErrorEval.class, result.getClass());
		assertEquals(expectedError.getErrorCode(), ((ErrorEval)result).getErrorCode());
	}

	@Test
	void testBasic() {

		confirmTrim(new StringEval(" hi "), "hi");
		confirmTrim(new StringEval("hi "), "hi");
		confirmTrim(new StringEval("  hi"), "hi");
		confirmTrim(new StringEval(" hi there  "), "hi there");
		confirmTrim(new StringEval(""), "");
		confirmTrim(new StringEval("   "), "");
	}

	/**
	 * Valid cases where text arg is not exactly a string
	 */
	@Test
	void testUnusualArgs() {

		// text (first) arg type is number, other args are strings with fractional digits
		confirmTrim(new NumberEval(123456), "123456");
		confirmTrim(BoolEval.FALSE, "FALSE");
		confirmTrim(BoolEval.TRUE, "TRUE");
		confirmTrim(BlankEval.instance, "");
	}

	@Test
	void testErrors() {
		confirmTrim(ErrorEval.NAME_INVALID, ErrorEval.NAME_INVALID);
	}
}