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 * Java implementation of the SciJava Ops matching engine.
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 * Copyright (C) 2016 - 2024 SciJava developers.
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 * modification, are permitted provided that the following conditions are met:
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package org.scijava.ops.engine.eval;

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

import java.util.HashMap;
import java.util.Map;

import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.scijava.function.Functions;
import org.scijava.ops.api.OpEnvironment;
import org.scijava.ops.engine.AbstractTestEnvironment;
import org.scijava.ops.engine.math.MathOpCollection;
import org.scijava.types.Nil;

/**
 * Tests {@link DefaultEval}.
 *
 * @author Curtis Rueden
 */
public class EvalTest extends AbstractTestEnvironment {

	@BeforeAll
	public static void addNeededOps() {
		ops.register(new DefaultEval());
		ops.register(new MathOpCollection());
	}

	@Test
	public void testMath() {
		final Map<String, Object> vars = new HashMap<>();
		vars.put("a", 2);
		vars.put("b", 3);
		vars.put("c", 5);

		var evaluator = ops.op("expression.eval") //
			.input("a+c", ops, vars) //
			.function();

		assertEquals(7., evaluator.apply("a+c", ops, vars));
		assertEquals(3., evaluator.apply("c-a", ops, vars));
		assertEquals(6., evaluator.apply("a*b", ops, vars));
		assertEquals(2.5, evaluator.apply("c/a", ops, vars));
		assertEquals(1., evaluator.apply("c%a", ops, vars));
		assertEquals(17., evaluator.apply("a+b*c", ops, vars));
	}

	@Test
	public void testMathWithoutVars() {
		var result = ops.op("expression.eval") //
			.input("5+2", ops) //
			.apply();

		assertEquals(7., result);
	}

}
