53 lines
1.3 KiB
Kotlin
53 lines
1.3 KiB
Kotlin
package prolog.builtins
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import org.junit.jupiter.api.Assertions.*
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import org.junit.jupiter.api.Test
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import prolog.ast.terms.Atom
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import prolog.ast.terms.Integer
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import prolog.ast.terms.Variable
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class UnificationTest {
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/**
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* ?- X == a.
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* false.
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*/
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@Test
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fun equivalent_variable_and_atom() {
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val variable = Variable("X")
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val atom = Atom("a")
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val result = Equivalent(variable, atom).satisfy(emptyMap())
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assertFalse(result.any(), "Variable and atom should not be equivalent")
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}
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/**
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* ?- a == a.
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* true.
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*/
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@Test
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fun equivalent_atom_and_atom() {
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val atom1 = Atom("a")
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val atom2 = Atom("a")
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val result = Equivalent(atom1, atom2).satisfy(emptyMap())
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assertTrue(result.any(), "Identical atoms should be equivalent")
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assertTrue(result.first().isSuccess, "Result should be successful")
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assertEquals(0, result.first().getOrNull()!!.size, "No substitutions should be made")
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}
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/**
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* ?- 1 + 2 == 3.
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* false.
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*/
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@Test
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fun simple_addition_equivalence() {
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val addition = Add(Integer(1), Integer(2))
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val solution = Integer(3)
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val result = Equivalent(addition, solution).satisfy(emptyMap())
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assertFalse(result.any(), "Addition should be equivalent")
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}
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}
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