ForAll

tests/prolog/logic/TermAnalysisConstructionTest.kt

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+package prolog.logic
+
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import prolog.ast.terms.Atom
+import prolog.ast.terms.Structure
+
+/**
+ * Based on [Predicates for analyzing/constructing terms](https://github.com/dtonhofer/prolog_notes/blob/master/swipl_notes/about_term_analysis_and_construction/term_analysis_construction.png)
+ *
+ * Notes by [David Tonhofer](https://github.com/dtonhofer)
+ */
+class TermAnalysisConstructionTest {
+    @Test
+    fun atomic_term_properties() {
+        val atom = Atom("foo")
+
+        assertTrue(atomic(atom))
+        assertFalse(compound(atom))
+
+        assertTrue(functor(atom, Atom("foo"), 0))
+    }
+
+    @Test
+    fun compound_arity_0_properties() {
+        val structure = Structure(Atom("foo"), emptyList())
+
+        assertFalse(atomic(structure))
+        assertTrue(compound(structure))
+    }
+
+    @Test
+    fun compound_arity_1_properties() {
+        val structure = Structure(Atom("foo"), listOf(Atom("bar")))
+
+        assertFalse(atomic(structure))
+        assertTrue(compound(structure))
+
+        assertTrue(functor(structure, Atom("foo"), 1))
+    }
+}