73 lines
1.9 KiB
Kotlin
73 lines
1.9 KiB
Kotlin
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package net.shadowfacts.cacao.util
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import org.junit.jupiter.api.Assertions.assertEquals
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import org.junit.jupiter.api.Assertions.assertNull
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import org.junit.jupiter.api.Test
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/**
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* @author shadowfacts
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*/
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class LCATest {
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class Node(val name: String, val parent: Node?)
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@Test
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fun testDirectParent() {
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val parent = Node("parent", null)
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val child = Node("child", parent)
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assertEquals(parent, LowestCommonAncestor.find(parent, child, Node::parent))
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assertEquals(parent, LowestCommonAncestor.find(child, parent, Node::parent))
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}
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@Test
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fun testSiblings() {
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val root = Node("root", null)
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val a = Node("a", root)
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val b = Node("b", root)
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assertEquals(root, LowestCommonAncestor.find(a, b, Node::parent))
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}
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@Test
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fun testBetweenSubtrees() {
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// ┌────┐
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// │root│
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// └────┘
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// ╱ ╲
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// ╱ ╲
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// ┌─┐ ┌─┐
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// │A│ │B│
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// └─┘ └─┘
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// ╱ ╲ ╱ ╲
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// ╱ ╲ ╱ ╲
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// ┌─┐ ┌─┐┌─┐ ┌─┐
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// │C│ │D││E│ │F│
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// └─┘ └─┘└─┘ └─┘
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val root = Node("root", null)
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val a = Node("a", root)
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val c = Node("c", a)
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val d = Node("d", a)
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val b = Node("b", root)
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val e = Node("e", b)
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val f = Node("f", b)
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assertEquals(a, LowestCommonAncestor.find(c, d, Node::parent))
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assertEquals(root, LowestCommonAncestor.find(c, b, Node::parent))
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assertEquals(root, LowestCommonAncestor.find(d, e, Node::parent))
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assertEquals(root, LowestCommonAncestor.find(c, root, Node::parent))
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}
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@Test
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fun testBetweenDisjointTrees() {
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val a = Node("a", null)
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val b = Node("b", a)
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val c = Node("c", null)
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val d = Node("d", c)
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assertNull(LowestCommonAncestor.find(a, d, Node::parent))
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assertNull(LowestCommonAncestor.find(b, c, Node::parent))
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}
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}
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