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108 lines
3.4 KiB
Swift
108 lines
3.4 KiB
Swift
final class LocationTests: XCTestCase {
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func testExplorationOfATermBeginsAtTheExploredTerm() {
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assert(term.explore().it, ==, term)
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}
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func testCannotMoveUpwardsAtTheStartOfAnExploration() {
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assert(term.explore().outOf?.it, ==, nil)
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}
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func testCannotMoveSidewaysAtTheStartOfAnExploration() {
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assert(term.explore().left?.it, ==, nil)
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assert(term.explore().right?.it, ==, nil)
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}
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func testCannotMoveDownwardsFromLeaves() {
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assert(leafA.explore().into?.it, ==, nil)
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}
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func testCanMoveDownwardsIntoBranches() {
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assert(term.explore().into?.it, ==, leafA)
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}
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func testCanMoveBackUpwards() {
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assert(term.explore().into?.outOf?.it, ==, term)
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}
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func testCannotMoveLeftwardsFromFirstChildOfBranch() {
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assert(term.explore().into?.left?.it, ==, nil)
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}
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func testCanMoveRightwardsFromLeftmostChildOfLongBranch() {
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assert(term.explore().into?.right?.it, ==, leafB)
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}
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func testCanExploreBranchesDeeply() {
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assert(term.explore().into?.right?.right?.into?.it, ==, innerLeafB)
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}
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func testCanMoveBackUpwardsFromDeepExplorations() {
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assert(term.explore().into?.right?.right?.into?.right?.outOf?.outOf?.it, ==, term)
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}
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func testCanReturnToStartOfExplorationFromArbitrarilyDeepNodes() {
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assert(term.explore().into?.right?.right?.into?.right?.root.it, ==, term)
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}
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func testSequenceIsPreOrderDepthFirstTraversal() {
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assert(term.explore().map { $0.it.extract }, ==, [ 0, 1, 2, 3, 5, 4 ])
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}
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func testModifyReplacesSubtrees() {
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assert(term.explore().into?.modify(const(leafB)).right?.outOf?.it, ==, Cofree(0, .Indexed([ leafB, leafB, keyed ])))
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}
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func testMultipleModificationsReplaceMultipleSubtrees() {
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assert(term.explore().into?.modify(const(leafB)).right?.modify(const(leafA)).outOf?.it, ==, Cofree(0, .Indexed([ leafB, leafA, keyed ])))
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}
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func testModificationsPreserveKeys() {
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assert(keyed.explore().into?.modify(const(leafA)).root.it, ==, Cofree(3, .Keyed([ "a": innerLeafA, "b": leafA ])))
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}
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func testDeepModificationsReplaceDeepSubtrees() {
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assert(term.explore().into?.modify(const(leafB)).right?.modify(const(leafA)).right?.into?.modify(const(innerLeafA)).right?.modify(const(innerLeafB)).root.it, ==, Cofree(0, .Indexed([ leafB, leafA, Cofree(3, .Keyed([ "a": innerLeafB, "b": innerLeafA ])) ])))
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}
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func testModificationsCanRefineDiffs() {
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assert(diff.explore().into?.right?.modify(const(refined)).root.it, ==, Free.Roll(0, .Indexed([ Free.Roll(1, .Leaf("a string")), refined ])))
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}
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}
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private let leafA = Cofree(1, .Leaf("a string"))
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private let leafB = Cofree(2, .Leaf("b string"))
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private let innerLeafA = Cofree(4, .Leaf("a nested string"))
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private let innerLeafB = Cofree(5, .Leaf("b nested string"))
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private let keyed = Cofree(3, .Keyed([
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"a": innerLeafA,
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"b": innerLeafB,
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]))
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private let term: Cofree<String, Int> = Cofree(0, .Indexed([
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leafA,
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leafB,
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keyed,
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]))
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private let diff: Free<String, Int, Patch<Cofree<String, Int>>> = Free.Roll(0, .Indexed([
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Free.Roll(1, .Leaf("a string")),
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Free.Pure(Patch.Replace(leafA, leafB)), // coarse-grained diff of two leaf nodes
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]))
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// fine-grained diff of same
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private let refined = Free.Roll(2, .Indexed([
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Free.Pure(Patch.Replace(Cofree(1, .Leaf("a")), Cofree(2, .Leaf("b")))),
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Free.Roll(4, .Leaf(" ")),
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Free.Roll(5, .Leaf("s")),
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Free.Roll(6, .Leaf("t")),
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Free.Roll(7, .Leaf("r")),
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Free.Roll(8, .Leaf("i")),
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Free.Roll(9, .Leaf("n")),
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Free.Roll(10, .Leaf("g")),
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]))
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import Assertions
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@testable import Doubt
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import Prelude
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import XCTest
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