9 files changed, 440 insertions, 0 deletions
diff --git a/Tests/NorgKitTests/Models/DetachedModifierTests.swift b/Tests/NorgKitTests/Models/DetachedModifierTests.swift
new file mode 100644
index 0000000..7ef1479
--- /dev/null
+++ b/Tests/NorgKitTests/Models/DetachedModifierTests.swift
@@ -0,0 +1,61 @@
+import Testing
+
+@testable import NorgKit
+
+struct DetachedModifierTests {
+
+  private let markers = ASCIIByteSet("*-~>$^:")
+
+  @Test func parsesMarkerLevelAndContent() {
+    let m = DetachedModifier.parse("** heading"[...], accepting: markers)
+    #expect(m?.marker == "*")
+    #expect(m?.level == 2)
+    #expect(m?.content == "heading")
+    #expect(m?.status == nil)
+  }
+
+  @Test func skipsLeadingWhitespace() {
+    let m = DetachedModifier.parse("   - item"[...], accepting: markers)
+    #expect(m?.marker == "-")
+    #expect(m?.level == 1)
+    #expect(m?.content == "item")
+  }
+
+  @Test func parsesStatusAndStatusIndex() {
+    let line = "- (x) done"
+    let m = DetachedModifier.parse(line[...], accepting: markers)
+    #expect(m?.status == .done)
+    #expect(m?.content == "done")
+
+    if let index = m?.statusIndex {
+      #expect(line[index] == "x")
+    } else {
+      Issue.record("Expected a status index")
+    }
+  }
+
+  @Test func returnsNilForUnacceptedMarker() {
+    #expect(DetachedModifier.parse("+ item"[...], accepting: markers) == nil)
+  }
+
+  @Test func returnsNilWithoutWhitespaceAfterMarker() {
+    #expect(DetachedModifier.parse("*bold*"[...], accepting: markers) == nil)
+  }
+
+  @Test func returnsNilForEmptyAndBlankLines() {
+    #expect(DetachedModifier.parse(""[...], accepting: markers) == nil)
+    #expect(DetachedModifier.parse("    "[...], accepting: markers) == nil)
+  }
+
+  @Test func unterminatedStatusParenIsTreatedAsContent() {
+    let m = DetachedModifier.parse("- (x oops"[...], accepting: markers)
+    #expect(m?.status == nil)
+    #expect(m?.content == "(x oops")
+  }
+
+  @Test func unknownStatusCharInParensIsContent() {
+    let m = DetachedModifier.parse("- (z) text"[...], accepting: markers)
+    #expect(m?.status == nil)
+    #expect(m?.content == "(z) text")
+  }
+}
diff --git a/Tests/NorgKitTests/Models/InlineLinkTests.swift b/Tests/NorgKitTests/Models/InlineLinkTests.swift
new file mode 100644
index 0000000..9cf2cce
--- /dev/null
+++ b/Tests/NorgKitTests/Models/InlineLinkTests.swift
@@ -0,0 +1,32 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct InlineLinkTests {
+
+  @Test func storesKindAndTarget() {
+    let link = InlineLink(kind: .link, target: "https://example.com")
+    #expect(link.kind == .link)
+    #expect(link.target == "https://example.com")
+  }
+
+  @Test func anchorMayHaveNoTarget() {
+    let anchor = InlineLink(kind: .anchor, target: nil)
+    #expect(anchor.kind == .anchor)
+    #expect(anchor.target == nil)
+  }
+
+  @Test func equatableDistinguishesKindAndTarget() {
+    #expect(InlineLink(kind: .link, target: "a") == InlineLink(kind: .link, target: "a"))
+    #expect(InlineLink(kind: .link, target: "a") != InlineLink(kind: .anchor, target: "a"))
+    #expect(InlineLink(kind: .link, target: "a") != InlineLink(kind: .link, target: "b"))
+  }
+
+  @Test func roundTripsThroughJSON() throws {
+    for link in [InlineLink(kind: .link, target: "x"), InlineLink(kind: .anchor, target: nil)] {
+      let data = try JSONEncoder().encode(link)
+      #expect(try JSONDecoder().decode(InlineLink.self, from: data) == link)
+    }
+  }
+}
diff --git a/Tests/NorgKitTests/Models/InlineSpanTests.swift b/Tests/NorgKitTests/Models/InlineSpanTests.swift
new file mode 100644
index 0000000..24531e4
--- /dev/null
+++ b/Tests/NorgKitTests/Models/InlineSpanTests.swift
@@ -0,0 +1,35 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct InlineSpanTests {
+
+  @Test func defaultsToNoStyleAndNoLink() {
+    let span = InlineSpan(text: "hi")
+    #expect(span.styles.isEmpty)
+    #expect(span.link == nil)
+  }
+
+  @Test func storesStyleAndLink() {
+    let link = InlineLink(kind: .link, target: "https://example.com")
+    let span = InlineSpan(text: "hi", styles: .bold, link: link)
+    #expect(span.styles.contains(.bold))
+    #expect(span.link == link)
+  }
+
+  @Test func equatableDistinguishesFields() {
+    #expect(InlineSpan(text: "a") == InlineSpan(text: "a"))
+    #expect(InlineSpan(text: "a") != InlineSpan(text: "b"))
+    #expect(InlineSpan(text: "a", styles: .bold) != InlineSpan(text: "a"))
+  }
+
+  @Test func roundTripsThroughJSON() throws {
+    let span = InlineSpan(
+      text: "hi", styles: [.bold, .italic],
+      link: InlineLink(kind: .anchor, target: nil)
+    )
+    let data = try JSONEncoder().encode(span)
+    #expect(try JSONDecoder().decode(InlineSpan.self, from: data) == span)
+  }
+}
diff --git a/Tests/NorgKitTests/Models/InlineStyleTests.swift b/Tests/NorgKitTests/Models/InlineStyleTests.swift
new file mode 100644
index 0000000..4eafc12
--- /dev/null
+++ b/Tests/NorgKitTests/Models/InlineStyleTests.swift
@@ -0,0 +1,35 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct InlineStyleTests {
+
+  @Test func combinesAndContains() {
+    let style: InlineStyle = [.bold, .italic]
+    #expect(style.contains(.bold))
+    #expect(style.contains(.italic))
+    #expect(!style.contains(.underline))
+  }
+
+  @Test func distinctRawValues() {
+    let all: [InlineStyle] = [
+      .bold, .italic, .underline, .strikethrough,
+      .verbatim, .superscript, .subscript, .spoiler, .math,
+    ]
+    #expect(Set(all.map(\.rawValue)).count == all.count)
+  }
+
+  @Test func encodesAsSingleInteger() throws {
+    let style: InlineStyle = [.bold, .verbatim]
+    let data = try JSONEncoder().encode(style)
+    #expect(String(data: data, encoding: .utf8) == "\(style.rawValue)")
+  }
+
+  @Test func roundTripsThroughJSON() throws {
+    let style: InlineStyle = [.italic, .math, .spoiler]
+    let data = try JSONEncoder().encode(style)
+    let decoded = try JSONDecoder().decode(InlineStyle.self, from: data)
+    #expect(decoded == style)
+  }
+}
diff --git a/Tests/NorgKitTests/Models/NorgBlockTests.swift b/Tests/NorgKitTests/Models/NorgBlockTests.swift
new file mode 100644
index 0000000..d9d18c2
--- /dev/null
+++ b/Tests/NorgKitTests/Models/NorgBlockTests.swift
@@ -0,0 +1,127 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct NorgBlockTests {
+
+  private let span = [InlineSpan(text: "x")]
+  private let title = [InlineSpan(text: "t")]
+  private let body: [NorgBlock] = [.paragraph(content: [InlineSpan(text: "b")], line: 1)]
+
+  private var allBlocks: [NorgBlock] {
+    [
+      .heading(level: 1, status: .done, content: span, line: 0),
+      .paragraph(content: span, line: 1),
+      .unorderedListItem(level: 1, status: .undone, content: span, line: 2),
+      .orderedListItem(level: 1, status: .pending, content: span, line: 3),
+      .quote(level: 1, status: .urgent, content: span, line: 4),
+      .codeBlock(language: "swift", code: "c", line: 5),
+      .definition(title: title, status: .needsInput, body: body, line: 6),
+      .footnote(title: title, status: .onHold, body: body, line: 7),
+      .tableCell(title: title, status: .recurring, body: body, line: 8),
+      .rangedTag(name: ["img"], parameters: ["a"], content: "c", line: 9),
+      .horizontalRule(line: 10),
+      .weakDelimiter(line: 11),
+      .strongDelimiter(line: 12),
+    ]
+  }
+
+  @Test func lineReportsSourceLineForEveryCase() {
+    for (expected, block) in allBlocks.enumerated() {
+      #expect(block.line == expected)
+    }
+  }
+
+  @Test func statusReturnsValueForStatusBearingBlocks() {
+    #expect(NorgBlock.heading(level: 1, status: .done, content: span, line: 0).status == .done)
+    #expect(
+      NorgBlock.unorderedListItem(level: 1, status: .undone, content: span, line: 0).status
+        == .undone)
+    #expect(
+      NorgBlock.orderedListItem(level: 1, status: .pending, content: span, line: 0).status
+        == .pending)
+    #expect(NorgBlock.quote(level: 1, status: .urgent, content: span, line: 0).status == .urgent)
+    #expect(
+      NorgBlock.definition(title: title, status: .needsInput, body: body, line: 0).status
+        == .needsInput)
+    #expect(
+      NorgBlock.footnote(title: title, status: .onHold, body: body, line: 0).status == .onHold)
+    #expect(
+      NorgBlock.tableCell(title: title, status: .recurring, body: body, line: 0).status
+        == .recurring)
+  }
+
+  @Test func statusIsNilForBlocksThatCannotCarryOne() {
+    #expect(NorgBlock.paragraph(content: span, line: 0).status == nil)
+    #expect(NorgBlock.codeBlock(language: nil, code: "c", line: 0).status == nil)
+    #expect(NorgBlock.rangedTag(name: ["x"], parameters: [], content: "c", line: 0).status == nil)
+    #expect(NorgBlock.horizontalRule(line: 0).status == nil)
+    #expect(NorgBlock.weakDelimiter(line: 0).status == nil)
+    #expect(NorgBlock.strongDelimiter(line: 0).status == nil)
+  }
+
+  @Test func contentReturnsInlineSpansOrTitle() {
+    #expect(NorgBlock.heading(level: 1, status: nil, content: span, line: 0).content == span)
+    #expect(NorgBlock.paragraph(content: span, line: 0).content == span)
+    #expect(
+      NorgBlock.unorderedListItem(level: 1, status: nil, content: span, line: 0).content == span)
+    #expect(
+      NorgBlock.orderedListItem(level: 1, status: nil, content: span, line: 0).content == span)
+    #expect(NorgBlock.quote(level: 1, status: nil, content: span, line: 0).content == span)
+    #expect(NorgBlock.definition(title: title, status: nil, body: body, line: 0).content == title)
+    #expect(NorgBlock.footnote(title: title, status: nil, body: body, line: 0).content == title)
+    #expect(NorgBlock.tableCell(title: title, status: nil, body: body, line: 0).content == title)
+  }
+
+  @Test func contentIsNilForContentlessBlocks() {
+    #expect(NorgBlock.codeBlock(language: nil, code: "c", line: 0).content == nil)
+    #expect(NorgBlock.rangedTag(name: ["x"], parameters: [], content: "c", line: 0).content == nil)
+    #expect(NorgBlock.horizontalRule(line: 0).content == nil)
+    #expect(NorgBlock.weakDelimiter(line: 0).content == nil)
+    #expect(NorgBlock.strongDelimiter(line: 0).content == nil)
+  }
+
+  @Test func bodyReturnsNestedBlocksForRangeableBlocks() {
+    #expect(NorgBlock.definition(title: title, status: nil, body: body, line: 0).body == body)
+    #expect(NorgBlock.footnote(title: title, status: nil, body: body, line: 0).body == body)
+    #expect(NorgBlock.tableCell(title: title, status: nil, body: body, line: 0).body == body)
+  }
+
+  @Test func bodyIsNilForNonRangeableBlocks() {
+    #expect(NorgBlock.heading(level: 1, status: nil, content: span, line: 0).body == nil)
+    #expect(NorgBlock.paragraph(content: span, line: 0).body == nil)
+    #expect(NorgBlock.codeBlock(language: nil, code: "c", line: 0).body == nil)
+    #expect(NorgBlock.horizontalRule(line: 0).body == nil)
+  }
+
+  @Test func settingStatusReplacesStatusOnSupportingBlocks() {
+    let cases: [NorgBlock] = [
+      .heading(level: 2, status: nil, content: span, line: 0),
+      .unorderedListItem(level: 1, status: nil, content: span, line: 0),
+      .orderedListItem(level: 1, status: nil, content: span, line: 0),
+      .quote(level: 1, status: nil, content: span, line: 0),
+      .definition(title: title, status: nil, body: body, line: 0),
+      .footnote(title: title, status: nil, body: body, line: 0),
+      .tableCell(title: title, status: nil, body: body, line: 0),
+    ]
+    for block in cases {
+      #expect(block.status == nil)
+      let set = block.settingStatus(.done)
+      #expect(set.status == .done)
+      #expect(set.line == block.line)
+      #expect(set.content == block.content)
+      #expect(set.body == block.body)
+      #expect(set.settingStatus(nil).status == nil)
+    }
+  }
+
+  @Test func settingStatusLeavesUnsupportedBlocksUnchanged() {
+    let paragraph = NorgBlock.paragraph(content: span, line: 0)
+    #expect(paragraph.settingStatus(.done) == paragraph)
+    let rule = NorgBlock.horizontalRule(line: 0)
+    #expect(rule.settingStatus(.done) == rule)
+    let code = NorgBlock.codeBlock(language: "swift", code: "c", line: 0)
+    #expect(code.settingStatus(.urgent) == code)
+  }
+}
diff --git a/Tests/NorgKitTests/Models/NorgDocumentTests.swift b/Tests/NorgKitTests/Models/NorgDocumentTests.swift
new file mode 100644
index 0000000..13bad67
--- /dev/null
+++ b/Tests/NorgKitTests/Models/NorgDocumentTests.swift
@@ -0,0 +1,32 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct NorgDocumentTests {
+
+  @Test func defaultsToEmptyBlocks() {
+    #expect(NorgDocument().blocks.isEmpty)
+  }
+
+  @Test func treeFoldsBlocksIntoNodes() {
+    let doc = NorgDocument(blocks: [
+      .heading(level: 1, status: nil, content: [InlineSpan(text: "H")], line: 0),
+      .paragraph(content: [InlineSpan(text: "body")], line: 1),
+    ])
+    let tree = doc.tree()
+    #expect(tree.count == 1)
+    #expect(tree.first?.children.count == 1)
+  }
+
+  @Test func treeMatchesTreeFolderOutput() {
+    let doc = NorgParser.parse("* H\n- a\n-- b")
+    #expect(doc.tree() == TreeFolder(doc.blocks).fold())
+  }
+
+  @Test func roundTripsThroughJSON() throws {
+    let doc = NorgParser.parse("* H\nbody\n- ( ) task")
+    let data = try JSONEncoder().encode(doc)
+    #expect(try JSONDecoder().decode(NorgDocument.self, from: data) == doc)
+  }
+}
diff --git a/Tests/NorgKitTests/Models/NorgNodeTests.swift b/Tests/NorgKitTests/Models/NorgNodeTests.swift
new file mode 100644
index 0000000..5e60014
--- /dev/null
+++ b/Tests/NorgKitTests/Models/NorgNodeTests.swift
@@ -0,0 +1,31 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct NorgNodeTests {
+
+  private let block = NorgBlock.paragraph(content: [InlineSpan(text: "x")], line: 0)
+
+  @Test func defaultsToNoChildren() {
+    #expect(NorgNode(block: block).children.isEmpty)
+  }
+
+  @Test func storesBlockAndChildren() {
+    let child = NorgNode(block: block)
+    let node = NorgNode(block: block, children: [child])
+    #expect(node.block == block)
+    #expect(node.children == [child])
+  }
+
+  @Test func equatableComparesBlockAndChildren() {
+    #expect(NorgNode(block: block) == NorgNode(block: block))
+    #expect(NorgNode(block: block, children: [NorgNode(block: block)]) != NorgNode(block: block))
+  }
+
+  @Test func roundTripsThroughJSON() throws {
+    let node = NorgNode(block: block, children: [NorgNode(block: block)])
+    let data = try JSONEncoder().encode(node)
+    #expect(try JSONDecoder().decode(NorgNode.self, from: data) == node)
+  }
+}
diff --git a/Tests/NorgKitTests/Models/NorgTaskTests.swift b/Tests/NorgKitTests/Models/NorgTaskTests.swift
new file mode 100644
index 0000000..e8707a1
--- /dev/null
+++ b/Tests/NorgKitTests/Models/NorgTaskTests.swift
@@ -0,0 +1,33 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct NorgTaskTests {
+
+  private let file = URL(filePath: "/tmp/notes.norg")
+
+  @Test func idCombinesFileURLAndLine() {
+    let task = NorgTask(fileURL: file, line: 7, status: .undone, text: "do it")
+    #expect(task.id == "\(file.absoluteString):7")
+  }
+
+  @Test func idIsStableForSameFileAndLine() {
+    let a = NorgTask(fileURL: file, line: 3, status: .done, text: "a")
+    let b = NorgTask(fileURL: file, line: 3, status: .urgent, text: "b")
+    #expect(a.id == b.id)
+  }
+
+  @Test func differentLinesProduceDifferentIDs() {
+    let a = NorgTask(fileURL: file, line: 1, status: .done, text: "a")
+    let b = NorgTask(fileURL: file, line: 2, status: .done, text: "a")
+    #expect(a.id != b.id)
+  }
+
+  @Test func roundTripsThroughJSON() throws {
+    let task = NorgTask(fileURL: file, line: 4, status: .pending, text: "keep")
+    let data = try JSONEncoder().encode(task)
+    let decoded = try JSONDecoder().decode(NorgTask.self, from: data)
+    #expect(decoded == task)
+  }
+}
diff --git a/Tests/NorgKitTests/Models/TaskStatusTests.swift b/Tests/NorgKitTests/Models/TaskStatusTests.swift
new file mode 100644
index 0000000..a00e50c
--- /dev/null
+++ b/Tests/NorgKitTests/Models/TaskStatusTests.swift
@@ -0,0 +1,54 @@
+import Foundation
+import Testing
+
+@testable import NorgKit
+
+struct TaskStatusTests {
+
+  @Test func parsesEveryMarker() {
+    #expect(TaskStatus(marker: " ") == .undone)
+    #expect(TaskStatus(marker: "x") == .done)
+    #expect(TaskStatus(marker: "?") == .needsInput)
+    #expect(TaskStatus(marker: "!") == .urgent)
+    #expect(TaskStatus(marker: "+") == .recurring)
+    #expect(TaskStatus(marker: "-") == .pending)
+    #expect(TaskStatus(marker: "=") == .onHold)
+    #expect(TaskStatus(marker: "_") == .cancelled)
+  }
+
+  @Test func rejectsUnknownMarker() {
+    #expect(TaskStatus(marker: "z") == nil)
+  }
+
+  @Test func parsesEveryMarkerByte() {
+    #expect(TaskStatus(markerByte: UInt8(ascii: " ")) == .undone)
+    #expect(TaskStatus(markerByte: UInt8(ascii: "x")) == .done)
+    #expect(TaskStatus(markerByte: UInt8(ascii: "?")) == .needsInput)
+    #expect(TaskStatus(markerByte: UInt8(ascii: "!")) == .urgent)
+    #expect(TaskStatus(markerByte: UInt8(ascii: "+")) == .recurring)
+    #expect(TaskStatus(markerByte: UInt8(ascii: "-")) == .pending)
+    #expect(TaskStatus(markerByte: UInt8(ascii: "=")) == .onHold)
+    #expect(TaskStatus(markerByte: UInt8(ascii: "_")) == .cancelled)
+  }
+
+  @Test func rejectsUnknownMarkerByte() {
+    #expect(TaskStatus(markerByte: UInt8(ascii: "z")) == nil)
+  }
+
+  @Test func idEqualsRawValue() {
+    for status in TaskStatus.allCases {
+      #expect(status.id == status.rawValue)
+    }
+  }
+
+  @Test func rawValuesMatchMarkers() {
+    #expect(TaskStatus.undone.rawValue == " ")
+    #expect(TaskStatus.done.rawValue == "x")
+    #expect(TaskStatus.allCases.count == 8)
+  }
+
+  @Test func roundTripsThroughJSON() throws {
+    let data = try JSONEncoder().encode(TaskStatus.urgent)
+    #expect(try JSONDecoder().decode(TaskStatus.self, from: data) == .urgent)
+  }
+}