1 files changed, 100 insertions, 0 deletions
diff --git a/Tests/NorgEditorTests/NorgEditorTests.swift b/Tests/NorgEditorTests/NorgEditorTests.swift
new file mode 100644
index 0000000..6a6caf7
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+++ b/Tests/NorgEditorTests/NorgEditorTests.swift
@@ -0,0 +1,100 @@
+import Foundation
+import NorgKit
+import Testing
+
+@testable import NorgEditor
+
+@Test func plainTextYieldsNoHighlights() {
+  #expect(NorgHighlighter.highlights(in: "just some prose").isEmpty)
+  #expect(NorgHighlighter.highlights(in: "").isEmpty)
+}
+
+@Test func headingMarkerIsHighlighted() {
+  let highlights = NorgHighlighter.highlights(in: "** Title")
+  let heading = highlights.first
+  #expect(heading?.kind == .heading(level: 2))
+  // The marker run `**` spans the first two UTF-16 units; the title is plain.
+  #expect(heading?.range == NSRange(location: 0, length: 2))
+}
+
+@Test func taskStatusIsHighlightedWithMarkerAndStatus() {
+  let highlights = NorgHighlighter.highlights(in: "- (x) buy milk")
+  #expect(highlights.contains { $0.kind == .unorderedList(level: 1) })
+
+  let status = highlights.first { highlight in
+    if case .taskStatus = highlight.kind { return true }
+    return false
+  }
+  #expect(status?.kind == .taskStatus(.done))
+  // `(x)` — open paren, status char, close paren.
+  #expect(status?.range == NSRange(location: 2, length: 3))
+}
+
+@Test func inlineVerbatimReportsDelimitersAndStyledText() {
+  let highlights = NorgHighlighter.highlights(in: "a `code` b")
+  let styled = highlights.first { highlight in
+    if case .styledText(let style) = highlight.kind { return style.contains(.verbatim) }
+    return false
+  }
+  #expect(styled?.range == NSRange(location: 3, length: 4))  // "code"
+  #expect(highlights.contains { $0.kind == .modifierDelimiter(.verbatim) })
+}
+
+@Test func rangesAreValidForMultibyteSource() {
+  // An emoji is two UTF-16 units; the bold run must land on the right span.
+  let source = "🌟 *bold*"
+  let highlights = NorgHighlighter.highlights(in: source)
+  let nsSource = source as NSString
+  let styled = highlights.first { highlight in
+    if case .styledText(let style) = highlight.kind { return style.contains(.bold) }
+    return false
+  }
+  let range = styled?.range
+  #expect(range.map { nsSource.substring(with: $0) } == "bold")
+}
+
+@Test func linkTargetIsHighlighted() {
+  let highlights = NorgHighlighter.highlights(in: "see {https://example.com}")
+  #expect(highlights.contains { $0.kind == .linkTarget })
+  #expect(highlights.contains { $0.kind == .linkDelimiter })
+}
+
+// MARK: - Auto-indentation (Return key)
+
+/// Indentation at the end of `source` (where Return would land).
+private func indent(after source: String) -> String {
+  NorgAutoIndent.indentation(for: source, newlineAt: (source as NSString).length)
+}
+
+@Test func indentsUnderTheOpenHeading() {
+  // `*** ` is three markers plus a space, so the text starts at column 4.
+  #expect(indent(after: "*** Headline") == "    ")
+  #expect(indent(after: "* Top") == "  ")
+}
+
+@Test func plainTextWithoutAHeadingHasNoIndent() {
+  #expect(indent(after: "just a paragraph") == "")
+  #expect(indent(after: "") == "")
+}
+
+@Test func indentPersistsAcrossContentLines() {
+  // A paragraph under the heading keeps the heading's indent on the next line.
+  #expect(indent(after: "* A\nsome prose") == "  ")
+}
+
+@Test func indentFollowsTheDeepestOpenHeading() {
+  #expect(indent(after: "* A\n** B\n*** C") == "    ")
+}
+
+@Test func strongDelimiterClosesAllHeadings() {
+  #expect(indent(after: "* A\n** B\n===\nmore") == "")
+}
+
+@Test func weakDelimiterReturnsToTheParentHeading() {
+  // `---` closes `** B`, leaving `* A` open → align under its text (column 2).
+  #expect(indent(after: "* A\n** B\n---\nmore") == "  ")
+}
+
+@Test func horizontalRuleLeavesHeadingScopeIntact() {
+  #expect(indent(after: "* A\n___\nmore") == "  ")
+}