feat: navigate individual sections

internal/note/sections_test.go

@@ -0,0 +1,69 @@
+package note
+
+import "testing"
+
+func TestSlugifyHeading(t *testing.T) {
+	cases := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{name: "simple", input: "Glossary", want: "glossary"},
+		{name: "date and title", input: "2026-01-01 - First", want: "2026-01-01-first"},
+		{name: "punctuation", input: "Hello, World!", want: "hello-world"},
+		{name: "trim", input: "  spaced   out  ", want: "spaced-out"},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := slugifyHeading(tc.input); got != tc.want {
+				t.Fatalf("expected %q, got %q", tc.want, got)
+			}
+		})
+	}
+}
+
+func TestParseSections(t *testing.T) {
+	content := "# Title\nIntro\n## Alpha\nA1\nA2\n## Beta\nB1\n"
+
+	sections := ParseSections(content)
+	if len(sections) != 2 {
+		t.Fatalf("expected 2 sections, got %d", len(sections))
+	}
+
+	if sections[0].Heading != "Alpha" {
+		t.Fatalf("expected first heading Alpha, got %q", sections[0].Heading)
+	}
+	if sections[0].ID != "alpha" {
+		t.Fatalf("expected first id alpha, got %q", sections[0].ID)
+	}
+	if want := "## Alpha\nA1\nA2\n"; sections[0].Content != want {
+		t.Fatalf("expected first content %q, got %q", want, sections[0].Content)
+	}
+
+	if sections[1].Heading != "Beta" {
+		t.Fatalf("expected second heading Beta, got %q", sections[1].Heading)
+	}
+	if sections[1].ID != "beta" {
+		t.Fatalf("expected second id beta, got %q", sections[1].ID)
+	}
+	if want := "## Beta\nB1\n"; sections[1].Content != want {
+		t.Fatalf("expected second content %q, got %q", want, sections[1].Content)
+	}
+}
+
+func TestParseSections_DuplicateHeadings(t *testing.T) {
+	content := "## Glossary\nTerm A\n## Glossary\nTerm B\n"
+
+	sections := ParseSections(content)
+	if len(sections) != 2 {
+		t.Fatalf("expected 2 sections, got %d", len(sections))
+	}
+
+	if sections[0].ID != "glossary" {
+		t.Fatalf("expected first id glossary, got %q", sections[0].ID)
+	}
+	if sections[1].ID != "glossary-2" {
+		t.Fatalf("expected second id glossary-2, got %q", sections[1].ID)
+	}
+}