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+#!/usr/bin/env bats
+# tests/unit/template_vars.bats
+# Unit tests for template variable substitution patterns.
+#
+# These tests replicate the escape_sed_pattern_literal logic from trbldoc.sh
+# and verify that:
+#   - the canonical {{ var }} format (two brackets, one space each side) is matched
+#   - the old {{varname}} format (two brackets, no spaces) is NOT matched
+#   - the layout-specific patterns ({{ title }}, {{ nav }}, {{ yield }},
+#     {{ breadcrumb }}) work correctly in sed address and substitution position
+
+load "../helpers/common.bash"
+
+setup() {
+  setup_workspace
+}
+
+teardown() {
+  teardown_workspace
+}
+
+# Replicate escape_sed_pattern_literal from trbldoc.sh.
+escape_pat() {
+  printf '%s' "$1" | sed -e 's/[][\\.^$*+?(){}|]/\\&/g'
+}
+
+# ── chunk template variables ──────────────────────────────────────────────────
+
+@test "template vars: {{ src_repo }} is matched and substituted" {
+  local pat result
+  pat=$(escape_pat '{{ src_repo }}')
+  result=$(printf '%s' 'Link: {{ src_repo }}/file.c' | sed -E "s|$pat|https://example.com|g")
+  assert_equal "$result" 'Link: https://example.com/file.c'
+}
+
+@test "template vars: {{src_repo}} without spaces is NOT matched" {
+  local pat result
+  pat=$(escape_pat '{{ src_repo }}')
+  result=$(printf '%s' 'Old: {{src_repo}}' | sed -E "s|$pat|https://example.com|g")
+  assert_equal "$result" 'Old: {{src_repo}}'
+}
+
+@test "template vars: {{ toc }} is matched and substituted" {
+  local pat result
+  pat=$(escape_pat '{{ toc }}')
+  result=$(printf '%s' 'Nav: {{ toc }}' | sed -E "s|$pat|<ul><li>nav</li></ul>|g")
+  assert_equal "$result" 'Nav: <ul><li>nav</li></ul>'
+}
+
+@test "template vars: {{toc}} without spaces is NOT matched" {
+  local pat result
+  pat=$(escape_pat '{{ toc }}')
+  result=$(printf '%s' 'Old: {{toc}}' | sed -E "s|$pat|<ul><li>nav</li></ul>|g")
+  assert_equal "$result" 'Old: {{toc}}'
+}
+
+@test "template vars: {{ ref_string }} is matched and substituted" {
+  local pat result
+  pat=$(escape_pat '{{ ref_string }}')
+  result=$(printf '%s' "See: {{ ref_string }}." | sed -E "s|$pat|<a href='/x'>x</a>|g")
+  assert_equal "$result" "See: <a href='/x'>x</a>."
+}
+
+@test "template vars: {{ref_string}} without spaces is NOT matched" {
+  local pat result
+  pat=$(escape_pat '{{ ref_string }}')
+  result=$(printf '%s' 'Old: {{ref_string}}' | sed -E "s|$pat|<a href='/x'>x</a>|g")
+  assert_equal "$result" 'Old: {{ref_string}}'
+}
+
+@test "template vars: multiple {{ src_repo }} occurrences are all substituted" {
+  local pat result
+  pat=$(escape_pat '{{ src_repo }}')
+  result=$(printf '%s' '{{ src_repo }}/a and {{ src_repo }}/b' | sed -E "s|$pat|https://r|g")
+  assert_equal "$result" 'https://r/a and https://r/b'
+}
+
+# ── layout template variables ─────────────────────────────────────────────────
+
+@test "template vars: layout {{ title }} is matched and substituted" {
+  local result
+  result=$(printf '%s' '<title>{{ title }}</title>' \
+    | sed -E "s|\\{\\{ title \\}\\}|My Page|g")
+  assert_equal "$result" '<title>My Page</title>'
+}
+
+@test "template vars: layout {{title}} without spaces is NOT matched" {
+  local result
+  result=$(printf '%s' '<title>{{title}}</title>' \
+    | sed -E "s|\\{\\{ title \\}\\}|My Page|g")
+  assert_equal "$result" '<title>{{title}}</title>'
+}
+
+@test "template vars: layout {{ breadcrumb }} is matched and substituted" {
+  local result
+  result=$(printf '%s' '<h1>{{ breadcrumb }}</h1>' \
+    | sed -E "s|\\{\\{ breadcrumb \\}\\}|Section|g")
+  assert_equal "$result" '<h1>Section</h1>'
+}
+
+@test "template vars: layout {{breadcrumb}} without spaces is NOT matched" {
+  local result
+  result=$(printf '%s' '{{breadcrumb}}' \
+    | sed -E "s|\\{\\{ breadcrumb \\}\\}|Section|g")
+  assert_equal "$result" '{{breadcrumb}}'
+}
+
+@test "template vars: layout {{ nav }} is matched and substituted" {
+  local result
+  result=$(printf '%s' '<ul>{{ nav }}</ul>' \
+    | sed -E "s|\\{\\{ nav \\}\\}|<li>item</li>|g")
+  assert_equal "$result" '<ul><li>item</li></ul>'
+}
+
+@test "template vars: layout old {{> nav}} partial syntax is NOT matched by {{ nav }} pattern" {
+  local result
+  result=$(printf '%s' '<ul>{{> nav}}</ul>' \
+    | sed -E "s|\\{\\{ nav \\}\\}|<li>item</li>|g")
+  assert_equal "$result" '<ul>{{> nav}}</ul>'
+}
+
+@test "template vars: layout {{ yield }} works as sed address to include a file" {
+  local tmpbody tmplayout output
+  tmpbody=$(mktemp)
+  tmplayout=$(mktemp)
+  printf '<p>body content</p>\n' > "$tmpbody"
+  printf '{{ yield }}\n' > "$tmplayout"
+  output=$(sed -E \
+    -e "/\\{\\{ yield \\}\\}/r $tmpbody" \
+    -e "/\\{\\{ yield \\}\\}/d" \
+    "$tmplayout")
+  rm -f "$tmpbody" "$tmplayout"
+  assert_equal "$output" '<p>body content</p>'
+}
+
+@test "template vars: layout old {{{yield}}} triple-brace is NOT matched by {{ yield }} pattern" {
+  local tmpbody tmplayout output
+  tmpbody=$(mktemp)
+  tmplayout=$(mktemp)
+  printf '<p>body content</p>\n' > "$tmpbody"
+  printf '{{{yield}}}\n' > "$tmplayout"
+  output=$(sed -E \
+    -e "/\\{\\{ yield \\}\\}/r $tmpbody" \
+    -e "/\\{\\{ yield \\}\\}/d" \
+    "$tmplayout")
+  rm -f "$tmpbody" "$tmplayout"
+  # {{{yield}}} should remain unchanged — the new pattern only matches {{ yield }}
+  assert_equal "$output" '{{{yield}}}'
+}
+
+@test "template vars: substitution value containing special sed chars is safe" {
+  # Verify that replacement values with & and \ don't corrupt the output
+  # (this exercises the escape_sed_replacement_literal path)
+  local pat esc_repl result
+  pat=$(escape_pat '{{ src_repo }}')
+  # Simulate escape_sed_replacement_literal for a URL containing &
+  esc_repl=$(printf '%s' 'https://example.com/a&b' | sed -e 's/[\\&|]/\\&/g')
+  result=$(printf '%s' '{{ src_repo }}/path' | sed -E "s|$pat|$esc_repl|g")
+  assert_equal "$result" 'https://example.com/a&b/path'
+}