Add test suite for template.lua variable expansion engine

Overview

The template.lua module (~120 lines) handles template variable expansion, a core feature. It has no test coverage.

Functions Needing Tests

Public API

• build_context(notebook_path) - Build template context

  • Test: includes date variables (date, time, datetime, iso_datetime)
  • Test: includes file variables (file, filename, basename, ext, dir, relpath)
  • Test: includes cursor variables (cursor_line, cursor_col)
  • Test: includes clipboard content
  • Test: handles custom variables from vim.g.zk_template_vars
  • Test: handles custom variables from function
  • Test: handles missing notebook_path
  • Test: computes relative path correctly

• expand_template(text, context) - Expand template variables

  • Test: expands {{date}} to current date
  • Test: expands {{time}} to current time
  • Test: expands {{datetime}} correctly
  • Test: expands {{iso_datetime}} with timezone
  • Test: expands {{file}}, {{filename}}, {{basename}}, {{ext}}
  • Test: expands {{dir}}, {{relpath}}, {{notebook}}
  • Test: expands {{cursor_line}}, {{cursor_col}}
  • Test: expands {{clipboard}}
  • Test: expands custom variables
  • Test: handles {{input:prompt}} with user input
  • Test: handles {{ENV:VAR_NAME}} environment variables
  • Test: handles {{reg:x}} vim registers
  • Test: leaves unknown variables unchanged
  • Test: auto-builds context when not provided

Internal Functions

• new_from_template() - Create note from template picker
  • Test: shows template picker
  • Test: prompts for title
  • Test: calls zk.new with correct parameters
  • Test: handles zk-nvim not available
  • Test: handles no templates found
  • Test: handles user cancellation

Edge Cases to Test

• Empty template text
• Template with no variables
• Template with malformed variables
• Multiple variables on same line
• Nested variable-like patterns
• Very long template text
• Unicode in template text
• Special characters in variable values

Test File Location

tests/zk-extras/template_spec.lua

Priority

High - Template expansion is a key differentiator of this plugin