feat: some more tests, a checkpoint

lua/cp/test_render.lua

@@ -13,7 +13,7 @@ local function get_status_info(test_case)
   elseif test_case.status == 'fail' then
     if test_case.timed_out then
       return { text = 'TLE', highlight_group = 'CpTestError' }
-    elseif test_case.code and test_case.code ~= 0 then
+    elseif test_case.code and test_case.code >= 128 then
       return { text = 'RTE', highlight_group = 'CpTestError' }
     else
       return { text = 'WA', highlight_group = 'CpTestError' }

spec/config_spec.lua

@@ -66,13 +66,70 @@ describe('cp.config', function()
 
     it('validates hook functions', function()
       local invalid_config = {
-        hooks = { before_run = 'not_a_function' },
+        hooks = { before_test = 'not_a_function' },
       }
 
       assert.has_error(function()
         config.setup(invalid_config)
       end)
     end)
+
+    describe('test_panel config validation', function()
+      it('validates diff_mode values', function()
+        local invalid_config = {
+          test_panel = { diff_mode = 'invalid' },
+        }
+
+        assert.has_error(function()
+          config.setup(invalid_config)
+        end)
+      end)
+
+      it('validates toggle_key is non-empty string', function()
+        local invalid_config = {
+          test_panel = { toggle_key = '' },
+        }
+
+        assert.has_error(function()
+          config.setup(invalid_config)
+        end)
+      end)
+
+      it('validates next_test_key is non-empty string', function()
+        local invalid_config = {
+          test_panel = { next_test_key = nil },
+        }
+
+        assert.has_error(function()
+          config.setup(invalid_config)
+        end)
+      end)
+
+      it('validates prev_test_key is non-empty string', function()
+        local invalid_config = {
+          test_panel = { prev_test_key = '' },
+        }
+
+        assert.has_error(function()
+          config.setup(invalid_config)
+        end)
+      end)
+
+      it('accepts valid test_panel config', function()
+        local valid_config = {
+          test_panel = {
+            diff_mode = 'git',
+            toggle_key = 'x',
+            next_test_key = 'j',
+            prev_test_key = 'k',
+          },
+        }
+
+        assert.has_no.errors(function()
+          config.setup(valid_config)
+        end)
+      end)
+    end)
   end)
 
   describe('default_filename', function()

spec/diff_spec.lua

@@ -0,0 +1,42 @@
+describe('cp.diff', function()
+  local diff = require('cp.diff')
+
+  describe('get_available_backends', function()
+    it('returns vim and git backends')
+  end)
+
+  describe('get_backend', function()
+    it('returns vim backend by name')
+    it('returns git backend by name')
+    it('returns nil for invalid name')
+  end)
+
+  describe('is_git_available', function()
+    it('returns true when git command succeeds')
+    it('returns false when git command fails')
+  end)
+
+  describe('get_best_backend', function()
+    it('returns preferred backend when available')
+    it('falls back to vim when git unavailable')
+    it('defaults to vim backend')
+  end)
+
+  describe('vim backend', function()
+    it('returns content as-is')
+    it('returns nil highlights')
+  end)
+
+  describe('git backend', function()
+    it('creates temp files for diff')
+    it('returns raw diff output')
+    it('cleans up temp files')
+    it('handles no differences')
+    it('handles git command failure')
+  end)
+
+  describe('render_diff', function()
+    it('uses best available backend')
+    it('passes parameters to backend')
+  end)
+end)

spec/highlight_spec.lua

@@ -0,0 +1,39 @@
+describe('cp.highlight', function()
+  local highlight = require('cp.highlight')
+
+  describe('parse_diff_line', function()
+    it('parses added text markers {+text+}')
+    it('removes removed text markers [-text-]')
+    it('handles mixed add/remove markers')
+    it('calculates correct highlight positions')
+    it('handles text without markers')
+    it('handles empty text')
+  end)
+
+  describe('parse_git_diff', function()
+    it('skips git diff headers')
+    it('processes added lines')
+    it('ignores removed lines')
+    it('handles unchanged lines')
+    it('sets correct line numbers')
+    it('handles empty diff output')
+  end)
+
+  describe('apply_highlights', function()
+    it('clears existing highlights')
+    it('applies extmarks with correct positions')
+    it('uses correct highlight groups')
+    it('handles empty highlights')
+  end)
+
+  describe('create_namespace', function()
+    it('creates unique namespace')
+  end)
+
+  describe('parse_and_apply_diff', function()
+    it('parses diff and applies to buffer')
+    it('sets buffer content')
+    it('applies highlights')
+    it('returns content lines')
+  end)
+end)

spec/test_render_spec.lua

@@ -0,0 +1,30 @@
+describe('cp.test_render', function()
+  local test_render = require('cp.test_render')
+
+  describe('get_status_info', function()
+    it('returns AC for pass status')
+    it('returns WA for fail status with non-zero code')
+    it('returns TLE for timeout status')
+    it('returns RTE for fail with zero code')
+    it('returns empty for pending status')
+  end)
+
+  describe('render_test_list', function()
+    it('renders test cases with CP terminology')
+    it('shows current test with > prefix')
+    it('displays input only for current test')
+    it('handles empty test cases')
+    it('preserves input line breaks')
+  end)
+
+  describe('render_status_bar', function()
+    it('formats time and exit code')
+    it('handles missing time')
+    it('handles missing exit code')
+    it('returns empty for nil test case')
+  end)
+
+  describe('setup_highlights', function()
+    it('sets up all highlight groups')
+  end)
+end)