Report missing previous input

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/run.lua b/tests/run.lua
index c968d87..69f5087 100644
--- a/tests/run.lua
+++ b/tests/run.lua
@@ -5257,6 +5257,34 @@ test("Acquisition compares first codes with previous-input triggers", function()
   same(nil, acquisition_service.match_previous_input_trigger(122, { "xy" }))
 end)
 
+test("Missing previous input preserves cursor and emits exact diagnostic", function()
+  fresh_sequence_state()
+  local origin = domain.Position.new(1, 2)
+  local host = MemoryHost.new({
+    buffer_lines = { "abc" },
+    cursor = origin,
+    configuration = {
+      mark_cursor = false,
+      hide_cursor_on_cmdline = false,
+      repeat_last_char_inputs = { "\r" },
+    },
+    input_packets = { { kind = "text", text = "\r" } },
+  })
+  local service = acquisition_service.new(host)
+
+  local result = service:acquire("f", "n", origin, nil, nil)
+  truthy(result.missing_previous_input)
+  same(nil, result.target)
+  same(origin, host:read_cursor())
+  same(1, #host:diagnostics())
+  same("error", host:diagnostics()[1].level)
+  same("Previous input not found.", host:diagnostics()[1].text)
+  same(
+    acquisition_service.PREVIOUS_INPUT_NOT_FOUND,
+    host:diagnostics()[1].text
+  )
+end)
+
 for _, item in ipairs(tests) do
   local ok, failure = xpcall(item.body, debug.traceback)
   if not ok then