feat: add comprehensive end-to-end test suite

e2e/test_rapid_key_mash.ts

@@ -0,0 +1,71 @@
+import { setupTest, startEngine, startClientInTmux, openCmdFifo, writeFifoCommand, wait, tmuxSendKeys, tmuxCapturePane, teardownTest } from './test_utils';
+
+export async function testRapidKeyMashConsistency(): Promise<void> {
+  console.log("\nTest: RAPID KEY MASH CONSISTENCY (burst of 10 keys, verify pane)");
+  setupTest();
+  const engine = await startEngine();
+  await startClientInTmux();
+  openCmdFifo();
+  await wait(500);
+
+  // Add channels up to column 5
+  for (let i = 1; i <= 5; i++) {
+    writeFifoCommand("add");
+    await wait(100);
+  }
+
+  const ITERATIONS = 20;
+  for (let iter = 0; iter < ITERATIONS; iter++) {
+    const seed = iter * 7;
+    let keys = "";
+    for (let k = 0; k < 10; k++) {
+      const dir = (seed + k) % 4;
+      switch (dir) {
+        case 0: keys += "l"; break;
+        case 1: keys += "h"; break;
+        case 2: keys += "j"; break;
+        case 3: keys += "k"; break;
+      }
+    }
+    keys += "t"; // record
+    tmuxSendKeys("looper", "0", keys);
+    await wait(500);
+
+    // Capture pane
+    const pane = tmuxCapturePane("looper", "0");
+
+    // 1. Selected line must be present
+    const selMatch = pane.match(/Selected: Grid \d+, Row (\d+), Col (\d+)/);
+    if (!selMatch) {
+      console.log(`  FAIL at iteration ${iter}: No selected line in pane`);
+      console.log("  Pane:\n" + pane.slice(0, 500));
+      engine.kill(); teardownTest();
+      throw new Error("Selected line missing after burst");
+    }
+
+    const row = parseInt(selMatch[1]);
+    const col = parseInt(selMatch[2]);
+    if (row < 0 || row > 7 || col < 0 || col > 7) {
+      console.log(`  FAIL at iteration ${iter}: selected (${row},${col}) out of bounds`);
+      engine.kill(); teardownTest();
+      throw new Error("Selected cell out of bounds after burst");
+    }
+
+    // 2. At least one 'R' must appear in the pane
+    const hasR = pane.includes("R");
+    if (!hasR) {
+      console.log(`  FAIL at iteration ${iter}: No 'R' found after burst`);
+      console.log("  Pane:\n" + pane.slice(0, 1000));
+      engine.kill(); teardownTest();
+      throw new Error("No 'R' indicator after rapid key mash");
+    }
+
+    // 3. Toggle back to idle for next iteration
+    tmuxSendKeys("looper", "0", "t");
+    await wait(300);
+  }
+
+  console.log("  PASS: Rapid key mash consistency maintained over " + ITERATIONS + " iterations");
+  engine.kill();
+  teardownTest();
+}