1 files changed, 19 insertions, 0 deletions
diff --git a/web/test/tasks-board.test.mjs b/web/test/tasks-board.test.mjs
index 85bb04a..560e8c8 100644
--- a/web/test/tasks-board.test.mjs
+++ b/web/test/tasks-board.test.mjs
@@ -42,6 +42,7 @@ describe('columnForTaskState', () => {
     ]) {
       assert.ok(allStates.includes(s), `${s} missing from any column`);
     }
+    assert.equal(new Set(allStates).size, allStates.length, 'a state must map to exactly one column');
   });
 });
 
@@ -120,6 +121,24 @@ describe('groupTasksByColumn', () => {
     assert.deepEqual(groups.running.map(t => t.id), ['newer', 'older']);
   });
 
+  it('sorts a task with no created_at LAST in an ascending column (queue)', () => {
+    const tasks = [
+      { id: 'no-date', state: 'PENDING' },
+      { id: 'has-date', state: 'QUEUED', created_at: '2024-01-01T00:00:00Z' },
+    ];
+    const groups = groupTasksByColumn(tasks);
+    assert.deepEqual(groups.queue.map(t => t.id), ['has-date', 'no-date']);
+  });
+
+  it('sorts a task with no created_at LAST in a descending column (interrupted)', () => {
+    const tasks = [
+      { id: 'no-date', state: 'FAILED' },
+      { id: 'has-date', state: 'CANCELLED', created_at: '2024-01-01T00:00:00Z' },
+    ];
+    const groups = groupTasksByColumn(tasks);
+    assert.deepEqual(groups.interrupted.map(t => t.id), ['has-date', 'no-date']);
+  });
+
   it('handles null/undefined gracefully', () => {
     const groups = groupTasksByColumn(null);
     for (const col of TASK_COLUMNS) {