Restore circuit drag placement

tests/circuit-grid-insertion.test.ts

@@ -1,6 +1,7 @@
 import assert from "node:assert/strict";
 import { describe, it } from "node:test";
 import {
+  getAdjacentInsertionSortOrder,
   getInsertionSortOrder,
   isGridInsertionRowType,
   resolveGridInsertionIntent,
@@ -89,5 +90,26 @@ describe("circuit grid insertion", () => {
     assert.equal(getInsertionSortOrder(entries, "c"), 40);
     assert.equal(getInsertionSortOrder(entries), 40);
     assert.equal(getInsertionSortOrder([], "missing"), 10);
+    assert.equal(
+      getAdjacentInsertionSortOrder(entries, "a", "before"),
+      0
+    );
+    assert.equal(
+      getAdjacentInsertionSortOrder(entries, "b", "before"),
+      15
+    );
+    assert.equal(
+      getAdjacentInsertionSortOrder(entries, "b", "after"),
+      25
+    );
+    assert.throws(
+      () =>
+        getAdjacentInsertionSortOrder(
+          entries,
+          "missing",
+          "before"
+        ),
+      /nicht gefunden/
+    );
   });
 });