初始化

tests/test_node_actions.mjs

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+import assert from "node:assert/strict";
+import test from "node:test";
+
+import {
+  nextAvailablePairedPosition,
+  pairedNodePosition,
+  uniquePublisherNode,
+} from "../web/node_actions.mjs";
+
+test("paired reader is placed to the right without mutating its source", () => {
+  const source = { pos: [100, 80], size: [250, 120] };
+
+  assert.deepEqual(pairedNodePosition(source), [390, 80]);
+  assert.deepEqual(source, { pos: [100, 80], size: [250, 120] });
+});
+
+test("additional paired readers avoid occupied node rectangles", () => {
+  const source = { pos: [100, 80], size: [250, 120] };
+  const reader = { size: [250, 80] };
+  const occupied = { pos: [390, 80], size: [250, 80] };
+
+  assert.deepEqual(
+    nextAvailablePairedPosition(source, reader, [source, occupied]),
+    [390, 178],
+  );
+});
+
+test("navigation accepts repeated entries from the same pipeline node", () => {
+  const pipeline = { id: 7 };
+
+  assert.equal(uniquePublisherNode([
+    { node: pipeline, key: "stage" },
+    { node: pipeline, key: "final" },
+  ]), pipeline);
+});
+
+test("navigation refuses ambiguous publisher nodes", () => {
+  assert.equal(uniquePublisherNode([
+    { node: { id: 1 } },
+    { node: { id: 2 } },
+  ]), null);
+  assert.equal(uniquePublisherNode([]), null);
+});