before functional changes by codex

test/integration/upstream-reactor.integration.test.js

@@ -0,0 +1,48 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { Reactor_CSTR } = require('../../src/specificClass');
+const { makeReactorConfig } = require('../helpers/factories');
+
+const DAY_MS = 1000 * 60 * 60 * 24;
+
+test('registering upstream reactor subscribes to upstream stateChange events', () => {
+  const downstream = new Reactor_CSTR(makeReactorConfig({ reactor_type: 'CSTR' }));
+  const upstream = new Reactor_CSTR(makeReactorConfig({ reactor_type: 'CSTR' }));
+
+  let calledWith = null;
+  downstream.updateState = (timestamp) => {
+    calledWith = timestamp;
+  };
+
+  downstream.registerChild(upstream, 'reactor');
+  upstream.emitter.emit('stateChange', 12345);
+
+  assert.equal(downstream.upstreamReactor, upstream);
+  assert.equal(calledWith, 12345);
+});
+
+test('updateState pulls influent from upstream reactor effluent when linked', () => {
+  const downstream = new Reactor_CSTR(makeReactorConfig({ reactor_type: 'CSTR', n_inlets: 1, timeStep: 1 }));
+  const upstream = new Reactor_CSTR(makeReactorConfig({ reactor_type: 'CSTR', n_inlets: 1 }));
+
+  upstream.Fs[0] = 3;
+  upstream.state = Array(13).fill(11);
+
+  downstream.upstreamReactor = upstream;
+  downstream.currentTime = 0;
+  downstream.timeStep = 1;
+  downstream.speedUpFactor = 1;
+
+  let ticks = 0;
+  downstream.tick = () => {
+    ticks += 1;
+    return downstream.state;
+  };
+
+  downstream.updateState(DAY_MS);
+
+  assert.equal(ticks, 1);
+  assert.equal(downstream.Fs[0], 3);
+  assert.deepEqual(downstream.Cs_in[0], Array(13).fill(11));
+});