before functional changes by codex

test/basic/effluent-shape.basic.test.js

@@ -0,0 +1,38 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { Reactor_CSTR, Reactor_PFR } = require('../../src/specificClass');
+const { makeReactorConfig } = require('../helpers/factories');
+
+test('CSTR getEffluent returns flat concentration vector', () => {
+  const reactor = new Reactor_CSTR(makeReactorConfig({ reactor_type: 'CSTR', n_inlets: 1 }));
+  reactor.state = Array.from({ length: 13 }, (_, i) => i + 1);
+  reactor.Fs[0] = 5;
+
+  const effluent = reactor.getEffluent;
+
+  assert.equal(effluent.topic, 'Fluent');
+  assert.equal(effluent.payload.inlet, 0);
+  assert.equal(effluent.payload.F, 5);
+  assert.deepEqual(effluent.payload.C, reactor.state);
+});
+
+test('PFR getEffluent returns last slice concentration vector', () => {
+  const reactor = new Reactor_PFR(
+    makeReactorConfig({ reactor_type: 'PFR', n_inlets: 1, length: 10, resolution_L: 4 }),
+  );
+
+  reactor.state = [
+    Array(13).fill(10),
+    Array(13).fill(20),
+    Array(13).fill(30),
+    Array(13).fill(40),
+  ];
+  reactor.Fs[0] = 7;
+
+  const effluent = reactor.getEffluent;
+
+  assert.equal(effluent.topic, 'Fluent');
+  assert.equal(effluent.payload.F, 7);
+  assert.deepEqual(effluent.payload.C, Array(13).fill(40));
+});