before functional changes by codex

test/basic/cstr-tick.basic.test.js

@@ -0,0 +1,42 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { Reactor_CSTR } = require('../../src/specificClass');
+const { makeReactorConfig } = require('../helpers/factories');
+
+const NUM_SPECIES = 13;
+
+test('Reactor_CSTR tick clips negative concentrations to zero', () => {
+  const reactor = new Reactor_CSTR(
+    makeReactorConfig({
+      reactor_type: 'CSTR',
+      volume: 1,
+      n_inlets: 1,
+      kla: NaN,
+      S_O_init: 0.1,
+      S_I_init: 0.1,
+      S_S_init: 0.1,
+      S_NH_init: 0.1,
+      S_N2_init: 0.1,
+      S_NO_init: 0.1,
+      S_HCO_init: 0.1,
+      X_I_init: 0.1,
+      X_S_init: 0.1,
+      X_H_init: 0.1,
+      X_STO_init: 0.1,
+      X_A_init: 0.1,
+      X_TS_init: 0.1,
+    }),
+  );
+
+  reactor.asm = {
+    compute_dC: () => Array(NUM_SPECIES).fill(0),
+  };
+  reactor.Fs[0] = 1;
+  reactor.Cs_in[0] = Array(NUM_SPECIES).fill(0);
+
+  reactor.tick(1);
+
+  assert.equal(reactor.state.every((v) => Number.isFinite(v) && v >= 0), true);
+  assert.equal(reactor.state.every((v) => v === 0), true);
+});