before functional changes by Codex

test/integration/coolprop.integration.test.js

@@ -20,3 +20,20 @@ test('calcEfficiency runs through coolprop path without mocks', () => {
   assert.equal(typeof eff, 'number');
   assert.ok(eff > 0);
 });
+
+test('predictions use initialized medium pressure and not the minimum-pressure fallback', () => {
+  const machine = new Machine(makeMachineConfig(), makeStateConfig({ state: { current: 'operational' } }));
+
+  const mediumUpstreamMbar = 700;
+  const mediumDownstreamMbar = 1100;
+  machine.updateMeasuredPressure(mediumUpstreamMbar, 'upstream', { timestamp: Date.now(), unit: 'mbar', childName: 'test-pt-up' });
+  machine.updateMeasuredPressure(mediumDownstreamMbar, 'downstream', { timestamp: Date.now(), unit: 'mbar', childName: 'test-pt-down' });
+
+  const pressureStatus = machine.getPressureInitializationStatus();
+  assert.equal(pressureStatus.initialized, true);
+  assert.equal(pressureStatus.hasDifferential, true);
+
+  const expectedDiff = mediumDownstreamMbar - mediumUpstreamMbar;
+  assert.equal(Math.round(machine.predictFlow.fDimension), expectedDiff);
+  assert.ok(machine.predictFlow.fDimension > 0);
+});