Restore diffuser in three-layer architecture

test/specificClass.test.js

@@ -0,0 +1,72 @@
+const Diffuser = require('../src/specificClass');
+
+function makeConfig(overrides = {}) {
+  return {
+    general: {
+      name: 'Zone_1',
+      logging: {
+        enabled: false,
+        logLevel: 'error',
+      },
+    },
+    functionality: {
+      softwareType: 'diffuser',
+      role: 'aeration diffuser',
+    },
+    diffuser: {
+      number: 1,
+      elements: 4,
+      density: 2.4,
+      waterHeight: 4.5,
+      alfaFactor: 0.7,
+      headerPressure: 0,
+      localAtmPressure: 1013.25,
+      waterDensity: 997,
+      ...overrides,
+    },
+  };
+}
+
+describe('diffuser specificClass', () => {
+  it('starts idle with zero production', () => {
+    const diffuser = new Diffuser(makeConfig());
+
+    expect(diffuser.idle).toBe(true);
+    expect(diffuser.getOutput()).toEqual(expect.objectContaining({
+      oKgo2H: 0,
+      oPLoss: expect.any(Number),
+    }));
+  });
+
+  it('calculates oxygen transfer and pressure once airflow is applied', () => {
+    const diffuser = new Diffuser(makeConfig());
+    diffuser.setFlow(24);
+
+    const output = diffuser.getOutput();
+    expect(diffuser.idle).toBe(false);
+    expect(output.oFlowElement).toBeGreaterThan(0);
+    expect(output.oOtr).toBeGreaterThan(0);
+    expect(output.oPLoss).toBeGreaterThan(diffuser.o_p_water);
+    expect(output.oKgo2H).toBeGreaterThan(0);
+  });
+
+  it('increases total pressure when water height rises', () => {
+    const diffuser = new Diffuser(makeConfig());
+    diffuser.setFlow(24);
+    const lowHeadLoss = diffuser.getOutput().oPLoss;
+
+    diffuser.setWaterHeight(6);
+    const highHeadLoss = diffuser.getOutput().oPLoss;
+
+    expect(highHeadLoss).toBeGreaterThan(lowHeadLoss);
+  });
+
+  it('raises warnings and alarms when flow per element is too low', () => {
+    const diffuser = new Diffuser(makeConfig({ elements: 1, waterHeight: 3 }));
+    diffuser.setFlow(0.5);
+
+    expect(diffuser.warning.state).toBe(true);
+    expect(diffuser.alarm.state).toBe(true);
+    expect(diffuser.getStatus().fill).toBe('red');
+  });
+});