added coolprop

src/coolprop-node/test/propsSI.test.js

@@ -0,0 +1,50 @@
+const coolProp = require('../src/index.js');
+
+describe('PropsSI Direct Access', () => {
+    let PropsSI;
+
+    beforeAll(async () => {
+        // Get the PropsSI function
+        PropsSI = await coolProp.getPropsSI();
+    });
+
+    test('should initialize and return PropsSI function', async () => {
+        expect(typeof PropsSI).toBe('function');
+    });
+
+    test('should calculate saturation temperature of R134a at 1 bar', () => {
+        const pressure = 100000; // 1 bar in Pa
+        const temp = PropsSI('T', 'P', pressure, 'Q', 0, 'R134a');
+        expect(temp).toBeCloseTo(246.79, 1); // ~246.79 K at 1 bar
+    });
+
+    test('should calculate density of R134a at specific conditions', () => {
+        const temp = 300; // 300 K
+        const pressure = 100000; // 1 bar in Pa
+        const density = PropsSI('D', 'T', temp, 'P', pressure, 'R134a');
+        expect(density).toBeGreaterThan(0)
+        expect(density).toBeLessThan(Infinity);
+    });
+
+    test('should throw error for invalid refrigerant', () => {
+        const temp = 300;
+        const pressure = 100000;
+        expect(() => {
+            let result = PropsSI('D', 'T', temp, 'P', pressure, 'INVALID_REFRIGERANT');
+            if(result == Infinity) {
+                throw new Error('Infinity due to invalid refrigerant');
+            }
+        }).toThrow();
+    });
+
+    test('should throw error for invalid input parameter', () => {
+        const temp = 300;
+        const pressure = 100000;
+        expect(() => {
+            let result = PropsSI('INVALID_PARAM', 'T', temp, 'P', pressure, 'R134a');   
+            if(result == Infinity) {
+                throw new Error('Infinity due to invalid input parameter');
+            }
+        }).toThrow();
+    });
+});