add biolink test

__test__/unittest/biolink.test.ts

@@ -0,0 +1,72 @@
+import { biolink } from '../../src/biolink';
+
+describe('Test BioLinkModel class', () => {
+  test('test reverse with correct predicate', () => {
+    const res = biolink.reverse('treats');
+    expect(res).toBe('treated_by');
+  });
+
+  test('test reverse with correct predicate if it contains underscore', () => {
+    const res = biolink.reverse('treated_by');
+    expect(res).toBe('treats');
+  });
+
+  test('test reverse with predicate having symmetric equal to true', () => {
+    const res = biolink.reverse('correlated_with');
+    expect(res).toBe('correlated_with');
+  });
+
+  test('test predicate with no inverse property and symmetric not equal to true', () => {
+    const res = biolink.reverse('has_phenotype');
+    expect(res).toBe('phenotype_of');
+  });
+
+  test('test predicate not exist in biolink model', () => {
+    const res = biolink.reverse('haha');
+    expect(res).toBeUndefined();
+  });
+
+  test('if input not string, return undefined', () => {
+    //@ts-expect-error: Explicitly testing for wrong type
+    const res = biolink.reverse(['dd']);
+    expect(res).toBeUndefined();
+  });
+
+  describe('Test getDescendants function', () => {
+    test('if input is in biolink model, return all its desendants and itself', () => {
+      const res = biolink.getDescendantClasses('MolecularEntity');
+      expect(res).toContain('SmallMolecule');
+      expect(res).toContain('NucleicAcidEntity');
+      expect(res).toContain('MolecularEntity');
+    });
+
+    test("if input is in biolink model but doesn't have descendants, return itself", () => {
+      const res = biolink.getDescendantClasses('Gene');
+      expect(res).toEqual(['Gene']);
+    });
+
+    test('if input is not in biolink, return itself', () => {
+      const res = biolink.getDescendantClasses('Gene1');
+      expect(res).toEqual('Gene1');
+    });
+  });
+
+  describe('Test getDescendantPredicates function', () => {
+    test('if input is in biolink model, return all its desendants and itself', () => {
+      const res = biolink.getDescendantPredicates('related_to');
+      expect(res).toContain('subclass_of');
+      expect(res).toContain('superclass_of');
+      expect(res).toContain('related_to');
+    });
+
+    test("if input is in biolink model but doesn't have descendants, return itself", () => {
+      const res = biolink.getDescendantPredicates('subclass_of');
+      expect(res).toEqual(['subclass_of']);
+    });
+
+    test('if input is not in biolink, return itself', () => {
+      const res = biolink.getDescendantPredicates('Gene1');
+      expect(res).toEqual(['Gene1']);
+    });
+  });
+});