test: migrate to vitest

Author: JesusTheHun

graph.spec-d.ts

@@ -0,0 +1,37 @@
+import { describe, expectTypeOf, it } from 'vitest';
+import { Graph } from "./src/index.js";
+
+/**
+ * Those tests are not run. Their sole purpose is to test the types.
+ */
+describe('graph types', () => {
+  it('should return the given node type', () => {
+    const g = new Graph<string, { type: 'foo' | 'bar' }>();
+    const props = g.nodes();
+
+    expectTypeOf(props).toEqualTypeOf<string[]>();
+  });
+
+  it('should return the given edge properties type', () => {
+    const g = new Graph<string, { type: 'foo' | 'bar' }>();
+    const props = g.getEdgeProperties('a', 'b');
+
+    expectTypeOf(props).toEqualTypeOf<{ type: 'foo' | 'bar'}>();
+  });
+
+  it('should only accept nodes of the given type', () => {
+    const g = new Graph<{ id: string; label: string }>();
+    g.addNode({ id: 'a', label: 'test' });
+
+    // @ts-expect-error Wrong node type
+    g.addNode('a');
+  });
+
+  it('should only accept properties of the given type', () => {
+    const g = new Graph<string, { type: 'foo' | 'bar' }>();
+    g.setEdgeProperties('a', 'b', { type: 'bar' });
+
+    // @ts-expect-error Wrong properties type
+    g.setEdgeProperties('a', 'b', { type: 'nope' });
+  })
+});