Initial Commit

packages/api-stack/api/api-graphql-yoga/src/federation/federation.test.ts

@@ -0,0 +1,61 @@
+import { createGraphqlRegistry, GraphqlError } from "@suaveplan/api-graphql";
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { federatePlugins } from "./federation.js";
+
+describe("federatePlugins", () => {
+    it("two plugins each extending Query both expose their fields", {
+        timeout: 5000,
+    }, () => {
+        const billing = createGraphqlRegistry();
+        billing.addTypes(
+            "type Query { _root: String } extend type Query { invoices: [String!]! }"
+        );
+        billing.addResolvers({ Query: { invoices: () => ["i_1"] } });
+
+        const crm = createGraphqlRegistry();
+        crm.addTypes("extend type Query { customers: [String!]! }");
+        crm.addResolvers({ Query: { customers: () => ["c_1"] } });
+
+        const result = federatePlugins([
+            {
+                plugin: "billing",
+                registry: billing as never,
+            },
+            { plugin: "crm", registry: crm as never },
+        ]);
+        expect(result.merged.sdl).toContain("invoices");
+        expect(result.merged.sdl).toContain("customers");
+        expect(result.resolvers.Query?.invoices).toBeDefined();
+        expect(result.resolvers.Query?.customers).toBeDefined();
+    });
+
+    it("same-field collision fails with GRAPHQL.SCHEMA_COLLISION", {
+        timeout: 5000,
+    }, () => {
+        const a = createGraphqlRegistry();
+        a.addTypes("type Query { invoices: [String!]! }");
+        const b = createGraphqlRegistry();
+        b.addTypes("type Query { invoices: [String!]! }");
+        expect(() =>
+            federatePlugins([
+                { plugin: "a", registry: a as never },
+                { plugin: "b", registry: b as never },
+            ])
+        ).toThrow(GraphqlError);
+    });
+
+    it("supports namespace wrapping", {
+        timeout: 5000,
+    }, () => {
+        const billing = createGraphqlRegistry();
+        billing.addTypes("extend type Query { invoices: [String!]! }");
+        const result = federatePlugins([
+            {
+                plugin: "billing",
+                registry: billing as never,
+                namespace: "Billing",
+            },
+        ]);
+        expect(result.merged.sdl).toContain("Billing");
+    });
+});