fix: readd user test coherence score file

Author: kemuru

subgraph/core/tests/user.test.ts

@@ -0,0 +1,9 @@
+import { assert, test, describe } from "matchstick-as/assembly/index";
+import { BigInt } from "@graphprotocol/graph-ts";
+import { computeCoherenceScore } from "../src/entities/User";
+
+describe("Compute coherence score", () => {
+  test("Slam BigInts together", () => {
+    assert.bigIntEquals(BigInt.fromI32(8), computeCoherenceScore(BigInt.fromI32(1), BigInt.fromI32(2)));
+  });
+});