Add integration tests for multiple subgraph datasources

tests/integration-tests/multiple-subgraph-data-sources/abis/Contract.abi

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+[
+    {
+        "anonymous": false,
+        "inputs": [
+            {
+                "indexed": false,
+                "internalType": "string",
+                "name": "testCommand",
+                "type": "string"
+            }
+        ],
+        "name": "TestEvent",
+        "type": "event"
+    }
+]

tests/integration-tests/multiple-subgraph-data-sources/package.json

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+{
+  "name": "subgraph-data-sources",
+  "version": "0.1.0",
+  "scripts": {
+    "codegen": "graph codegen --skip-migrations",
+    "create:test": "graph create test/subgraph-data-sources --node $GRAPH_NODE_ADMIN_URI",
+    "deploy:test": "graph deploy test/subgraph-data-sources --version-label v0.0.1 --ipfs $IPFS_URI --node $GRAPH_NODE_ADMIN_URI"
+  },
+  "devDependencies": {
+    "@graphprotocol/graph-cli": "0.79.0-alpha-20240711124603-49edf22",
+    "@graphprotocol/graph-ts": "0.31.0"
+  }
+}

tests/integration-tests/multiple-subgraph-data-sources/schema.graphql

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+type MirrorBlock @entity {
+  id: String!
+  number: BigInt!
+  hash: Bytes!
+  testMessage: String
+}

tests/integration-tests/multiple-subgraph-data-sources/src/mapping.ts

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+import { Entity, log, store } from '@graphprotocol/graph-ts';
+import { MirrorBlock } from '../generated/schema';
+
+export class EntityTrigger {
+  constructor(
+    public entityOp: u32,
+    public entityType: string,
+    public entity: Entity,
+    public vid: i64,
+  ) {}
+}
+
+export function handleEntity(trigger: EntityTrigger): void {
+  let blockEntity = trigger.entity;
+  let blockNumber = blockEntity.getBigInt('number');
+  let blockHash = blockEntity.getBytes('hash');
+  let testMessage = blockEntity.get('testMessage');
+  let id = blockEntity.getString('id');
+
+  log.info('Block number: {}', [blockNumber.toString()]);
+
+  if (trigger.entityOp == 2) {
+    log.info('Removing block entity with id: {}', [id]);
+    store.remove('MirrorBlock', id);
+    return;
+  }
+
+  let block = loadOrCreateMirrorBlock(id);
+  block.number = blockNumber;
+  block.hash = blockHash;
+  if (testMessage) {
+    block.testMessage = testMessage.toString();
+  }
+
+  block.save();
+}
+
+export function loadOrCreateMirrorBlock(id: string): MirrorBlock {
+  let block = MirrorBlock.load(id);
+  if (!block) {
+    log.info('Creating new block entity with id: {}', [id]);
+    block = new MirrorBlock(id);
+  }
+
+  return block;
+}

tests/integration-tests/multiple-subgraph-data-sources/subgraph.yaml

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+specVersion: 1.3.0
+schema:
+  file: ./schema.graphql
+dataSources:
+  - kind: subgraph
+    name: Contract
+    network: test
+    source:
+      address: 'Qmaqf8cRxfxbduZppSHKG9DMuX5JZPMoGuwGb2DQuo48sq'
+      startBlock: 0
+    mapping:
+      apiVersion: 0.0.7
+      language: wasm/assemblyscript
+      entities:
+        - Gravatar
+      handlers:
+        - handler: handleEntity
+          entity: Block
+        - handler: handleEntity
+          entity: Block2
+      file: ./src/mapping.ts