update end_block runner test

Author: shuaibbapputty

tests/runner-tests/end-block/subgraph.yaml

@@ -23,4 +23,24 @@ dataSources:
       eventHandlers:
         - event: TestEvent(string)
           handler: handleTestEvent
+      file: ./src/mapping.ts
+  # Datasource without endBlock to keep the subgraph running
+  - kind: ethereum/contract
+    name: Contract2
+    network: test
+    source:
+      address: "0x0000000000000000000000000000000000000001"
+      abi: Contract
+    mapping:
+      kind: ethereum/events
+      apiVersion: 0.0.7
+      language: wasm/assemblyscript
+      entities:
+        - Gravatar
+      abis:
+        - name: Contract
+          file: ./abis/Contract.abi
+      eventHandlers:
+        - event: TestEvent(string)
+          handler: handleTestEvent
       file: ./src/mapping.ts