testsuite: add tests for writing agfilter status

Problem: the testsuite doesn't have tests for the new find behavior

Add tests.

t/data/resource/expected/find-format/jgf.expected.agfilter.json

@@ -0,0 +1,41 @@
+{
+  "graph": {
+    "nodes": [
+      {
+        "id": "1",
+        "metadata": {
+          "type": "node",
+          "basename": "cab",
+          "id": 1234,
+          "exclusive": true,
+          "paths": {
+            "containment": "/cluster0/cab1234"
+          },
+          "agfilter": {
+            "core": "used:0, total:16"
+          }
+        }
+      },
+      {
+        "id": "0",
+        "metadata": {
+          "type": "cluster",
+          "id": 0,
+          "exclusive": true,
+          "paths": {
+            "containment": "/cluster0"
+          },
+          "agfilter": {
+            "core": "used:0, total:16"
+          }
+        }
+      }
+    ],
+    "edges": [
+      {
+        "source": "0",
+        "target": "1"
+      }
+    ]
+  }
+}

t/t1015-find-format.t

@@ -93,6 +93,13 @@ test_expect_success 'find/status: find status=up format=jgf works' '
     test_cmp jgf.query.json jgf.json
 '
 
+test_expect_success 'find/agfilter: find agfilter=true format=jgf works' '
+    flux ion-resource find --format=jgf agfilter=true \
+         | tail -1 > jgf.agfilter.raw.json &&
+    normalize_json < jgf.agfilter.raw.json > jgf.json &&
+    test_cmp ${expected_basepath}/jgf.expected.agfilter.json jgf.json
+'
+
 test_expect_success 'find/status: removing fluxion modules' '
     remove_qmanager &&
     remove_resource