add a test for search all (#419)

go.mod

@@ -43,6 +43,7 @@ require (
 	go.bug.st/serial.v1 v0.0.0-20180827123349-5f7892a7bb45
 	golang.org/x/net v0.0.0-20190311183353-d8887717615a
 	golang.org/x/text v0.3.0
+	google.golang.org/appengine v1.4.0 // indirect
 	google.golang.org/genproto v0.0.0-20190327125643-d831d65fe17d // indirect
 	google.golang.org/grpc v1.21.1
 	gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce // indirect

test/test_board.py

@@ -44,7 +44,15 @@ def test_core_listall(run_command):
 def test_core_search(run_command):
     url = "https://raw.githubusercontent.com/arduino/arduino-cli/master/test/testdata/test_index.json"
     assert run_command("core update-index --additional-urls={}".format(url))
-    # default search
+    # list all
+    result = run_command("core search")
+    assert result.ok
+    assert 3 < len(result.stdout.splitlines())
+    result = run_command("core search --format json")
+    assert result.ok
+    data = json.loads(result.stdout)
+    assert 1 < len(data)
+    # search a specific core
     result = run_command("core search avr")
     assert result.ok
     assert 2 < len(result.stdout.splitlines())