added integration tests for log format

test/test_main.py

@@ -12,7 +12,9 @@
 # otherwise use the software for commercial activities involving the Arduino
 # software without disclosing the source code of your own applications. To purchase
 # a commercial license, send an email to license@arduino.cc.
+import os
 import json
+
 import semver
 
 
@@ -36,3 +38,37 @@ def test_version(run_command):
     assert parsed_out.get("Application", False) == "arduino-cli"
     assert isinstance(semver.parse(parsed_out.get("VersionString", False)), dict)
     assert isinstance(parsed_out.get("Commit", False), str)
+
+
+def test_log_options(run_command, data_dir):
+    """
+    using `version` as a test command
+    """
+
+    # no logs
+    out_lines = run_command("version").stdout.strip().split("\n")
+    assert len(out_lines) == 1
+
+    # plain text logs on stdoud
+    out_lines = run_command("version -v").stdout.strip().split("\n")
+    assert len(out_lines) > 1
+    assert out_lines[0].startswith("\x1b[36mINFO\x1b[0m")  # account for the colors
+
+    # plain text logs on file
+    log_file = os.path.join(data_dir, "log.txt")
+    run_command("version --log-file " + log_file)
+    with open(log_file) as f:
+        lines = f.readlines()
+        assert lines[0].startswith('time="')  # file format is different from console
+
+    # json on stdout
+    out_lines = run_command("version -v --log-format JSON").stdout.strip().split("\n")
+    lg = json.loads(out_lines[0])
+    assert "level" in lg
+
+    # json on file
+    log_file = os.path.join(data_dir, "log.json")
+    run_command("version --log-format json --log-file " + log_file)
+    with open(log_file) as f:
+        for line in f.readlines():
+            json.loads(line)