Feature/improve tests syntax (#35667)

* feature/improve-tests-syntax, update increment

* feature/improve-tests-syntax, update increment

* feature/improve-tests-syntax, update increment

* feature/improve-tests-syntax, improve changelog

* feature/feature/improve-tests-syntax, add summary to proper changelog file

(cherry picked from commit 949d713)

CHANGELOG-developer.next.asciidoc

@@ -119,6 +119,21 @@ The list below covers the major changes between 7.0.0-rc2 and master only.
 - Introduce `libbeat/beat.Beat.OutputConfigReloader` {pull}28048[28048]
 - Update Go version to 1.17.1. {pull}27543[27543]
 - Whitelist `GCP_*` environment variables in dev tools {pull}28364[28364]
+- Add support for `credentials_json` in `gcp` module, all metricsets {pull}29584[29584]
+- Add gcp firestore metricset. {pull}29918[29918]
+- Added TESTING_FILEBEAT_FILEPATTERN option for filebeat module pytests {pull}30103[30103]
+- Improve tests files with shorter statements. {pull}35667[35667]
+- Add gcp dataproc metricset. {pull}30008[30008]
+- Add Github action for linting
+- Add regex support for drop_fields processor.
+- Improve compatibility and reduce flakyness of Python tests {pull}31588[31588]
+- Added `.python-version` file {pull}32323[32323]
+- Use `T.TempDir` to create temporary test directory {pull}33082[33082]
+- Add an option to disable event normalization when creating a `beat.Client`. {pull}33657[33657]
+- Add the file path of the instance lock on the error when it's is already locked {pull}33788[33788]
+- Add DropFields processor to js API {pull}33458[33458]
+- Add support for different folders when testing data {pull}34467[34467]
+- Add logging of metric registration in inputmon. {pull}35647[35647]
 
 ==== Deprecated
 

filebeat/tests/load/load.py

@@ -34,5 +34,5 @@
     randomString = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(length))
     log_message = timestamp + " " + str(count) + " " + str(uuid.uuid4()) + " " + randomString
     my_logger.debug(log_message)
-    count = count + 1
+    count += 1
     time.sleep(sleepTime)

filebeat/tests/open-file-handlers/log_file.py

@@ -22,7 +22,7 @@
 while True:
     # for i in range(0, 10000):
     time.sleep(random.uniform(0, 0.1))
-    i = i + 1
+    i += 1
     # Tries to cause some more heavy peaks
     events = random.randrange(10) + 1
     for n in range(events):