Python: Add integration test

python/extractor/cli-integration-test/hidden-files/query-default.expected

@@ -0,0 +1,5 @@
+|             name              |
++-------------------------------+
+| .hidden_file.py               |
+| foo.py                        |
+| visible_file_in_hidden_dir.py |

python/extractor/cli-integration-test/hidden-files/query-skipped.expected

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+|      name       |
++-----------------+
+| .hidden_file.py |
+| foo.py          |

python/extractor/cli-integration-test/hidden-files/query.ql

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+import python
+
+select any(File f).getShortName() as name order by name

python/extractor/cli-integration-test/hidden-files/repo_dir/foo.py

@@ -0,0 +1 @@
+print(42)

python/extractor/cli-integration-test/hidden-files/test.sh

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+#!/bin/bash
+
+set -Eeuo pipefail # see https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
+
+set -x
+
+CODEQL=${CODEQL:-codeql}
+
+SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+cd "$SCRIPTDIR"
+
+rm -rf db db-skipped
+
+# Test 1: Default behavior should be to extract files in hidden directories
+$CODEQL database create db --language python --source-root repo_dir/
+$CODEQL query run --database db query.ql > query-default.actual
+diff query-default.expected query-default.actual
+
+# Test 2: Setting the relevant extractor option to true skips files in hidden directories
+$CODEQL database create db-skipped --language python --source-root repo_dir/ --extractor-option python.skip_hidden_directories=true
+$CODEQL query run --database db-skipped query.ql > query-skipped.actual
+diff query-skipped.expected query-skipped.actual
+
+rm -rf db db-skipped