Fix linter errors in CLI and tests

src/py_dvt_ate/app/cli.py

@@ -255,7 +255,7 @@ def export_report_cmd(
             "[red]Error:[/red] Report generation requires additional dependencies.\n"
             "Install with: [cyan]pip install py_dvt_ate[reports][/cyan]"
         )
-        raise typer.Exit(1)
+        raise typer.Exit(1) from None
 
     # Load config
     if config_file is None:
@@ -295,7 +295,7 @@ def export_report_cmd(
                 full_run_id = UUID(run_id)
             except ValueError:
                 console.print(f"[red]Error:[/red] Invalid run ID: '{run_id}'")
-                raise typer.Exit(1)
+                raise typer.Exit(1) from None
 
         # Create report config
         report_config = ReportConfig(
@@ -324,7 +324,7 @@ def export_report_cmd(
         raise
     except Exception as e:
         console.print(f"[red]Error generating report:[/red] {e}")
-        raise typer.Exit(1)
+        raise typer.Exit(1) from None
     finally:
         repo.close()
 

tests/integration/test_report_generation.py

@@ -3,9 +3,7 @@
 Tests the full report generation pipeline from test run to PDF output.
 """
 
-import json
 import tempfile
-from datetime import datetime
 from pathlib import Path
 from uuid import UUID, uuid4
 

tests/unit/reporting/test_html_renderer.py

@@ -5,7 +5,6 @@ from datetime import datetime
 import pytest
 
 from py_dvt_ate.data.models import TestResult, TestRun, TestStatus
-from py_dvt_ate.reporting.exceptions import TemplateRenderError
 from py_dvt_ate.reporting.models import ReportConfig, ReportData
 from py_dvt_ate.reporting.renderers.html import HTMLRenderer