fix: Internal error when redirecting CLI stdout on Windows

Signed-off-by: Dmitry Dygalo <dmitry@dygalo.dev>

docs/changelog.rst

@@ -14,6 +14,10 @@ Changelog
 - Clarify error message on unsupported recursive references.
 - Report more details on some internal errors instead of "Unknown Schema Error".
 
+**Fixed**
+
+- Internal error on Windows when the CLI output is redirected to a file and code samples contain non CP1252 characters.
+
 .. _v3.27.1:
 
 :version:`3.27.1 <v3.27.0...v3.27.1>` - 2024-04-29

src/schemathesis/cli/context.py

@@ -55,6 +55,8 @@ class ExecutionContext:
     report: ServiceReportContext | FileReportContext | None = None
     probes: list[ProbeRun] | None = None
     analysis: Result[AnalysisResult, Exception] | None = None
+    # Special flag to display a warning about Windows-specific encoding issue
+    encountered_windows_encoding_issue: bool = False
 
     @deprecated_property(removed_in="4.0", replacement="show_trace")
     def show_errors_tracebacks(self) -> bool:

src/schemathesis/cli/output/default.py

@@ -318,9 +318,23 @@ def display_failures_for_single_test(context: ExecutionContext, result: Serializ
                             except UnicodeDecodeError:
                                 click.echo("\n    <BINARY>")
 
-        click.echo(
-            f"\n{bold('Reproduce with')}: \n\n    {code_sample}\n",
-        )
+        try:
+            click.echo(
+                f"\n{bold('Reproduce with')}: \n\n    {code_sample}\n",
+            )
+        except UnicodeEncodeError:
+            # On Windows it may fail when redirecting the output to a file
+            # because it uses a different encoding than the console encoding and the default
+            # is cp1252, which doesn't support some Unicode characters.
+            # In this case, display a stub message and set a flag to display a warning at the end
+            if platform.system() != "Windows":
+                raise
+            click.echo(
+                f"\n{bold('Reproduce with')}: \n\n"
+                "    CAN NOT DISPLAY THIS CODE SAMPLE DUE TO TERMINAL LIMITATIONS.\n"
+                "    SEE DETAILS AT THE END OF THE OUTPUT\n",
+            )
+            context.encountered_windows_encoding_issue = True
 
 
 def display_application_logs(context: ExecutionContext, event: events.Finished) -> None:
@@ -466,6 +480,17 @@ def display_statistic(context: ExecutionContext, event: events.Finished) -> None
             seed_option = f"`--hypothesis-seed={context.seed}`"
             click.secho(f"\n{bold('Note')}: To replicate these test failures, rerun with {bold(seed_option)}")
 
+    if context.encountered_windows_encoding_issue:
+        click.echo()
+        title = click.style("WARNING:", bold=True, fg="yellow")
+        name = click.style("PYTHONIOENCODING", bold=True)
+        value = click.style("utf8", bold=True)
+        warning = (
+            "Some code samples could not be displayed due to terminal limitations on Windows.\n"
+            f"To resolve this set the '{name}' environment variable to '{value}' and rerun your command."
+        )
+        click.secho(f"{title} {warning}")
+
     if context.report is not None and not context.is_interrupted:
         if isinstance(context.report, FileReportContext):
             click.echo()