test(shorebird_cli): stop generating diff file during test runs (#2053)

packages/shorebird_cli/test/src/commands/patch_new/ios_patcher_test.dart

@@ -483,8 +483,9 @@ void main() {
             final zipFile = invocation.namedArguments[#zipFile] as File;
             final outDir =
                 invocation.namedArguments[#outputDirectory] as Directory;
-            File(p.join(outDir.path, '${p.basename(zipFile.path)}.zip'))
-                .createSync();
+            File(
+              p.join(outDir.path, '${p.basename(zipFile.path)}.zip'),
+            ).createSync();
           });
           when(() => artifactManager.getXcarchiveDirectory()).thenReturn(
             Directory(

packages/shorebird_cli/test/src/executables/patch_executable_test.dart

@@ -54,8 +54,9 @@ void main() {
 
       cacheArtifactDirectory = Directory.systemTemp.createTempSync();
       cache = MockCache();
-      when(() => cache.getArtifactDirectory(any()))
-          .thenReturn(cacheArtifactDirectory);
+      when(
+        () => cache.getArtifactDirectory(any()),
+      ).thenReturn(cacheArtifactDirectory);
       when(() => cache.updateAll()).thenAnswer((_) async {});
     });
 
@@ -64,8 +65,9 @@ void main() {
       final releaseArtifactFile = File(
         p.join(tmpDir.path, 'release_artifact'),
       )..createSync(recursive: true);
-      final patchArtifactFile = File(p.join(tmpDir.path, 'patch_artifact'))
-        ..createSync(recursive: true);
+      final patchArtifactFile = File(
+        p.join(tmpDir.path, 'patch_artifact'),
+      )..createSync(recursive: true);
 
       await runWithOverrides(
         () => patchExecutable.run(
@@ -96,6 +98,14 @@ void main() {
       when(() => patchProcessResult.stderr).thenReturn(stderr);
       when(() => patchProcessResult.stdout).thenReturn(stdout);
 
+      when(
+        () => shorebirdProcess.run(
+          any(that: endsWith('patch')),
+          any(),
+          runInShell: any(named: 'runInShell'),
+        ),
+      ).thenAnswer((_) async => patchProcessResult);
+
       await expectLater(
         () => runWithOverrides(
           () => patchExecutable.run(