Read and wrote the JSON of four tests with the options of the app instead of copies

app/Tests/Provider/ModelListMetadataTests.cs

@@ -1,5 +1,6 @@
 using System.Text.Json;
 
+using AIStudio.Provider;
 using AIStudio.Provider.Groq;
 using AIStudio.Provider.OpenRouter;
 using AIStudio.Provider.Requesty;
@@ -19,17 +20,12 @@ namespace AIStudio.Tests.Provider;
 /// below are shortened answers of the real routes, so that a rename is caught here rather than by
 /// somebody wondering why their window never shows up.
 ///
-/// The options mirror what the providers deserialize with: names in snake case, which is what makes
+/// The answers are read with the options of the providers themselves: names in snake case, which is
-/// the renaming attributes necessary in the first place.
+/// what makes the renaming attributes necessary in the first place.
 /// </remarks>
 [TestFixture]
 public sealed class ModelListMetadataTests
 {
-    private static readonly JsonSerializerOptions AS_THE_PROVIDERS_READ_IT = new()
-    {
-        PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
-    };
-
     [Test]
     // ReSharper disable once InconsistentNaming
     public void VLLMStatesTheWindowItWasStartedWith()
@@ -41,7 +37,7 @@ public sealed class ModelListMetadataTests
                                                                                    { "id": "Qwen/Qwen3-32B", "object": "model", "owned_by": "vllm", "max_model_len": 32768 }
                                                                                ]
                                                                            }
-                                                                           """, AS_THE_PROVIDERS_READ_IT);
+                                                                           """, ProviderJsonOptions.OPTIONS);
 
         Assert.That(response.Data, Is.Not.Null);
         using (Assert.EnterMultipleScope())
@@ -63,7 +59,7 @@ public sealed class ModelListMetadataTests
                                                                                "object": "list",
                                                                                "data": [ { "id": "gemma3:1b", "object": "model" } ]
                                                                            }
-                                                                           """, AS_THE_PROVIDERS_READ_IT);
+                                                                           """, ProviderJsonOptions.OPTIONS);
 
         Assert.That(response.Data, Is.Not.Null);
         Assert.That(response.Data![0].ContextWindowTokens, Is.Null);
@@ -84,7 +80,7 @@ public sealed class ModelListMetadataTests
                                                                                    }
                                                                                ]
                                                                            }
-                                                                           """, AS_THE_PROVIDERS_READ_IT);
+                                                                           """, ProviderJsonOptions.OPTIONS);
 
         using (Assert.EnterMultipleScope())
         {
@@ -101,7 +97,7 @@ public sealed class ModelListMetadataTests
                                                                          "object": "list",
                                                                          "data": [ { "id": "llama-3.3-70b-versatile", "object": "model", "context_window": 131072 } ]
                                                                      }
-                                                                     """, AS_THE_PROVIDERS_READ_IT);
+                                                                     """, ProviderJsonOptions.OPTIONS);
 
         Assert.That(response.Data[0].ContextWindowTokens, Is.EqualTo(131_072));
     }
@@ -114,7 +110,7 @@ public sealed class ModelListMetadataTests
                                                                              "object": "list",
                                                                              "data": [ { "id": "openai/gpt-4o-mini", "object": "model", "api": "chat", "context_window": 128000, "max_output_tokens": 16384 } ]
                                                                          }
-                                                                         """, AS_THE_PROVIDERS_READ_IT);
+                                                                         """, ProviderJsonOptions.OPTIONS);
 
         Assert.That(response.Data[0].ContextWindowTokens, Is.EqualTo(128_000));
     }
@@ -127,7 +123,7 @@ public sealed class ModelListMetadataTests
                                                                             "object": "list",
                                                                             "data": [ { "id": "mistral-large-latest", "object": "model", "created": 1700000000, "owned_by": "mistralai", "max_context_length": 131072 } ]
                                                                         }
-                                                                        """, AS_THE_PROVIDERS_READ_IT);
+                                                                        """, ProviderJsonOptions.OPTIONS);
 
         Assert.That(response.Data[0].ContextWindowTokens, Is.EqualTo(131_072));
     }
@@ -147,7 +143,7 @@ public sealed class ModelListMetadataTests
                                                                                                        }
                                                                                                    ]
                                                                                                }
-                                                                                               """, AS_THE_PROVIDERS_READ_IT);
+                                                                                               """, ProviderJsonOptions.OPTIONS);
 
         Assert.That(response.Data[0].Providers, Is.Not.Null);
         Assert.That(response.Data[0].Providers![0].ContextWindowTokens, Is.EqualTo(64_000));

app/Tests/Provider/SelfHostedModelListTests.cs

@@ -25,11 +25,6 @@ namespace AIStudio.Tests.Provider;
 [TestFixture]
 public sealed class SelfHostedModelListTests
 {
-    private static readonly JsonSerializerOptions AS_THE_PROVIDERS_READ_IT = new()
-    {
-        PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
-    };
-
     /// <summary>
     /// What "GET /v1/models" answers on a local Ollama, shortened to the fields it sends.
     /// </summary>
@@ -51,7 +46,7 @@ public sealed class SelfHostedModelListTests
 
     private static IReadOnlyList<Model> TheModelsTheEngineListed()
     {
-        var response = JsonSerializer.Deserialize<SelfHostedModelsResponse>(WHAT_A_LOCAL_OLLAMA_ANSWERS, AS_THE_PROVIDERS_READ_IT);
+        var response = JsonSerializer.Deserialize<SelfHostedModelsResponse>(WHAT_A_LOCAL_OLLAMA_ANSWERS, ProviderJsonOptions.OPTIONS);
         Assert.That(response.Data, Is.Not.Null, "The answer has to be readable before anything can be sorted out of it.");
 
         return response.Data!

app/Tests/Tools/FileTypesTests.cs

@@ -3,6 +3,7 @@ using System.Text;
 using System.Text.Json;
 
 using AIStudio.Tools.Rust;
+using AIStudio.Tools.Services;
 using AIStudio.Tools.Validation;
 
 namespace AIStudio.Tests.Tools;
@@ -122,7 +123,7 @@ public class FileTypesTests
     public void DialogFilterMatchesTheRuntimeContract()
     {
         // The struct FileTypeFilter in runtime/src/file_actions.rs knows exactly these two fields:
-        var json = JsonSerializer.Serialize(FileTypes.ToFileDialogFilter(FileTypes.JSON), new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower });
+        var json = JsonSerializer.Serialize(FileTypes.ToFileDialogFilter(FileTypes.JSON), RustService.JSON_OPTIONS);
 
         Assert.That(json, Is.EqualTo("""{"filter_name":"JSON","filter_extensions":["json"]}"""));
     }

app/Tests/Tools/ShareFileResponseTests.cs

@@ -11,27 +11,18 @@ namespace AIStudio.Tests.Tools;
 /// <remarks>
 /// ShareFileResponse in runtime/src/share_sheet.rs names the outcome in snake case. A name which the
 /// app does not know would not fail anywhere: the enum converter falls back to the first member, and
-/// a share sheet which did not respond would go unnoticed again. The options mirror what RustService
+/// a share sheet which did not respond would go unnoticed again. The answers are read with the options
-/// deserializes with.
+/// of RustService itself.
 /// </remarks>
 [TestFixture]
 public sealed class ShareFileResponseTests
 {
-    private static readonly JsonSerializerOptions AS_THE_RUST_SERVICE_READS_IT = new()
-    {
-        PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
-        Converters =
-        {
-            new RustEnumConverter(),
-        },
-    };
-
     [TestCase("opened", ShareSheetOutcome.OPENED)]
     [TestCase("failed", ShareSheetOutcome.FAILED)]
     [TestCase("unresponsive", ShareSheetOutcome.UNRESPONSIVE)]
     public void TheAppReadsEveryOutcomeOfTheRuntime(string outcome, ShareSheetOutcome expectedOutcome)
     {
-        var response = JsonSerializer.Deserialize<ShareFileResponse>($$"""{"outcome":"{{outcome}}","issue":"The main window is not available."}""", AS_THE_RUST_SERVICE_READS_IT);
+        var response = JsonSerializer.Deserialize<ShareFileResponse>($$"""{"outcome":"{{outcome}}","issue":"The main window is not available."}""", RustService.JSON_OPTIONS);
 
         Assert.That(response, Is.Not.Null);
         using (Assert.EnterMultipleScope())
@@ -44,7 +35,7 @@ public sealed class ShareFileResponseTests
     [Test]
     public void AnUnknownOutcomeNeverCountsAsAnOpenedShareSheet()
     {
-        var response = JsonSerializer.Deserialize<ShareFileResponse>("""{"outcome":"vanished","issue":""}""", AS_THE_RUST_SERVICE_READS_IT);
+        var response = JsonSerializer.Deserialize<ShareFileResponse>("""{"outcome":"vanished","issue":""}""", RustService.JSON_OPTIONS);
 
         Assert.That(response?.Outcome, Is.EqualTo(ShareSheetOutcome.UNKNOWN));
     }