test(audience-sdk): extend TestFixtures with more scenario values

Adds:
- Track properties: CustomPropKeyRecipeId, CraftingRecipeIronSword
- Distribution platform fixture: ProviderValue
- IdentityType fallback fixture: UnknownProvider
- Identity persistence fixtures: PreExistingId, PreExistingIdFromLastLaunch
- ConsentStore corruption fixture: NotAnInt
- Stress test userId: UserRaceStress
- DeleteData generic userId: SomeUser
- Templated prefix for GzipTests $"anon-{i}": AnonIdPrefix
- Minimal placeholders for MessageBuilder Identify / Alias arg slots
  (GenericUserId, GenericFromId, GenericToId, GenericFromType,
  GenericToType)

Migrates inline references in:
- DeleteDataTests
- ImmutableAudienceTests (Track props, race-stress userId, provider value)
- Core/IdentityTests (pre-existing-id fixtures)
- IdentityTypeTests (TestCase attribute now references the const)
- Core/ConsentStoreTests (corrupt-file fixture)
- Utility/GzipTests (anon-{i} templated prefix)
- Events/MessageBuilderTests (Identify / Alias placeholder slots)

Per the user's "everything random goes in a constant" stance.

Follow-up to SDK-272 (centralisation of duplicated literals).

Author: ImmutableJeffrey

src/Packages/Audience/Tests/Runtime/Core/ConsentStoreTests.cs

@@ -50,7 +50,7 @@ public void Load_MalformedFile_ReturnsNull()
             // A garbage value that isn't a valid enum int.
             var dir = AudiencePaths.AudienceDir(_testDir);
             Directory.CreateDirectory(dir);
-            File.WriteAllText(AudiencePaths.ConsentFile(_testDir), "not-an-int");
+            File.WriteAllText(AudiencePaths.ConsentFile(_testDir), TestFixtures.NotAnInt);
 
             Assert.IsNull(ConsentStore.Load(_testDir));
         }

src/Packages/Audience/Tests/Runtime/Core/IdentityTests.cs

@@ -39,7 +39,7 @@ public void NewDirectory_GeneratesNonEmptyId_AndWritesFile()
         public void ExistingFile_ReturnsPreviousId_WithoutGeneratingNew()
         {
             // Simulate a returning player by pre-writing an identity file (as a previous launch would have done).
-            var expectedId = "pre-existing-id-from-last-launch";
+            var expectedId = TestFixtures.PreExistingIdFromLastLaunch;
             var dir = AudiencePaths.AudienceDir(_testDir);
             Directory.CreateDirectory(dir);
             File.WriteAllText(AudiencePaths.IdentityFile(_testDir), expectedId);
@@ -93,7 +93,7 @@ public void Get_NoExistingFile_ReturnsNull_AndDoesNotCreate()
         [Test]
         public void Get_ExistingFile_ReturnsPersistedId()
         {
-            var expectedId = "pre-existing-id";
+            var expectedId = TestFixtures.PreExistingId;
             var dir = AudiencePaths.AudienceDir(_testDir);
             Directory.CreateDirectory(dir);
             File.WriteAllText(AudiencePaths.IdentityFile(_testDir), expectedId);

src/Packages/Audience/Tests/Runtime/DeleteDataTests.cs

@@ -136,7 +136,7 @@ public void DeleteData_DoesNotCreateAnonymousIdFile()
             var handler = new CapturingHandler();
             ImmutableAudience.Init(MakeConfig(handler, ConsentLevel.None));
 
-            ImmutableAudience.DeleteData(userId: "some-user");
+            ImmutableAudience.DeleteData(userId: TestFixtures.SomeUser);
             // Even with a userId request, the anonymousId file must not materialise.
             Thread.Sleep(250);
 

src/Packages/Audience/Tests/Runtime/Events/MessageBuilderTests.cs

@@ -80,8 +80,8 @@ public void Alias_AllFourFieldsPresent()
         public void AllMessages_ContextContainsLibraryAndLibraryVersion()
         {
             var track = MessageBuilder.Track(TestEventNames.PlaceholderEvt, null, null, PackageVersion);
-            var identify = MessageBuilder.Identify(null, "u1", IdentityType.Steam.ToLowercaseString(), PackageVersion);
-            var alias = MessageBuilder.Alias("f", "t1", "t", "t2", PackageVersion);
+            var identify = MessageBuilder.Identify(null, TestFixtures.GenericUserId, IdentityType.Steam.ToLowercaseString(), PackageVersion);
+            var alias = MessageBuilder.Alias(TestFixtures.GenericFromId, TestFixtures.GenericFromType, TestFixtures.GenericToId, TestFixtures.GenericToType, PackageVersion);
 
             foreach (var msg in new[] { track, identify, alias })
             {
@@ -95,8 +95,8 @@ public void AllMessages_ContextContainsLibraryAndLibraryVersion()
         public void AllMessages_SurfaceIsUnity()
         {
             var track = MessageBuilder.Track(TestEventNames.PlaceholderEvt, null, null, PackageVersion);
-            var identify = MessageBuilder.Identify(null, "u1", IdentityType.Steam.ToLowercaseString(), PackageVersion);
-            var alias = MessageBuilder.Alias("f", "t1", "t", "t2", PackageVersion);
+            var identify = MessageBuilder.Identify(null, TestFixtures.GenericUserId, IdentityType.Steam.ToLowercaseString(), PackageVersion);
+            var alias = MessageBuilder.Alias(TestFixtures.GenericFromId, TestFixtures.GenericFromType, TestFixtures.GenericToId, TestFixtures.GenericToType, PackageVersion);
 
             Assert.AreEqual(Constants.Surface, track[MessageFields.Surface]);
             Assert.AreEqual(Constants.Surface, identify[MessageFields.Surface]);
@@ -162,8 +162,8 @@ public void AllMessages_Context_LibraryAndLibraryVersionAreNonEmptyStrings()
         private static IEnumerable<Dictionary<string, object>> EveryMessageType()
         {
             yield return MessageBuilder.Track(TestEventNames.PlaceholderEvt, null, null, PackageVersion);
-            yield return MessageBuilder.Identify(null, "u1", IdentityType.Steam.ToLowercaseString(), PackageVersion);
-            yield return MessageBuilder.Alias("f", "t1", "t", "t2", PackageVersion);
+            yield return MessageBuilder.Identify(null, TestFixtures.GenericUserId, IdentityType.Steam.ToLowercaseString(), PackageVersion);
+            yield return MessageBuilder.Alias(TestFixtures.GenericFromId, TestFixtures.GenericFromType, TestFixtures.GenericToId, TestFixtures.GenericToType, PackageVersion);
         }
     }
 }

src/Packages/Audience/Tests/Runtime/IdentityTypeTests.cs

@@ -42,7 +42,7 @@ public void ParseLowercaseString_AcceptsMixedCase(string wire, IdentityType expe
 
         [TestCase(null)]
         [TestCase("")]
-        [TestCase("unknown_provider")]
+        [TestCase(TestFixtures.UnknownProvider)]
         [TestCase("steamX")]
         public void ParseLowercaseString_FallsBackToCustomForUnknownOrEmpty(string? wire)
         {

src/Packages/Audience/Tests/Runtime/ImmutableAudienceTests.cs

@@ -490,7 +490,7 @@ public void Track_CustomEvent_WritesEventToDisk()
 
             ImmutableAudience.Track(TestEventNames.CraftingStarted, new Dictionary<string, object>
             {
-                { "recipe_id", "iron_sword" }
+                { TestFixtures.CustomPropKeyRecipeId, TestFixtures.CraftingRecipeIronSword }
             });
 
             // Flush memory → disk
@@ -968,7 +968,7 @@ public void SetConsent_DowngradeToAnonymous_StressTest_NoUserIdLeak()
             // EnqueueTrack and this test leaks reproducibly.
             const int iterations = 200;
             const int trackersPerIteration = 4;
-            const string testUserId = "user_race_stress";
+            const string testUserId = TestFixtures.UserRaceStress;
 
             for (int iter = 0; iter < iterations; iter++)
             {
@@ -1224,7 +1224,7 @@ public void Init_GameLaunch_ConfigDistributionPlatformOverridesProvider()
         {
             ImmutableAudience.LaunchContextProvider = () => new Dictionary<string, object>
             {
-                [GameLaunchPropertyKeys.DistributionPlatform] = "provider_value",
+                [GameLaunchPropertyKeys.DistributionPlatform] = TestFixtures.ProviderValue,
             };
 
             var config = MakeConfig();
@@ -1237,7 +1237,7 @@ public void Init_GameLaunch_ConfigDistributionPlatformOverridesProvider()
                 .Select(File.ReadAllText)
                 .First(c => c.Contains($"\"{EventNames.GameLaunch}\""));
             StringAssert.Contains($"\"{GameLaunchPropertyKeys.DistributionPlatform}\":\"{DistributionPlatforms.Steam}\"", launchFile);
-            Assert.IsFalse(launchFile.Contains("provider_value"),
+            Assert.IsFalse(launchFile.Contains(TestFixtures.ProviderValue),
                 "config.DistributionPlatform should win over the provider's value");
         }
 

src/Packages/Audience/Tests/Runtime/TestFixtures.cs

@@ -33,5 +33,38 @@ internal static class TestFixtures
 
         // MilestoneReached event payload values
         internal const string MilestoneName = "first_boss_defeated";
+
+        // Track properties scenario data
+        internal const string CustomPropKeyRecipeId = "recipe_id";
+        internal const string CraftingRecipeIronSword = "iron_sword";
+
+        // Distribution platform fixture for the "platform from outside SDK" path.
+        internal const string ProviderValue = "provider_value";
+
+        // IdentityTypeExtensions.ParseLowercaseString fallback fixture.
+        internal const string UnknownProvider = "unknown_provider";
+
+        // Identity persistence fixtures (id read back from disk on next launch).
+        internal const string PreExistingId = "pre-existing-id";
+        internal const string PreExistingIdFromLastLaunch = "pre-existing-id-from-last-launch";
+
+        // ConsentStore corruption fixture (non-integer file content).
+        internal const string NotAnInt = "not-an-int";
+
+        // ThreadSafetyStressTests userId for race-stress scenarios.
+        internal const string UserRaceStress = "user_race_stress";
+
+        // DeleteDataTests generic userId.
+        internal const string SomeUser = "some-user";
+
+        // Prefix for GzipTests' $"anon-{i}" loop (per-message anonymous IDs).
+        internal const string AnonIdPrefix = "anon-";
+
+        // Placeholders for fixture slots where the value itself is not under test.
+        internal const string GenericUserId = "u1";
+        internal const string GenericFromId = "f";
+        internal const string GenericToId = "t";
+        internal const string GenericFromType = "t1";
+        internal const string GenericToType = "t2";
     }
 }

src/Packages/Audience/Tests/Runtime/Utility/GzipTests.cs

@@ -35,7 +35,7 @@ public void Compress_OutputIsSmallerThanInput_ForRealisticPayload()
                 if (i > 0) sb.Append(',');
                 sb.Append(WireFixture.Track(
                     (MessageFields.EventName, TestEventNames.LevelComplete),
-                    (MessageFields.AnonymousId, $"anon-{i}")));
+                    (MessageFields.AnonymousId, $"{TestFixtures.AnonIdPrefix}{i}")));
             }
 
             sb.Append("]}");