Introduce JsonProvider.

It will ensure that classes are using the correct Json instances in the unit tests.

libraries/androidutils/build.gradle.kts

@@ -32,6 +32,7 @@ dependencies {
     implementation(libs.androidx.recyclerview)
     implementation(libs.androidx.exifinterface)
     implementation(libs.androidx.datastore.preferences)
+    implementation(libs.serialization.json)
     api(libs.androidx.browser)
 
     testCommonDependencies(libs)

libraries/androidutils/src/main/kotlin/io/element/android/libraries/androidutils/json/JsonProvider.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.androidutils.json
+
+import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.ContributesBinding
+import dev.zacsweers.metro.Inject
+import dev.zacsweers.metro.Provider
+import dev.zacsweers.metro.SingleIn
+import kotlinx.serialization.json.Json
+
+/**
+ * Provides a Json instance configured to ignore unknown keys.
+ */
+interface JsonProvider : Provider<Json>
+
+@ContributesBinding(AppScope::class)
+@SingleIn(AppScope::class)
+@Inject
+class DefaultJsonProvider : JsonProvider {
+    private val json: Json by lazy { Json { ignoreUnknownKeys = true } }
+    override fun invoke() = json
+}