Improve asXId and make tests pass in release and debug mode.

tests/testutils/build.gradle.kts

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// TODO: Remove once https://youtrack.jetbrains.com/issue/KTIJ-19369 is fixed
+@Suppress("DSL_SCOPE_VIOLATION")
+plugins {
+    id("io.element.android-library")
+    alias(libs.plugins.ksp)
+}
+
+android {
+    namespace = "io.element.android.tests.testutils"
+}
+
+dependencies {
+    implementation(libs.test.junit)
+    implementation(libs.test.mockk)
+    implementation(libs.test.truth)
+    implementation(libs.test.turbine)
+    implementation(libs.coroutines.test)
+    implementation(projects.libraries.matrix.test)
+    implementation(projects.services.appnavstate.test)
+}

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/NullOrThrow.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.tests.testutils
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.Assert.assertThrows
+
+/**
+ * Assert that the lambda throws on debug and returns null on release.
+ */
+fun assertNullOrThrow(lambda: () -> Any?) {
+    if (BuildConfig.DEBUG) {
+        assertThrows(IllegalStateException::class.java) {
+            lambda()
+        }
+    } else {
+        assertThat(lambda()).isNull()
+    }
+}