Merge main and common module to simplify.

app/src/test/java/testhelpers/json/JsonExtensions.kt

@@ -0,0 +1,29 @@
+package testhelpers.json
+
+import com.squareup.moshi.JsonReader
+import com.squareup.moshi.Moshi
+import okio.Buffer
+import okio.ByteString.Companion.encode
+import okio.buffer
+import okio.sink
+import java.io.File
+
+
+fun String.toComparableJson(): String {
+    val value = Buffer().use {
+        it.writeUtf8(this)
+        val reader = JsonReader.of(it)
+        reader.readJsonValue()
+    }
+
+    val adapter = Moshi.Builder().build().adapter(Any::class.java).indent("    ")
+
+    return adapter.toJson(value)
+}
+
+fun String.writeToFile(file: File) = encode().let { text ->
+    require(!file.exists())
+    file.parentFile?.mkdirs()
+    file.createNewFile()
+    file.sink().buffer().use { it.write(text) }
+}