Moving the EmptyOTS resolver to Quartz for test cases

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip03Timestamp/OtsResolverBuilder.kt

@@ -20,6 +20,18 @@
  */
 package com.vitorpamplona.quartz.nip03Timestamp
 
+import com.vitorpamplona.quartz.nip03Timestamp.ots.EmptyBitcoinExplorer
+import com.vitorpamplona.quartz.nip03Timestamp.ots.EmptyRemoteCalendar
+
 interface OtsResolverBuilder {
     fun build(): OtsResolver
 }
+
+val EmptyOtsResolverBuilder =
+    object : OtsResolverBuilder {
+        override fun build(): OtsResolver =
+            OtsResolver(
+                explorer = EmptyBitcoinExplorer,
+                calendar = EmptyRemoteCalendar,
+            )
+    }

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip03Timestamp/ots/BitcoinExplorer.kt

@@ -39,3 +39,9 @@ interface BitcoinExplorer {
      */
     suspend fun blockHash(height: Int): String
 }
+
+object EmptyBitcoinExplorer : BitcoinExplorer {
+    override suspend fun block(hash: String) = TODO("Not yet implemented")
+
+    override suspend fun blockHash(height: Int) = TODO("Not yet implemented")
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip03Timestamp/ots/RemoteCalendar.kt

@@ -55,3 +55,15 @@ interface RemoteCalendar {
         commitment: ByteArray,
     ): Timestamp
 }
+
+object EmptyRemoteCalendar : RemoteCalendar {
+    override suspend fun submit(
+        url: String,
+        digest: ByteArray,
+    ) = TODO("Not yet implemented")
+
+    override suspend fun getTimestamp(
+        url: String,
+        commitment: ByteArray,
+    ) = TODO("Not yet implemented")
+}