config merge

src/test/kotlin/io/emeraldpay/dshackle/config/ChainsConfigTest.kt

@@ -0,0 +1,44 @@
+package io.emeraldpay.dshackle.config
+
+import io.emeraldpay.dshackle.Chain
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+
+internal class ChainsConfigTest {
+
+    @Test
+    fun patch() {
+        val orig = ChainsConfig(
+            mapOf(
+                Chain.BITCOIN to ChainsConfig.RawChainConfig(0, 0),
+                Chain.ETHEREUM to ChainsConfig.RawChainConfig(1, 2),
+                Chain.POLYGON to ChainsConfig.RawChainConfig(3, 4)
+            ),
+            ChainsConfig.RawChainConfig(1, 2)
+        )
+
+        val patch = ChainsConfig(
+            mapOf(
+                Chain.BITCOIN to ChainsConfig.RawChainConfig(null, 10000),
+                Chain.POLYGON to ChainsConfig.RawChainConfig(10, 11),
+                Chain.ARBITRUM to ChainsConfig.RawChainConfig(999, 999)
+            ),
+            ChainsConfig.RawChainConfig(100, null)
+        )
+
+        val res = orig.patch(patch)
+
+        assertEquals(
+            ChainsConfig(
+                mapOf(
+                    Chain.BITCOIN to ChainsConfig.RawChainConfig(0, 10000),
+                    Chain.ETHEREUM to ChainsConfig.RawChainConfig(1, 2),
+                    Chain.POLYGON to ChainsConfig.RawChainConfig(10, 11),
+                    Chain.ARBITRUM to ChainsConfig.RawChainConfig(999, 999)
+                ),
+                ChainsConfig.RawChainConfig(100, 2)
+            ),
+            res
+        )
+    }
+}