solution: erc20 tokens config

src/test/groovy/io/emeraldpay/dshackle/config/TokensConfigReaderSpec.groovy

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+/**
+ * Copyright (c) 2020 EmeraldPay, Inc
+ *
+ * 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.emeraldpay.dshackle.config
+
+import io.emeraldpay.grpc.Chain
+import spock.lang.Specification
+
+class TokensConfigReaderSpec extends Specification {
+
+    TokensConfigReader reader = new TokensConfigReader()
+
+    def "Read basic"() {
+        setup:
+        def config = this.class.getClassLoader().getResourceAsStream("tokens/basic.yaml")
+        when:
+        def act = reader.read(config)
+
+        then:
+        act != null
+        act.tokens.size() == 2
+        with(act.tokens[0]) {
+            id == "dai"
+            blockchain == Chain.ETHEREUM
+            name == "DAI"
+            type == TokensConfig.Type.ERC20
+            address == "0x6B175474E89094C44Da98b954EedeAC495271d0F"
+        }
+        with(act.tokens[1]) {
+            id == "tether"
+            blockchain == Chain.ETHEREUM
+            name == "Tether"
+            type == TokensConfig.Type.ERC20
+            address == "0xdac17f958d2ee523a2206206994597c13d831ec7"
+        }
+
+    }
+}

src/test/resources/tokens/basic.yaml

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+tokens:
+  - id: dai
+    blockchain: ethereum
+    name: DAI
+    type: ERC-20
+    address: 0x6B175474E89094C44Da98b954EedeAC495271d0F
+  - id: tether
+    blockchain: ethereum
+    name: Tether
+    type: ERC-20
+    address: 0xdac17f958d2ee523a2206206994597c13d831ec7