Add retry strategy tests (#14)

src/test/java/com/vinted/kafka/connect/vespa/VespaSinkConfigTest.java

@@ -0,0 +1,34 @@
+package com.vinted.kafka.connect.vespa;
+
+import ai.vespa.feed.client.FeedClient;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertIterableEquals;
+
+public class VespaSinkConfigTest {
+    private final Map<String, String> params = new HashMap<>();
+
+    @Test
+    void createsDefaultRetryStrategy() {
+        VespaSinkConfig config = new VespaSinkConfig(params);
+
+        assertEquals(10, config.retryStrategyRetries);
+        assertIterableEquals(Arrays.asList(FeedClient.OperationType.PUT, FeedClient.OperationType.UPDATE, FeedClient.OperationType.REMOVE), config.retryStrategyOperationsTypes);
+    }
+
+    @Test
+    void overridesRetryStrategy() {
+        params.put("vespa.retry.strategy.retries", "20");
+        params.put("vespa.retry.strategy.operation.types", "UPDATE,REMOVE");
+
+        VespaSinkConfig config = new VespaSinkConfig(params);
+
+        assertEquals(20, config.retryStrategyRetries);
+        assertIterableEquals(Arrays.asList(FeedClient.OperationType.UPDATE, FeedClient.OperationType.REMOVE), config.retryStrategyOperationsTypes);
+    }
+}