Adding one more test

Author: cardil

src/test/java/pl/wavesoftware/lang/TriConsumerTest.java

@@ -0,0 +1,52 @@
+package pl.wavesoftware.lang;
+
+import org.junit.Test;
+
+import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+
+/**
+ * @author <a href="[email protected]">Krzysztof Suszyński</a>
+ * @since 2018-05-06
+ */
+public class TriConsumerTest {
+
+  private static final int HEX_RADIX = 16;
+
+  @Test
+  public void testAndThen() throws NoSuchAlgorithmException {
+    // given
+    StringBuilder sb = new StringBuilder();
+    TriConsumer<String, Boolean, Long> consumer = (string, aBoolean, aLong) -> {
+      sb.append("string => ").append(string).append(", ");
+      sb.append("bool => ").append(aBoolean).append(", ");
+      sb.append("long => ").append(aLong);
+    };
+    MessageDigest md = MessageDigest.getInstance("SHA-256");
+
+    // when
+    consumer
+      .andThen((s, aBool, aLong) -> {
+        md.update(s.getBytes(StandardCharsets.UTF_8));
+        md.update(aBool.toString().getBytes(StandardCharsets.UTF_8));
+        md.update(aLong.toString().getBytes(StandardCharsets.UTF_8));
+        sb.append(", digest => ")
+          .append(
+            new BigInteger(1, md.digest()).toString(HEX_RADIX)
+          );
+      })
+      .accept("Alice has a cat", true, 0L);
+
+    // then
+    assertThat(sb)
+      .isEqualToIgnoringNewLines(
+        "string => Alice has a cat, bool => true, long => 0, digest => " +
+          "59283a245f0ef51936819eb4e80fb2f9528d4ddbd022badf45c56f1e8073e8aa"
+      );
+  }
+}