Add deserialisation test for VersionsCache Value

Author: emdash-ie

modules/core/src/test/resources/versions-cache-value-without-first-seen.json

@@ -0,0 +1,5 @@
+{
+    "updatedAt": 1000,
+    "versions": ["1.0.0", "1.0.1"],
+    "maybeError": null
+}

modules/core/src/test/scala/org/scalasteward/core/coursier/VersionsCacheTest.scala

@@ -0,0 +1,17 @@
+package org.scalasteward.core.coursier
+
+import io.circe.parser
+import munit.FunSuite
+import org.scalasteward.core.coursier.VersionsCache.Value
+import org.scalasteward.core.data.Version
+import org.scalasteward.core.util.Timestamp
+
+import scala.io.Source
+
+class VersionsCacheTest extends FunSuite {
+  test("version cache deserialisation without first seen") {
+    val input = Source.fromResource("versions-cache-value-without-first-seen.json").mkString
+    val expected = Value(Timestamp(1000), List(Version("1.0.0"), Version("1.0.1")), None)
+    assertEquals(parser.decode[Value](input), Right(expected))
+  }
+}