[sync] add test for s3client objecthead thunking

src/test/scala/net/kemitix/s3thorp/SyncSuite.scala

@@ -0,0 +1,22 @@
+package net.kemitix.s3thorp
+
+import java.time.Instant
+
+import cats.effect.IO
+import org.scalatest.FunSpec
+
+class SyncSuite extends FunSpec {
+
+  describe("s3client thunk") {
+    val hash = "hash"
+    val lastModified = Instant.now()
+    val sync = new Sync(new S3Client {
+      override def objectHead(bucket: String, key: String) = IO((hash, lastModified))
+    })
+    describe("objectHead") {
+      it("return the hash and lastModified expected") {
+        assertResult((hash, lastModified))(sync.objectHead("", "").unsafeRunSync())
+      }
+    }
+  }
+}