Add basic JsonKeyValueStore test

Author: fthomas

modules/core/src/test/scala/org/scalasteward/core/util/JsonKeyValueStoreTest.scala

@@ -0,0 +1,31 @@
+package org.scalasteward.core.util
+
+import cats.implicits._
+import org.scalasteward.core.mock.MockContext._
+import org.scalasteward.core.mock.{MockEff, MockState}
+import org.scalatest.Matchers
+import org.scalatest.funsuite.AnyFunSuite
+
+class JsonKeyValueStoreTest extends AnyFunSuite with Matchers {
+  test("put, get, getOrElse") {
+    val kvStore = new JsonKeyValueStore[MockEff, String, String]("test", "0")
+    val p = kvStore.put("k1", "v1") >> (kvStore.get("k1"), kvStore.getOrElse("k2", "v2")).tupled
+    val (state, value) = p.run(MockState.empty).unsafeRunSync()
+
+    val file = config.workspace / "test_v0.json"
+    value shouldBe (Some("v1") -> "v2")
+    state shouldBe MockState.empty.copy(
+      commands = Vector(
+        List("read", file.toString),
+        List("write", file.toString),
+        List("read", file.toString),
+        List("read", file.toString)
+      ),
+      files = Map(
+        file -> """|{
+                   |  "k1" : "v1"
+                   |}""".stripMargin.trim
+      )
+    )
+  }
+}