BAEL-2147 Add GsonTest

core-kotlin/src/test/kotlin/com/baeldung/kotlin/gson/GsonUnitTest.kt

@@ -0,0 +1,34 @@
+package com.baeldung.kotlin.gson
+
+import com.baeldung.datetime.UsePeriod
+import com.google.gson.Gson
+import com.google.gson.annotations.SerializedName
+import java.time.LocalDate
+import java.time.Period
+
+import org.junit.Assert
+import org.junit.Test
+
+class GsonUnitTest {
+
+    var gson = Gson()
+
+    @Test
+    fun givenObject_thenGetJSONString() {
+        var jsonString = gson.toJson(TestModel(1,"Test"))
+        Assert.assertEquals(jsonString, "{\"id\":1,\"description\":\"Test\"}")
+    }
+
+    @Test
+    fun givenJSONString_thenGetObject() {
+        var jsonString = "{\"id\":1,\"description\":\"Test\"}";
+        var testModel = gson.fromJson(jsonString, TestModel::class.java)
+        Assert.assertEquals(testModel.id, 1)
+        Assert.assertEquals(testModel.description, "Test")
+    }
+
+    data class TestModel(
+        val id: Int,
+        val description: String
+    )
+}