app loads configuration from json at runtime

src/jvmTest/kotlin/ConfigTest.kt

@@ -0,0 +1,55 @@
+package org.example
+
+import kotlinx.serialization.json.Json
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+
+class ConfigTest {
+    
+    @Test
+    fun testConfigDeserialization() {
+        val jsonString = """
+        {
+          "osmData": {
+            "useLocalExtract": false,
+            "localFilePath": "virginia.osm.pbf",
+            "boundingBox": {
+              "south": 37.115,
+              "west": -76.396,
+              "north": 37.139,
+              "east": -76.345,
+              "description": "Poquoson, VA"
+            },
+            "overpassTimeout": 25
+          },
+          "projection": {
+            "origin": {
+              "latitude": 37.120907,
+              "longitude": -76.333694
+            }
+          },
+          "output": {
+            "fileName": "municipality.glb",
+            "autoOpen": true
+          }
+        }
+        """.trimIndent()
+        
+        val config = Json.decodeFromString<Config>(jsonString)
+        
+        assertNotNull(config)
+        assertEquals(false, config.osmData.useLocalExtract)
+        assertEquals("virginia.osm.pbf", config.osmData.localFilePath)
+        assertEquals(37.115, config.osmData.boundingBox.south)
+        assertEquals(-76.396, config.osmData.boundingBox.west)
+        assertEquals(37.139, config.osmData.boundingBox.north)
+        assertEquals(-76.345, config.osmData.boundingBox.east)
+        assertEquals("Poquoson, VA", config.osmData.boundingBox.description)
+        assertEquals(25, config.osmData.overpassTimeout)
+        assertEquals(37.120907, config.projection.origin.latitude)
+        assertEquals(-76.333694, config.projection.origin.longitude)
+        assertEquals("municipality.glb", config.output.fileName)
+        assertEquals(true, config.output.autoOpen)
+    }
+}