Added initial tests

Author: Stefterv

app/build.gradle.kts

@@ -1,5 +1,6 @@
 import org.gradle.kotlin.dsl.support.zipTo
 import org.gradle.nativeplatform.platform.internal.DefaultNativePlatform
+import org.jetbrains.compose.ExperimentalComposeLibrary
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat
 import org.jetbrains.compose.desktop.application.tasks.AbstractJPackageTask
 import org.jetbrains.compose.internal.de.undercouch.gradle.tasks.download.Download
@@ -121,6 +122,9 @@ dependencies {
     testImplementation(libs.mockitoKotlin)
     testImplementation(libs.junitJupiter)
     testImplementation(libs.junitJupiterParams)
+
+    @OptIn(ExperimentalComposeLibrary::class)
+    testImplementation(compose.uiTest)
 }
 
 tasks.test {

app/src/processing/app/Preferences.kt

@@ -32,6 +32,10 @@ class ReactiveProperties: Properties() {
     }
 
     operator fun get(key: String): String? = getProperty(key)
+
+    operator fun set(key: String, value: String) {
+        setProperty(key, value)
+    }
 }
 val LocalPreferences = compositionLocalOf<ReactiveProperties> { error("No preferences provided") }
 @OptIn(FlowPreview::class)
@@ -53,7 +57,7 @@ fun PreferencesProvider(content: @Composable () -> Unit){
     LaunchedEffect(properties) {
         snapshotFlow { properties._stateMap.toMap() }
             .dropWhile { it == initialState }
-            .debounce(1000)
+            .debounce(100)
             .collect {
                 preferencesFile.outputStream().use { output ->
                     output.write(

app/test/processing/app/PreferencesKtTest.kt

@@ -0,0 +1,34 @@
+package processing.app
+
+import androidx.compose.material.Button
+import androidx.compose.material.Text
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.test.*
+import kotlin.test.Test
+
+class PreferencesKtTest{
+    @OptIn(ExperimentalTestApi::class)
+    @Test
+    fun testKeyReactivity() = runComposeUiTest {
+        val newValue = (0..Int.MAX_VALUE).random().toString()
+        val testKey = "test.preferences.reactivity.$newValue"
+        setContent {
+            PreferencesProvider {
+                val preferences = LocalPreferences.current
+                Text(preferences[testKey] ?: "default", modifier = Modifier.testTag("text"))
+
+                Button(onClick = {
+                    preferences[testKey] = newValue
+                }, modifier = Modifier.testTag("button")) {
+                    Text("Change")
+                }
+            }
+        }
+
+        onNodeWithTag("text").assertTextEquals("default")
+        onNodeWithTag("button").performClick()
+        onNodeWithTag("text").assertTextEquals(newValue)
+    }
+
+}