Examples of Quasar in Kotlin (#7045)

kotlin-quasar/src/test/kotlin/com/baeldung/quasar/DataflowTest.kt

@@ -0,0 +1,35 @@
+package com.baeldung.quasar
+
+import co.paralleluniverse.strands.dataflow.Val
+import co.paralleluniverse.strands.dataflow.Var
+import org.junit.Assert
+import org.junit.Test
+import java.util.concurrent.TimeUnit
+
+class DataflowTest {
+    @Test
+    fun testValVar() {
+        val a = Var<Int>()
+        val b = Val<Int>()
+
+        val c = Var<Int> { a.get() + b.get() }
+        val d = Var<Int> { a.get() * b.get() }
+
+        // (a*b) - (a+b)
+        val initialResult = Val<Int> { d.get() - c.get() }
+        val currentResult = Var<Int> { d.get() - c.get() }
+
+        a.set(2)
+        b.set(4)
+
+        Assert.assertEquals(2, initialResult.get())
+        Assert.assertEquals(2, currentResult.get())
+
+        a.set(3)
+
+        TimeUnit.SECONDS.sleep(1)
+
+        Assert.assertEquals(2, initialResult.get())
+        Assert.assertEquals(5, currentResult.get())
+    }
+}