Test for build order.

src/test/kotlin/com/beust/kobalt/internal/BuildOrderTest.kt

@@ -0,0 +1,41 @@
+package com.beust.kobalt.internal
+
+import com.beust.kobalt.TestModule
+import com.beust.kobalt.api.Kobalt
+import com.beust.kobalt.project
+import org.testng.Assert
+import org.testng.annotations.BeforeClass
+import org.testng.annotations.DataProvider
+import org.testng.annotations.Guice
+import org.testng.annotations.Test
+import javax.inject.Inject
+
+@Guice(modules = arrayOf(TestModule::class))
+class BuildOrderTest @Inject constructor(val taskManager: TaskManager) {
+    @BeforeClass
+    fun beforeClass() {
+        Kobalt.init(TestModule())
+    }
+
+    @DataProvider
+    fun tasks(): Array<Array<out Any>> {
+        return arrayOf(
+            arrayOf(listOf("p1:assemble"), listOf("p1:assemble")),
+            arrayOf(listOf("p2:assemble"), listOf("p1:assemble", "p2:assemble")),
+            arrayOf(listOf("p3:assemble"), listOf("p1:assemble", "p2:assemble", "p3:assemble"))
+        )
+    }
+
+    @Test(dataProvider = "tasks")
+    fun shouldBuildInRightOrder(tasks: List<String>, expectedTasks: List<String>) {
+        val p1 = project { name = "p1" }
+        val p2 = project(p1) { name = "p2" }
+        val p3 = project(p2) { name = "p3" }
+
+        val allProjects = listOf(p1, p2, p3)
+        with(taskManager) {
+            val taskInfos = calculateDependentTaskNames(tasks, allProjects)
+            Assert.assertEquals(taskInfos.map { it.id }, expectedTasks)
+        }
+    }
+}