Better variant support.

src/test/kotlin/com/beust/kobalt/VariantTest.kt

@@ -0,0 +1,43 @@
+package com.beust.kobalt
+
+import com.beust.kobalt.api.buildType
+import com.beust.kobalt.api.productFlavor
+import com.beust.kobalt.plugin.java.JavaProject
+import org.testng.Assert
+import org.testng.annotations.DataProvider
+import org.testng.annotations.Test
+import java.util.*
+
+class VariantTest : KobaltTest() {
+
+    @DataProvider(name = "projectVariants")
+    fun projectVariants() = arrayOf(
+            arrayOf(emptySet<String>(), JavaProject().apply {
+            }),
+            arrayOf(hashSetOf("compileDev"), JavaProject().apply {
+                productFlavor("dev") {}
+            }),
+            arrayOf(hashSetOf("compileDev", "compileProd"), JavaProject().apply {
+                productFlavor("dev") {}
+                productFlavor("prod") {}
+            }),
+            arrayOf(hashSetOf("compileDevDebug"), JavaProject().apply {
+                productFlavor("dev") {}
+                buildType("debug") {}
+            }),
+            arrayOf(hashSetOf("compileDevRelease", "compileDevDebug", "compileProdDebug", "compileProdRelease"),
+                    JavaProject().apply {
+                        productFlavor("dev") {}
+                        productFlavor("prod") {}
+                        buildType("debug") {}
+                        buildType("release") {}
+            })
+            )
+
+    @Test(dataProvider = "projectVariants", description =
+            "Make sure we generate the correct dynamic tasks based on the product flavor and build types.")
+    fun taskNamesShouldWork(expected: Set<String>, project: JavaProject) {
+        val variantNames = HashSet(Variant.allVariants(project).map { it.toTask("compile") })
+        Assert.assertEquals(variantNames, expected)
+    }
+}