import: make it work most of the time with git repos

This includes real tests too.

tests/source-files/org.tasks/build.gradle.kts

@@ -0,0 +1,26 @@
+buildscript {
+    repositories {
+        jcenter()
+        google()
+        maven("https://maven.fabric.io/public")
+    }
+
+    dependencies {
+        classpath("com.android.tools.build:gradle:3.6.0-rc01")
+        classpath("com.google.gms:google-services:4.3.3")
+        // https://docs.fabric.io/android/changelog.html#fabric-gradle-plugin
+        classpath("io.fabric.tools:gradle:1.31.2")
+        classpath("com.github.ben-manes:gradle-versions-plugin:0.27.0")
+        classpath("com.cookpad.android.licensetools:license-tools-plugin:1.7.0")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${Versions.kotlin}")
+    }
+}
+
+plugins {
+    id("com.github.ben-manes.versions") version "0.21.0"
+}
+
+tasks.getByName<Wrapper>("wrapper") {
+    gradleVersion = "5.6.4"
+    distributionType = Wrapper.DistributionType.ALL
+}