Tweak tests

src/test/groovy/net/fabricmc/loom/BuildUtils.groovy

@@ -3,7 +3,7 @@ package net.fabricmc.loom
 /**
  * Created by Mitchell Skaggs on 6/12/2019.
  */
-static String genBuildFile() {
+static String genBuildFile(String mappingsDep = "\"net.fabricmc:yarn:\${project.yarn_mappings}\"") {
 	"""
 plugins {
 	id 'fabric-loom'
@@ -23,7 +23,7 @@ minecraft {
 dependencies {
 	//to change the versions see the gradle.properties file
 	minecraft "com.mojang:minecraft:\${project.minecraft_version}"
-	mappings "net.fabricmc:yarn:\${project.yarn_mappings}"
+	mappings ${mappingsDep}
 	modCompile "net.fabricmc:fabric-loader:\${project.loader_version}"
 
 	// Fabric API. This is technically optional, but you probably want it anyway.

src/test/groovy/net/fabricmc/loom/EmptyBuildFunctionalTest.groovy

@@ -46,7 +46,6 @@ class EmptyBuildFunctionalTest extends Specification {
 		where:
 		mcVersion | yarnVersion       		| loaderVersion     | fabricVersion
 		'1.14'    | '1.14+build.21'   		| '0.4.8+build.155' | '0.3.0+build.183'
-		'1.14.1'  | '1.14.1+build.10' | '0.4.8+build.155' | '0.3.0+build.183'
-		'1.14.2'  | '1.14.2+build.7'  | '0.4.8+build.155' | '0.3.0+build.183'
+		'1.16.2'  | '1.16.2+build.26:v2' 	| '0.9.2+build.206' | '0.19.0+build.398-1.16'
 	}
 }

src/test/groovy/net/fabricmc/loom/EmptyBuildMojangFunctionalTest.groovy

@@ -0,0 +1,50 @@
+package net.fabricmc.loom
+
+import org.gradle.testkit.runner.GradleRunner
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static net.fabricmc.loom.BuildUtils.*
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+/**
+ * Created by Mitchell Skaggs on 6/10/2019.
+ */
+class EmptyBuildMojangFunctionalTest extends Specification {
+	@Rule
+	TemporaryFolder testProjectDir = new TemporaryFolder()
+	File settingsFile
+	File buildFile
+	File propsFile
+
+	def setup() {
+		settingsFile = testProjectDir.newFile('settings.gradle')
+		buildFile = testProjectDir.newFile('build.gradle')
+		propsFile = testProjectDir.newFile('gradle.properties')
+	}
+
+	@Unroll
+	def "empty build succeeds using Minecraft #mcVersion"() {
+		given:
+		settingsFile << genSettingsFile("empty-build-functional-test")
+		propsFile << genPropsFile(mcVersion, "nope", loaderVersion, fabricVersion)
+		buildFile << genBuildFile("minecraft.officialMojangMappings()")
+
+		when:
+		def result = GradleRunner.create()
+				.withProjectDir(testProjectDir.root)
+				.withArguments('build',"--stacktrace")
+				.withPluginClasspath()
+				.forwardOutput()
+				.build()
+
+		then:
+		result.task(":build").outcome == SUCCESS
+
+		where:
+		mcVersion	| loaderVersion     | fabricVersion
+		'1.16.2'	| '0.9.2+build.206' | '0.19.0+build.398-1.16'
+	}
+}

src/test/groovy/net/fabricmc/loom/MixinBuildFunctionalTest.groovy

@@ -40,13 +40,7 @@ class MixinBuildFunctionalTest extends Specification {
 		modMixinsJavaFile = testProjectDir.newFile("src/main/java/net/fabricmc/example/mixin/ExampleMixin.java")
 	}
 
-	/**
-	 * Why it's ignored:
-	 * <p>
-	 * When doing mixin annotation processing, a {@link ServiceLoader} is used to find implementations of {@link org.spongepowered.tools.obfuscation.service.IObfuscationService}. The classpath isn't passed to the build properly in this case, causing the Fabric-specific {@link net.fabricmc.loom.mixin.ObfuscationServiceFabric} to not be loaded. This causes the mixin to fail to compile because it doesn't know how to be reobfuscated.
-	 */
 	@Unroll
-	@Ignore("fails because the annotation processor classpath doesn't include fabric-mixin-compile-extensions, so it doesn't know how to remap anything")
 	def "mixin build succeeds using Minecraft #mcVersion"() {
 		given:
 		settingsFile << genSettingsFile("mixin-build-functional-test")
@@ -71,7 +65,5 @@ class MixinBuildFunctionalTest extends Specification {
 		where:
 		mcVersion | yarnVersion       	| loaderVersion     | fabricVersion
 		'1.14'    | '1.14+build.21'   	| '0.4.8+build.155' | '0.3.0+build.184'
-		'1.14.1'  | '1.14.1+build.10' | '0.4.8+build.155' | '0.3.0+build.184'
-		'1.14.2'  | '1.14.2+build.7'  | '0.4.8+build.155' | '0.3.0+build.184'
 	}
 }

src/test/groovy/net/fabricmc/loom/SimpleBuildFunctionalTest.groovy

@@ -58,7 +58,5 @@ class SimpleBuildFunctionalTest extends Specification {
 		mcVersion | yarnVersion       | loaderVersion     | fabricVersion
 		'19w45a'  | '19w45a+build.2:v2'   | '0.6.2+build.166' | '0.4.9+build.258-1.15'
 		'1.14'    | '1.14+build.21'   | '0.4.8+build.155' | '0.3.0+build.184'
-		'1.14.1'  | '1.14.1+build.10' | '0.4.8+build.155' | '0.3.0+build.184'
-		'1.14.2'  | '1.14.2+build.7'  | '0.4.8+build.155' | '0.3.0+build.184'
 	}
 }