diff --git a/build.gradle b/build.gradle
index caf30c7..f90a35e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -221,7 +221,7 @@ publishing {
 task writeActionsTestMatrix() {
 	doLast {
 		def testMatrix = []
-		file('src/test/groovy/net/fabricmc/loom/test/intergration').eachFile {
+		file('src/test/groovy/net/fabricmc/loom/test/integration').eachFile {
 			if (it.name.endsWith("Test.groovy")) {
 				if (it.name.endsWith("ReproducibleBuildTest.groovy")) {
 					// This test gets a special case to run across all os's
@@ -229,7 +229,7 @@ task writeActionsTestMatrix() {
 				}
 
 				def className = it.name.replace(".groovy", "")
-				testMatrix.add("net.fabricmc.loom.test.intergration.${className}")
+				testMatrix.add("net.fabricmc.loom.test.integration.${className}")
 			}
 		}
 
diff --git a/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java b/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java
index 6552089..45d114e 100644
--- a/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java
+++ b/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java
@@ -97,6 +97,7 @@ public final class CompileConfiguration {
 		extendsFrom(JavaPlugin.IMPLEMENTATION_CONFIGURATION_NAME, Constants.Configurations.MAPPINGS_FINAL, project);
 
 		extendsFrom(JavaPlugin.RUNTIME_CLASSPATH_CONFIGURATION_NAME, Constants.Configurations.LOOM_DEVELOPMENT_DEPENDENCIES, project);
+		extendsFrom(JavaPlugin.TEST_RUNTIME_CLASSPATH_CONFIGURATION_NAME, Constants.Configurations.LOOM_DEVELOPMENT_DEPENDENCIES, project);
 	}
 
 	public static void configureCompile(Project p) {
diff --git a/src/main/java/net/fabricmc/loom/util/Constants.java b/src/main/java/net/fabricmc/loom/util/Constants.java
index eb6576a..544ff8e 100644
--- a/src/main/java/net/fabricmc/loom/util/Constants.java
+++ b/src/main/java/net/fabricmc/loom/util/Constants.java
@@ -89,7 +89,7 @@ public class Constants {
 		 * Constants for versions of dependencies.
 		 */
 		public static final class Versions {
-			public static final String MIXIN_COMPILE_EXTENSIONS = "0.4.0";
+			public static final String MIXIN_COMPILE_EXTENSIONS = "0.4.1";
 			public static final String DEV_LAUNCH_INJECTOR = "0.2.1+build.8";
 			public static final String TERMINAL_CONSOLE_APPENDER = "1.2.0";
 			public static final String JETBRAINS_ANNOTATIONS = "19.0.0";
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/AccessWidenerTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/AccessWidenerTest.groovy
similarity index 97%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/AccessWidenerTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/AccessWidenerTest.groovy
index 0cde47a..6b15f47 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/AccessWidenerTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/AccessWidenerTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ArchiveAssertionsTrait
 import net.fabricmc.loom.test.util.ProjectTestTrait
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/DecompileTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy
similarity index 97%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/DecompileTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy
index fdab32c..b812ff2 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/DecompileTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
 import spock.lang.Specification
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/KotlinTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/KotlinTest.groovy
similarity index 97%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/KotlinTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/KotlinTest.groovy
index 6d738a6..3f30adf 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/KotlinTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/KotlinTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
 import spock.lang.IgnoreIf
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/LegacyProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/LegacyProjectTest.groovy
similarity index 97%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/LegacyProjectTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/LegacyProjectTest.groovy
index da40281..3818809 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/LegacyProjectTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/LegacyProjectTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
 import spock.lang.Specification
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/MavenProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/MavenProjectTest.groovy
similarity index 98%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/MavenProjectTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/MavenProjectTest.groovy
index 6358b7e..ba6ffd7 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/MavenProjectTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/MavenProjectTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ArchiveAssertionsTrait
 import net.fabricmc.loom.test.util.MockMavenServerTrait
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/MojangMappingsProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/MojangMappingsProjectTest.groovy
similarity index 97%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/MojangMappingsProjectTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/MojangMappingsProjectTest.groovy
index a98fb85..f5d03c7 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/MojangMappingsProjectTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/MojangMappingsProjectTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
 import spock.lang.Specification
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/MultiProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/MultiProjectTest.groovy
similarity index 98%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/MultiProjectTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/MultiProjectTest.groovy
index 05317dc..68d6a59 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/MultiProjectTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/MultiProjectTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ArchiveAssertionsTrait
 import net.fabricmc.loom.test.util.ProjectTestTrait
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/ReproducibleBuildTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/ReproducibleBuildTest.groovy
similarity index 98%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/ReproducibleBuildTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/ReproducibleBuildTest.groovy
index ef9a914..1860450 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/ReproducibleBuildTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/ReproducibleBuildTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import com.google.common.hash.HashCode
 import com.google.common.hash.Hashing
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/RunConfigTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/RunConfigTest.groovy
similarity index 97%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/RunConfigTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/RunConfigTest.groovy
index 6ffb113..acd6880 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/RunConfigTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/RunConfigTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
 import spock.lang.Specification
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/SimpleProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/SimpleProjectTest.groovy
similarity index 97%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/SimpleProjectTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/SimpleProjectTest.groovy
index 8be2504..e300bd3 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/SimpleProjectTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/SimpleProjectTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
 import spock.lang.Specification
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/UnpickTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/UnpickTest.groovy
similarity index 98%
rename from src/test/groovy/net/fabricmc/loom/test/intergration/UnpickTest.groovy
rename to src/test/groovy/net/fabricmc/loom/test/integration/UnpickTest.groovy
index da1de2d..2be479e 100644
--- a/src/test/groovy/net/fabricmc/loom/test/intergration/UnpickTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/UnpickTest.groovy
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package net.fabricmc.loom.test.intergration
+package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
 import org.zeroturnaround.zip.ZipUtil