From f705e997e865bb4fef4ea7e5e37e7f1e0781af6e Mon Sep 17 00:00:00 2001
From: modmuss50 <modmuss50@gmail.com>
Date: Mon, 20 Jun 2022 20:49:35 +0100
Subject: [PATCH] Add "fabric.loom.test.homeDir" system prob to re-use gradle
 home between test runs. Vastly speeds up unit tests.

---
 build.gradle                                               | 5 +++++
 .../fabricmc/loom/test/util/GradleProjectTestTrait.groovy  | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/build.gradle b/build.gradle
index b71ea7af..7c4e7e3b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -189,6 +189,11 @@ jacocoTestReport {
 test {
 	maxHeapSize = "1536m"
 	useJUnitPlatform()
+
+	// Forward system prop onto tests.
+	if (System.getProperty("fabric.loom.test.homeDir")) {
+		systemProperty "fabric.loom.test.homeDir", System.getProperty("fabric.loom.test.homeDir")
+	}
 }
 
 import org.gradle.util.GradleVersion
diff --git a/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy b/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
index 4dcecedd..f88e68cc 100644
--- a/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
@@ -46,6 +46,13 @@ trait GradleProjectTestTrait {
         File projectDir = options.projectDir as File ?: options.sharedFiles ? sharedProjectDir : File.createTempDir()
         File gradleHomeDir = options.gradleHomeDir as File ?: options.sharedFiles ? sharedGradleHomeDir : File.createTempDir()
 
+		// Useful for faster local testing.
+		def homeDirOverride = System.getProperty("fabric.loom.test.homeDir")
+
+		if (homeDirOverride) {
+			gradleHomeDir = new File(homeDirOverride);
+		}
+
         setupProject(options, projectDir)
 
         println([