Not sure why tests are failing, does this fix it?

Author: nedtwigg

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/SpotlessExtension.java

@@ -321,7 +321,7 @@ public Object doCall(TaskExecutionGraph graph) {
 					System.err.println("Argument passed to " + IDE_HOOK_PROPERTY + " must be an absolute path");
 					return;
 				}
-				if (spotlessTask.getTarget().contains(file)) {
+				if (spotlessTask.getTargetAsFileCollection().contains(file)) {
 					try (Formatter formatter = spotlessTask.buildFormatter()) {
 						PaddedCell.DirtyState dirty = PaddedCell.calculateDirtyState(formatter, file);
 						if (dirty.isClean()) {

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/SpotlessTask.java

@@ -105,19 +105,24 @@ public FormatExceptionPolicy getExceptionPolicy() {
 		return exceptionPolicy;
 	}
 
-	protected FileCollection target;
+	@Internal
+	FileCollection getTargetAsFileCollection() {
+		if (target instanceof FileCollection) {
+			return (FileCollection) target;
+		} else {
+			return getProject().files(target);
+		}
+	}
+
+	protected Iterable<File> target;
 
 	@Internal
-	public FileCollection getTarget() {
+	public Iterable<File> getTarget() {
 		return target;
 	}
 
 	public void setTarget(Iterable<File> target) {
-		if (target instanceof FileCollection) {
-			this.target = (FileCollection) target;
-		} else {
-			this.target = getProject().files(target);
-		}
+		this.target = target;
 	}
 
 	/** Internal use only. */