1 files changed, 18 insertions, 10 deletions

diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/testing/TestProcessRunner.java b/src/test/java/org/zwobble/hobgoblin/compiler/testing/TestProcessRunner.java
index 882519c..73117a1 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/testing/TestProcessRunner.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/testing/TestProcessRunner.java
@@ -43,34 +43,42 @@ public class TestProcessRunner {
     }
 
     private static class ThreadReader {
+        private static class ReadResult {
+            String output;
+            IOException exception;
+        }
+
         public static ThreadReader start(Reader reader) {
             var lock = new Object();
-            var output = new String[1];
+            var readResult = new ReadResult();
             Thread.startVirtualThread(() -> {
                 synchronized (lock) {
                     try (reader) {
-                        output[0] = reader.readAllAsString();
+                        readResult.output = reader.readAllAsString();
                     } catch (IOException exception) {
-                        // TODO: handle this more elegantly.
-                        throw new RuntimeException(exception);
+                        readResult.exception = exception;
                     }
                 }
             });
 
-            return new ThreadReader(lock, output);
+            return new ThreadReader(lock, readResult);
         }
 
         private final Object lock;
-        private final String[] output;
+        private final ReadResult readResult;
 
-        public ThreadReader(Object lock, String[] output) {
+        public ThreadReader(Object lock, ReadResult readResult) {
             this.lock = lock;
-            this.output = output;
+            this.readResult = readResult;
         }
 
-        public String waitForString() {
+        public String waitForString() throws IOException {
             synchronized (this.lock) {
-                return this.output[0];
+                if (this.readResult.exception != null) {
+                    throw this.readResult.exception;
+                } else {
+                    return this.readResult.output;
+                }
             }
         }
     }