diff --git a/backend/python/fish-speech/Makefile b/backend/python/fish-speech/Makefile
index a4033f105..53721204e 100644
--- a/backend/python/fish-speech/Makefile
+++ b/backend/python/fish-speech/Makefile
@@ -1,10 +1,13 @@
-.PHONY: fish-speech test-source-preparation
-fish-speech: test-source-preparation
+.PHONY: fish-speech test-source-preparation test-runtime-import
+fish-speech: test-source-preparation test-runtime-import
 	bash install.sh
 
 test-source-preparation:
 	bash prepare-source_test.sh
 
+test-runtime-import:
+	bash run_test.sh
+
 .PHONY: run
 run: fish-speech
 	@echo "Running fish-speech..."
diff --git a/backend/python/fish-speech/run.sh b/backend/python/fish-speech/run.sh
index db6656e18..58960297e 100644
--- a/backend/python/fish-speech/run.sh
+++ b/backend/python/fish-speech/run.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-backend_dir=$(dirname $0)
+backend_dir=$(dirname "$(realpath "$0")")
 if [ -d $backend_dir/common ]; then
     source $backend_dir/common/libbackend.sh
 else
@@ -8,7 +8,7 @@ fi
 
 # Editable installs record their build-time absolute source path, which becomes
 # stale when the backend is relocated under /backends at install time.
-export PYTHONPATH="${EDIR}/fish-speech-src${PYTHONPATH:+:${PYTHONPATH}}"
+export PYTHONPATH="${backend_dir}/fish-speech-src${PYTHONPATH:+:${PYTHONPATH}}"
 
 cuda_home=${CUDA_HOME:-/usr/local/cuda}
 if [ -z "${TRITON_PTXAS_PATH:-}" ] && [ -x "$cuda_home/bin/ptxas" ]; then
diff --git a/backend/python/fish-speech/run_test.sh b/backend/python/fish-speech/run_test.sh
index 65affb91f..bd45f0635 100644
--- a/backend/python/fish-speech/run_test.sh
+++ b/backend/python/fish-speech/run_test.sh
@@ -1,27 +1,23 @@
 #!/bin/bash
-# SPDX-License-Identifier: MIT
 set -euo pipefail
 
-backend_dir=$(cd "$(dirname "$0")" && pwd)
-work=$(mktemp -d)
-trap 'rm -rf "$work"' EXIT
+SCRIPT_DIR=$(dirname "$(realpath "$0")")
+WORK_DIR=$(mktemp -d)
+trap 'rm -rf "$WORK_DIR"' EXIT
 
-mkdir -p "$work/backend/common" "$work/backend/fish-speech-src"
-cp "$backend_dir/run.sh" "$work/backend/run.sh"
+mkdir -p "$WORK_DIR/runtime/common" "$WORK_DIR/runtime/fish-speech-src/fish_speech"
+cp "$SCRIPT_DIR/run.sh" "$WORK_DIR/runtime/run.sh"
 
-cat > "$work/backend/common/libbackend.sh" <<'EOF'
-EDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+cat > "$WORK_DIR/runtime/fish-speech-src/fish_speech/inference_engine.py" <<'PY'
+IMPORT_OK = True
+PY
+
+cat > "$WORK_DIR/runtime/common/libbackend.sh" <<'SH'
 startBackend() {
-    printf '%s\n' "$PYTHONPATH"
+    python3 -c 'from fish_speech.inference_engine import IMPORT_OK; assert IMPORT_OK'
 }
-EOF
+SH
 
-actual=$(PYTHONPATH=/existing/path bash "$work/backend/run.sh")
-expected="$work/backend/fish-speech-src:/existing/path"
+bash "$WORK_DIR/runtime/run.sh"
 
-if [ "$actual" != "$expected" ]; then
-    printf 'expected PYTHONPATH %s, got %s\n' "$expected" "$actual" >&2
-    exit 1
-fi
-
-echo "PASS: relocated fish-speech source is importable"
+echo "PASS: runtime launcher imports relocated fish-speech source"