Add Eric's e2e test change to get more coverage

__tests__/create-cache-files.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# Validate args
+prefix="$1"
+if [ -z "$prefix" ]; then
+  echo "Must supply prefix argument"
+  exit 1
+fi
+
+mkdir test-cache
+echo "$prefix $GITHUB_RUN_ID" > test-cache/test-file.txt

__tests__/tar.test.ts

@@ -51,7 +51,7 @@ test("extract GNU tar", async () => {
 
         await tar.extractTar(archivePath, targetDirectory);
 
-        expect(execMock).toHaveBeenCalledTimes(2);
+        expect(execMock).toHaveBeenCalledTimes(1);
         expect(execMock).toHaveBeenLastCalledWith(`"tar"`, [
             "-xz",
             "-f",

__tests__/verify-cache-files.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# Validate args
+prefix="$1"
+if [ -z "$prefix" ]; then
+  echo "Must supply prefix argument"
+  exit 1
+fi
+
+# Sanity check GITHUB_RUN_ID defined
+if [ -z "$GITHUB_RUN_ID" ]; then
+  echo "GITHUB_RUN_ID not defined"
+  exit 1
+fi
+
+# Verify file exists
+file="test-cache/test-file.txt"
+echo "Checking for $file"
+if [ ! -e $file ]; then
+  echo "File does not exist"
+  exit 1
+fi
+
+# Verify file content
+content="$(cat $file)"
+echo "File content:\n$content"
+if [ -z "$(echo $content | grep --fixed-strings "$prefix $GITHUB_RUN_ID")" ]; then
+  echo "Unexpected file content"
+  exit 1
+fi