diff --git a/sample/files.f b/sample/files.f
deleted file mode 100644
index fabaac2..0000000
--- a/sample/files.f
+++ /dev/null
@@ -1,7 +0,0 @@
-sample/file1.sv
-sample/file2.sv
-sample/file3.sv
-sample/file4.sv
-+incdir+sample/
-// Some comment
-+define+a=b+c=d+e=f
\ No newline at end of file
diff --git a/sample/file1.sv b/testcase/file1.sv
similarity index 100%
rename from sample/file1.sv
rename to testcase/file1.sv
diff --git a/sample/file2.sv b/testcase/file2.sv
similarity index 100%
rename from sample/file2.sv
rename to testcase/file2.sv
diff --git a/sample/file3.sv b/testcase/file3.sv
similarity index 100%
rename from sample/file3.sv
rename to testcase/file3.sv
diff --git a/testcase/files.f b/testcase/files.f
new file mode 100644
index 0000000..8d89f83
--- /dev/null
+++ b/testcase/files.f
@@ -0,0 +1,7 @@
+testcase/file1.sv
+testcase/file2.sv
+testcase/file3.sv
++incdir+testcase/
+// Some comment
++define+a=b+c=d+e=f
+-f testcase/files2.f
\ No newline at end of file
diff --git a/testcase/files2.f b/testcase/files2.f
new file mode 100644
index 0000000..023b0b7
--- /dev/null
+++ b/testcase/files2.f
@@ -0,0 +1,2 @@
+testcase/file4.sv
++define+a=bad
\ No newline at end of file