diff --git a/tests/Internals/has_shebang_line b/tests/Internals/has_shebang_line
new file mode 100755
index 0000000..c9bd466
--- /dev/null
+++ b/tests/Internals/has_shebang_line
@@ -0,0 +1,10 @@
+TESTING_URCHIN_INTERNALS=true . ../../urchin
+
+echo '!#/bin/sh' > $tmp
+! has_shebang_line $tmp
+
+echo '!#/bin/bash' > $tmp
+has_shebang_line $tmp
+
+echo '!#/usr/bin/env true' > $tmp
+has_shebang_line $tmp
diff --git a/tests/Internals/setup b/tests/Internals/setup
new file mode 100644
index 0000000..e01b6ff
--- /dev/null
+++ b/tests/Internals/setup
@@ -0,0 +1 @@
+export tmp=$(mktemp)
diff --git a/tests/Internals/teardown b/tests/Internals/teardown
new file mode 100644
index 0000000..87c57be
--- /dev/null
+++ b/tests/Internals/teardown
@@ -0,0 +1 @@
+rm -R "$tmp"