Test access failure error handling in the VDP constructor.

src/tests/vdp.vtc

@@ -147,6 +147,28 @@ varnish v1 -errvcl {vdp pipe failure: new emptypath: path is empty} {
 	}
 }
 
+shell "touch ${tmpdir}/foo"
+
+varnish v1 -errvcl {vdp pipe failure: new noexec: cannot execute ${tmpdir}/foo: } {
+	import ${vmod_pipe};
+	backend b None;
+
+	sub vcl_init {
+		new noexec = pipe.vdp(path="${tmpdir}/foo");
+	}
+}
+
+shell "rm ${tmpdir}/foo"
+
+varnish v1 -errvcl {vdp pipe failure: new enoent: cannot execute ${tmpdir}/foo: } {
+	import ${vmod_pipe};
+	backend b None;
+
+	sub vcl_init {
+		new enoent = pipe.vdp(path="${tmpdir}/foo");
+	}
+}
+
 varnish v1 -vcl { backend b None; }
 
 # Tests the discard event, with removal of VDPs.