Add test for precompilation

t/Precomp/First.pm6

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+use lib 'lib', 'blib/lib';
+use Inline::Python;
+
+class Precomp::First { }

t/Precomp/Second.pm6

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+use lib 't';
+use Precomp::First;
+
+class Precomp::Second { }

t/precomp.t

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+#!/usr/bin/env perl6
+
+use v6;
+use Test;
+use Inline::Python;
+
+BEGIN {
+    %*ENV<PERL6LIB> = 'lib:blib/lib';
+}
+
+plan 2;
+
+my $ipc = CompUnit.new('lib/Inline/Python.pm6');
+my $already-precompiled = $ipc.precomp-path.IO.e;
+
+if not $already-precompiled {
+    $ipc.precomp;
+}
+
+my $first = CompUnit.new('t/Precomp/First.pm6');
+my $second = CompUnit.new('t/Precomp/Second.pm6');
+
+ok $first.precomp;
+ok $second.precomp;
+
+# clean up
+sub rmpp($cu) {
+    unlink($cu.precomp-path);
+}
+
+rmpp($first);
+rmpp($second);
+
+if not $already-precompiled {
+    rmpp($ipc);
+}
+
+# vim: ft=perl6