Integrate "minifies to nothing" tests into t/minify.t

Author: bleargh45

t/03-minifies-to-nothing.t

@@ -279,5 +279,37 @@ let html  = `
   is $got, $expect;
 };
 
+###############################################################################
+# JS that minifies to "nothing"
+subtest 'minifies to nothing' => sub {
+  subtest 'block comment' => sub {
+    my $given  = '/* */';
+    my $expect = undef;
+    my $got    = minify($given);
+    is $got, $expect
+  };
+
+  subtest 'line comment' => sub {
+    my $given  = '// foo';
+    my $expect = undef;
+    my $got    = minify($given);
+    is $got, $expect
+  };
+
+  subtest 'just whitespace' => sub {
+    my $given  = "  \r\n \t ";
+    my $expect = undef;
+    my $got    = minify($given);
+    is $got, $expect
+  };
+
+  subtest 'empty string' => sub {
+    my $given  = '';
+    my $expect = undef;
+    my $got    = minify($given);
+    is $got, $expect
+  };
+};
+
 ###############################################################################
 done_testing();