milestone 21: abp list exceptions and a regex rule kind

src/cli.zig

@@ -1527,7 +1527,16 @@ test "bare check with no config database exits 2 and says how to make one" {
     try testing.expect(std.mem.containsAtLeast(u8, text, 1, "no config database at "));
     try testing.expect(std.mem.containsAtLeast(u8, text, 1, config_db_name));
     try testing.expect(std.mem.containsAtLeast(u8, text, 1, db_source_hint));
-    try testing.expectEqual(@as(usize, 0), std.mem.count(u8, text, "OK"));
+    // Not a bare count of "OK" over the whole text: this message embeds the
+    // temporary directory path, and `std.testing.tmpDir` names that directory
+    // with base64 over random bytes, so a run whose name happens to carry those
+    // two letters would fail a test that has nothing to do with naming. Every
+    // verdict this command prints — `OK:` and `OK upstreams[...]` alike — opens
+    // a line, so that is what to assert on.
+    var lines = std.mem.splitScalar(u8, text, '\n');
+    while (lines.next()) |line| {
+        try testing.expect(!std.mem.startsWith(u8, line, "OK"));
+    }
     try testing.expectEqualStrings("", captured.err.written());
 }