diff --git a/fieldtests/fold-selector/fs_1_two_taps.ops.json b/fieldtests/fold-selector/fs_1_two_taps.ops.json
new file mode 100644
index 0000000..c72da54
--- /dev/null
+++ b/fieldtests/fold-selector/fs_1_two_taps.ops.json
@@ -0,0 +1,15 @@
+[
+  {"op": "source", "role": "price", "kind": "F64"},
+  {"op": "add", "type": "SMA", "name": "fast", "bind": {"length": {"I64": 3}}},
+  {"op": "add", "type": "SMA", "name": "slow", "bind": {"length": {"I64": 6}}},
+  {"op": "add", "type": "SMA", "name": "px", "bind": {"length": {"I64": 1}}},
+  {"op": "feed", "role": "price", "into": ["fast.series", "slow.series", "px.series"]},
+  {"op": "add", "type": "Sub", "name": "sub"},
+  {"op": "connect", "from": "fast.value", "to": "sub.lhs"},
+  {"op": "connect", "from": "slow.value", "to": "sub.rhs"},
+  {"op": "add", "type": "Bias", "name": "bias", "bind": {"scale": {"F64": 0.5}}},
+  {"op": "connect", "from": "sub.value", "to": "bias.signal"},
+  {"op": "tap", "from": "sub.value", "as": "signal"},
+  {"op": "tap", "from": "px.value", "as": "price"},
+  {"op": "expose", "from": "bias.bias", "as": "bias"}
+]
diff --git a/fieldtests/fold-selector/fs_2_bool_tap.ops.json b/fieldtests/fold-selector/fs_2_bool_tap.ops.json
new file mode 100644
index 0000000..c3dcb86
--- /dev/null
+++ b/fieldtests/fold-selector/fs_2_bool_tap.ops.json
@@ -0,0 +1,18 @@
+[
+  {"op": "source", "role": "price", "kind": "F64"},
+  {"op": "add", "type": "SMA", "name": "fast", "bind": {"length": {"I64": 3}}},
+  {"op": "add", "type": "SMA", "name": "slow", "bind": {"length": {"I64": 6}}},
+  {"op": "feed", "role": "price", "into": ["fast.series", "slow.series"]},
+  {"op": "add", "type": "Gt", "name": "cross"},
+  {"op": "connect", "from": "fast.value", "to": "cross.a"},
+  {"op": "connect", "from": "slow.value", "to": "cross.b"},
+  {"op": "add", "type": "Sign", "name": "sgn"},
+  {"op": "add", "type": "Sub", "name": "sub"},
+  {"op": "connect", "from": "fast.value", "to": "sub.lhs"},
+  {"op": "connect", "from": "slow.value", "to": "sub.rhs"},
+  {"op": "connect", "from": "sub.value", "to": "sgn.value"},
+  {"op": "add", "type": "Bias", "name": "bias", "bind": {"scale": {"F64": 1.0}}},
+  {"op": "connect", "from": "sgn.value", "to": "bias.signal"},
+  {"op": "tap", "from": "cross.value", "as": "above"},
+  {"op": "expose", "from": "bias.bias", "as": "bias"}
+]