diff --git a/tests/kernel-cases/booleans/cov-boundary-fill-crescent-inside-one-tool/expected.json b/tests/kernel-cases/booleans/cov-boundary-fill-crescent-inside-one-tool/expected.json
new file mode 100644
index 0000000000..5e1c184043
--- /dev/null
+++ b/tests/kernel-cases/booleans/cov-boundary-fill-crescent-inside-one-tool/expected.json
@@ -0,0 +1,21 @@
+{
+ "sources": [],
+ "what": "Boundary Fill of the cell inside one cylinder and outside the other: the crescent",
+ "source": "analytic",
+ "method": "A minus the lens: 1000 pi - 1228.370; faces: bottom, top, A's outer arc, B's inner arc = 4",
+ "body_count": 1,
+ "faces": 4,
+ "volume_mm3": 1913.222954981036,
+ "bbox": {
+  "min": [
+   -10,
+   -10,
+   0
+  ],
+  "max": [
+   10,
+   10,
+   10
+  ]
+ }
+}
diff --git a/tests/kernel-cases/booleans/cov-boundary-fill-crescent-inside-one-tool/recipe.json b/tests/kernel-cases/booleans/cov-boundary-fill-crescent-inside-one-tool/recipe.json
new file mode 100644
index 0000000000..d6256522fd
--- /dev/null
+++ b/tests/kernel-cases/booleans/cov-boundary-fill-crescent-inside-one-tool/recipe.json
@@ -0,0 +1,42 @@
+{
+ "commands": [
+  {
+   "command": "solid.cylinder",
+   "params": {
+    "radius": 10,
+    "height": 10,
+    "body_name": "A"
+   }
+  },
+  {
+   "command": "solid.cylinder",
+   "params": {
+    "radius": 10,
+    "height": 10,
+    "base": [
+     10,
+     0,
+     0
+    ],
+    "body_name": "B"
+   }
+  },
+  {
+   "command": "solid.boundary_fill",
+   "params": {
+    "tools": [
+     "A",
+     "B"
+    ],
+    "cells": [
+     [
+      -5,
+      0,
+      5
+     ]
+    ],
+    "remove_tools": true
+   }
+  }
+ ]
+}
diff --git a/tests/kernel-cases/booleans/cov-boundary-fill-lens-of-two-cylinders/expected.json b/tests/kernel-cases/booleans/cov-boundary-fill-lens-of-two-cylinders/expected.json
new file mode 100644
index 0000000000..235cf5d6b7
--- /dev/null
+++ b/tests/kernel-cases/booleans/cov-boundary-fill-lens-of-two-cylinders/expected.json
@@ -0,0 +1,21 @@
+{
+ "sources": [],
+ "what": "Boundary Fill of the cell inside both of two overlapping cylinders (r10, axes 10 apart): the lens",
+ "source": "analytic",
+ "method": "two circles r with centres d = r apart overlap in 2r^2 acos(d/2r) - (d/2) sqrt(4r^2-d^2) = 200 pi/3 - 5 sqrt 300 = 122.837; h 10. Faces: bottom, top, two cylinder arcs = 4",
+ "body_count": 1,
+ "faces": 4,
+ "volume_mm3": 1228.3696986087568,
+ "bbox": {
+  "min": [
+   0,
+   -8.660254037844387,
+   0
+  ],
+  "max": [
+   10,
+   8.660254037844387,
+   10
+  ]
+ }
+}
diff --git a/tests/kernel-cases/booleans/cov-boundary-fill-lens-of-two-cylinders/recipe.json b/tests/kernel-cases/booleans/cov-boundary-fill-lens-of-two-cylinders/recipe.json
new file mode 100644
index 0000000000..0309db09cd
--- /dev/null
+++ b/tests/kernel-cases/booleans/cov-boundary-fill-lens-of-two-cylinders/recipe.json
@@ -0,0 +1,42 @@
+{
+ "commands": [
+  {
+   "command": "solid.cylinder",
+   "params": {
+    "radius": 10,
+    "height": 10,
+    "body_name": "A"
+   }
+  },
+  {
+   "command": "solid.cylinder",
+   "params": {
+    "radius": 10,
+    "height": 10,
+    "base": [
+     10,
+     0,
+     0
+    ],
+    "body_name": "B"
+   }
+  },
+  {
+   "command": "solid.boundary_fill",
+   "params": {
+    "tools": [
+     "A",
+     "B"
+    ],
+    "cells": [
+     [
+      5,
+      0,
+      5
+     ]
+    ],
+    "remove_tools": true
+   }
+  }
+ ]
+}
diff --git a/tests/kernel-cases/booleans/cov-boundary-fill-point-outside-every-tool-refused/expected.json b/tests/kernel-cases/booleans/cov-boundary-fill-point-outside-every-tool-refused/expected.json
new file mode 100644
index 0000000000..344fe9ebd6
--- /dev/null
+++ b/tests/kernel-cases/booleans/cov-boundary-fill-point-outside-every-tool-refused/expected.json
@@ -0,0 +1,8 @@
+{
+ "sources": [],
+ "what": "a cell point outside every tool encloses nothing: refused",
+ "source": "analytic",
+ "method": "(50,50,5) is in neither cylinder: no cell there, a clean refusal",
+ "outcome": "refused",
+ "refusal": "outside every tool"
+}
diff --git a/tests/kernel-cases/booleans/cov-boundary-fill-point-outside-every-tool-refused/recipe.json b/tests/kernel-cases/booleans/cov-boundary-fill-point-outside-every-tool-refused/recipe.json
new file mode 100644
index 0000000000..400ceaf397
--- /dev/null
+++ b/tests/kernel-cases/booleans/cov-boundary-fill-point-outside-every-tool-refused/recipe.json
@@ -0,0 +1,41 @@
+{
+ "commands": [
+  {
+   "command": "solid.cylinder",
+   "params": {
+    "radius": 10,
+    "height": 10,
+    "body_name": "A"
+   }
+  },
+  {
+   "command": "solid.cylinder",
+   "params": {
+    "radius": 10,
+    "height": 10,
+    "base": [
+     10,
+     0,
+     0
+    ],
+    "body_name": "B"
+   }
+  },
+  {
+   "command": "solid.boundary_fill",
+   "params": {
+    "tools": [
+     "A",
+     "B"
+    ],
+    "cells": [
+     [
+      50,
+      50,
+      5
+     ]
+    ]
+   }
+  }
+ ]
+}