diff --git a/src/groovylight/geom.py b/src/groovylight/geom.py
index d658c7c..8646d4c 100644
--- a/src/groovylight/geom.py
+++ b/src/groovylight/geom.py
@@ -7,7 +7,7 @@ from typing import Self
 from math import ceil, log2
 
 
-@dataclass(frozen=True, order=True)
+@dataclass(frozen=True)
 class Coord:
     """Coordinate class. Uses computer-graphics standard coordinate system,
     where X=0, Y=0 is top left. +X goes right. +Y goes down.
@@ -20,6 +20,24 @@ class Coord:
         if self.x < 0 or self.y < 0:
             raise RuntimeError("x and y must both be >= 0")
 
+    def __lt__(self, other):
+        return self.x < other.x and self.y < other.y
+
+    def __gt__(self, other):
+        return self.x > other.x and self.y > other.y
+
+    def __eq__(self, other):
+        return self.x == other.x and self.y == other.y
+
+    def __neq__(self, other):
+        return not (self.x == other.x and self.y == other.y)
+
+    def __le__(self, other):
+        return self.x <= other.x and self.y <= other.y
+
+    def __ge__(self, other):
+        return self.x >= other.x and self.y >= other.y
+
 
 @dataclass(frozen=True)
 class BBox:
@@ -34,7 +52,7 @@ class BBox:
             raise RuntimeError("topleft must be strictly less than bottomright")
 
     def contains(self, c: Coord) -> bool:
-        return c > self.topleft and c < self.bottomright
+        return c >= self.topleft and c <= self.bottomright
 
     @property
     def width(self) -> int:
diff --git a/src/groovylight/test_hub75.py b/src/groovylight/test_hub75.py
deleted file mode 100644
index 79c3a18..0000000
--- a/src/groovylight/test_hub75.py
+++ /dev/null
@@ -1,38 +0,0 @@
-from amaranth import Array, Module, Cat, Signal, Assert, unsigned
-from amaranth.build import Platform
-from amaranth.lib import wiring, data
-from amaranth.lib.wiring import In, Out
-from amaranth.lib.memory import Memory, WritePort
-from amaranth.sim import Simulator
-
-from .bitslicer import Hub75StringDriver, Rgb666Layout
-
-
-def test_stringdriver():
-    # the string driver test must
-    # 1. finish
-    # 2. strobe through all of the data in the array
-    # 3. slice the correct bit from the data.
-    m = Module()
-    m.submodules.dut = dut = Hub75StringDriver()
-    m.submodules.mem = mem = Memory(
-        shape=data.ArrayLayout(Rgb666Layout, 2), depth=128, init=[]
-    )
-    port = mem.read_port()
-
-    wiring.connect(m, port, dut.bram_port)
-
-    async def testbench(ctx):
-        # select a bit, strobe start, read values, test against known.
-        ctx.set(dut.bcm_select, 5)
-        ctx.set(dut.start, 1)
-        await ctx.tick()
-        ctx.set(dut.start, 0)
-        assert ctx.get(dut.bram_port.en) == 1
-        pass
-
-    sim = Simulator(m)
-    sim.add_clock(1e-6)
-
-    with sim.write_vcd("output.vcd"):
-        sim.run_until(1e-6 * 1000)
diff --git a/src/groovylight/test_swapbuffer.py b/src/groovylight/test_swapbuffer.py
deleted file mode 100644
index 2b5cce2..0000000
--- a/src/groovylight/test_swapbuffer.py
+++ /dev/null
@@ -1,34 +0,0 @@
-from amaranth import Array, Module, Cat, Signal, Assert, unsigned
-from amaranth.build import Platform
-from amaranth.lib import wiring, data
-from amaranth.lib.wiring import In, Out
-from amaranth.lib.memory import Memory, WritePort
-from amaranth.sim import Simulator
-
-from .bitslicer import Hub75StringDriver, Rgb666Layout, SwapBuffer
-
-
-def test_swapbuffer():
-    dut = SwapBuffer(Rgb666Layout, 512)
-    sim = Simulator(dut)
-    sim.add_clock(1e-6)
-
-    async def testbench(ctx):
-        init_color = {"red": 0, "green": 0, "blue": 0}
-        test_color = {"red": 8, "green": 8, "blue": 8}
-        ctx.set(dut.selector, 0)
-        ctx.set(dut.write_port.addr, 1)
-        ctx.set(dut.read_port.addr, 1)
-        ctx.set(dut.write_port.data, test_color)
-        await ctx.tick()
-        # assert that the read port addr 1 = 0
-        assert ctx.get(dut.read_port.data) == init_color
-        # swap buffer
-        ctx.set(dut.selector, 1)
-        await ctx.tick().repeat(2) # takes two clocks after switching selector to output data.
-        assert ctx.get(dut.read_port.data) == test_color
-    
-    # TODO: add more assertions/verification
-    sim.add_testbench(testbench)
-    with sim.write_vcd("output.vcd"):
-        sim.run_until(1e-6 * 1000)
diff --git a/src/groovylight/tests/test_gamma.py b/src/groovylight/tests/test_gamma.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/groovylight/tests/test_geom.py b/src/groovylight/tests/test_geom.py
new file mode 100644
index 0000000..47b8a07
--- /dev/null
+++ b/src/groovylight/tests/test_geom.py
@@ -0,0 +1,32 @@
+from ..geom import Coord, BBox
+
+import pytest
+
+def test_coord_comparison():
+    c1 = Coord(0,0)
+    c2 = Coord(0,1)
+    c3 = Coord(1,1)
+    c3_other = Coord(1,1)
+
+    assert c1 < c3
+    assert not c1 < c2, "both x,y must be greater/lt/eq"
+    assert c2 <= c3
+
+    assert c3 == c3_other, "Coords with same numbers should equal each other"
+    assert c3 != c2
+
+def test_coord_construction():
+    with pytest.raises(RuntimeError):
+        Coord(0,-1)
+
+
+def test_bbox():
+    b = BBox(Coord(1,1), Coord(3,2))
+
+    assert b.width == 2
+    assert b.height == 1
+
+    assert b.contains(Coord(1,2))
+    assert not b.contains(Coord(0,0))
+    
+    # TODO: test .intersect(other)