diff --git a/apstools/synApps/tests/test_2slit.py b/apstools/synApps/tests/test_2slit.py
new file mode 100644
index 000000000..8ad253e70
--- /dev/null
+++ b/apstools/synApps/tests/test_2slit.py
@@ -0,0 +1,68 @@
+from ..db_2slit import Optics2Slit1D
+from ..db_2slit import Optics2Slit2D_HV
+from ..db_2slit import Optics2Slit2D_InbOutBotTop
+from ...utils import SlitGeometry
+
+IOC = "gp:"
+
+# TODO: test "sync" signal
+
+
+def test_2slit1D():
+    axis = Optics2Slit1D("gp:Slit1H", name="axis")
+    assert axis is not None
+
+    axis.wait_for_connection()
+    assert axis.connected
+
+    cns = "xn xp size center sync".split()
+    assert axis.component_names == tuple(cns)
+
+
+def test_2slit2D_HV():
+    slit1 = Optics2Slit2D_HV("gp:Slit1", name="slit1")
+    assert slit1 is not None
+
+    slit1.wait_for_connection()
+    assert slit1.connected
+    assert slit1.component_names == ("h", "v")
+
+    slit1.h.size.move(0.1)
+    slit1.v.size.move(0.2)
+    slit1.h.center.move(0.)
+    slit1.v.center.move(0.)
+    g = slit1.geometry
+    assert isinstance(g, SlitGeometry)
+    assert g == SlitGeometry(0.1, 0.2, 0, 0)
+    assert round(slit1.h.xn.position, 4) == -0.05
+    assert round(slit1.h.xp.position, 4) == 0.05
+    assert round(slit1.v.xn.position, 4) == -0.1
+    assert round(slit1.v.xp.position, 4) == 0.1
+
+
+def test_2slit2D_InbOutBotTop():
+    slit1 = Optics2Slit2D_InbOutBotTop("gp:Slit1", name="slit1")
+    assert slit1 is not None
+
+    slit1.wait_for_connection()
+    assert slit1.connected
+
+    cns = """
+    inb out bot top
+    hsize hcenter
+    vsize vcenter
+    hsync vsync
+    """.split()
+    assert slit1.component_names != tuple(cns)
+
+    slit1.hsize.move(0.3)
+    slit1.vsize.move(0.4)
+    slit1.hcenter.move(0.)
+    slit1.vcenter.move(0.)
+    g = slit1.geometry
+    assert isinstance(g, SlitGeometry)
+    assert g == SlitGeometry(0.3, 0.4, 0, 0)
+    assert round(slit1.inb.position, 4) == -0.15
+    assert round(slit1.out.position, 4) == 0.15
+    assert round(slit1.bot.position, 4) == -0.2
+    assert round(slit1.top.position, 4) == 0.2