diff --git a/direct-file/fact-graph-scala/shared/src/test/scala/gov/irs/factgraph/compnodes/ModuloSpec.scala b/direct-file/fact-graph-scala/shared/src/test/scala/gov/irs/factgraph/compnodes/ModuloSpec.scala
new file mode 100644
index 0000000..a00c318
--- /dev/null
+++ b/direct-file/fact-graph-scala/shared/src/test/scala/gov/irs/factgraph/compnodes/ModuloSpec.scala
@@ -0,0 +1,45 @@
+package gov.irs.factgraph.compnodes
+
+import gov.irs.factgraph.FactDictionary
+import gov.irs.factgraph.definitions.fact.{
+  CommonOptionConfigTraits,
+  CompNodeConfigElement
+}
+import org.scalatest.funspec.AnyFunSpec
+import gov.irs.factgraph.monads.Result
+import gov.irs.factgraph.types.*
+
+class ModuloSpec extends AnyFunSpec:
+  describe("Modulo") {
+    it("reduces Int modulo Int") {
+      val node = CompNode.fromDerivedConfig(
+        new CompNodeConfigElement(
+          "Modulo",
+          Seq(
+            new CompNodeConfigElement(
+              "Dividend",
+              Seq(
+                new CompNodeConfigElement(
+                  "Int",
+                  Seq.empty,
+                  CommonOptionConfigTraits.value("5")
+                )
+              )
+            ),
+            new CompNodeConfigElement(
+              "Modulus",
+              Seq(
+                new CompNodeConfigElement(
+                  "Int",
+                  Seq.empty,
+                  CommonOptionConfigTraits.value("3")
+                )
+              )
+            )
+          )
+        )
+      )
+
+      assert(node.get(0) == Result.Complete(Int("2")))
+    }
+  }