diff --git a/internal/processor/script-expr_test.go b/internal/processor/script-expr_test.go
new file mode 100644
index 0000000..a0c1e23
--- /dev/null
+++ b/internal/processor/script-expr_test.go
@@ -0,0 +1,58 @@
+package processor_test
+
+import (
+	"testing"
+
+	"github.com/expr-lang/expr"
+	"github.com/jwetzell/showbridge-go/internal/processor"
+)
+
+func TestGoodScriptExpr(t *testing.T) {
+	tests := []struct {
+		program  string
+		name     string
+		payload  map[string]any
+		expected any
+	}{
+		{
+			program: "foo + bar",
+			name:    "number",
+			payload: map[string]any{
+				"foo": 1,
+				"bar": 1,
+			},
+			expected: 2,
+		},
+		{
+			program: "foo + bar",
+			name:    "string",
+			payload: map[string]any{
+				"foo": "1",
+				"bar": "1",
+			},
+			expected: "11",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			program, err := expr.Compile(test.program)
+			if err != nil {
+				t.Errorf("script.expr failed to compile program: %s", err)
+			}
+
+			exprProcessor := &processor.ScriptExpr{Program: program}
+
+			got, err := exprProcessor.Process(t.Context(), test.payload)
+
+			if err != nil {
+				t.Errorf("script.expr failed: %s", err)
+			}
+
+			//TODO(jwetzell): work out better way to compare the any/any
+			if got != test.expected {
+				t.Errorf("script.expr got %+v (%T), expected %+v (%T)", got, got, test.expected, test.expected)
+			}
+		})
+	}
+}