diff --git a/complex/add.mjs b/complex/add.mjs
index f43c883..9cefa0a 100644
--- a/complex/add.mjs
+++ b/complex/add.mjs
@@ -1,4 +1,4 @@
-import {numComplex} from './Complex.mjs'
+import {numComplex} from './types/Complex.mjs'
 
 export const add = {
    '...Complex': [['self'], ref => addends => {
diff --git a/complex/complex.mjs b/complex/complex.mjs
index c8941fc..9d7f0c5 100644
--- a/complex/complex.mjs
+++ b/complex/complex.mjs
@@ -1,4 +1,4 @@
-import './Complex.mjs'
+import './types/Complex.mjs'
 
 export const complex = {
    /* Very permissive for sake of proof-of-concept; would be better to
diff --git a/complex/extendToComplex.mjs b/complex/extendToComplex.mjs
index 65817a2..64f4736 100644
--- a/complex/extendToComplex.mjs
+++ b/complex/extendToComplex.mjs
@@ -1,4 +1,4 @@
-import './Complex.mjs'
+import './types/Complex.mjs'
 import * as complex from './complex.mjs'
 
 /* Add all the complex implementations for functions already
diff --git a/complex/negate.mjs b/complex/negate.mjs
index ccf72a7..77dfb01 100644
--- a/complex/negate.mjs
+++ b/complex/negate.mjs
@@ -1,4 +1,4 @@
-import {numComplex} from './Complex.mjs'
+import {numComplex} from './types/Complex.mjs'
 export const negate = {
    Complex: [['self'], ref => z => {
       /* need a "base case" to avoid infinite self-reference */
diff --git a/complex/Complex.mjs b/complex/types/Complex.mjs
similarity index 100%
rename from complex/Complex.mjs
rename to complex/types/Complex.mjs
diff --git a/package.json5 b/package.json5
index 517eefb..6c804ce 100644
--- a/package.json5
+++ b/package.json5
@@ -5,7 +5,7 @@
     inclusion, avoiding factory functions.',
   main: 'index.js',
   scripts: {
-    test: 'npx mocha',
+    test: '!(find . | sort -f | uniq -i -c | grep -v " 1 ") && npx mocha',
   },
   repository: {
     type: 'git',