more assertions in common, ensure tests run with assertions

Makefile

@@ -26,11 +26,11 @@ all:
 
 .PHONY: test
 test:
-	./node_modules/.bin/tape test/unit/*.test.js
+	NODE_NDEBUG= ./node_modules/.bin/tape test/unit/*.test.js
 
 .PHONY: test-integration
 test-integration:
-	./node_modules/.bin/tape test/integration/*.test.js
+	NODE_NDEBUG= ./node_modules/.bin/tape test/integration/*.test.js
 
 .PHONY: git-hooks
 git-hooks:

lib/common.js

@@ -47,6 +47,9 @@ var TABULA_OPTIONS = [
 // ---- support stuff
 
 function objCopy(obj, target) {
+    assert.object(obj, 'obj');
+    assert.optionalObject(obj, 'target');
+
     if (target === undefined) {
         target = {};
     }
@@ -64,6 +67,9 @@ function deepObjCopy(obj) {
 
 function zeroPad(n, width) {
     var s = String(n);
+    assert.number(width, 'width');
+    assert.string(s, 'string');
+
     while (s.length < width) {
         s = '0' + s;
     }
@@ -117,8 +123,8 @@ function jsonStream(arr, stream) {
  * @param {Array} valid (optional) - an array to validate pairs
  */
 function kvToObj(kvs, valid) {
-    assert.arrayOfString(kvs);
+    assert.arrayOfString(kvs, 'kvs');
-    assert.optionalArrayOfString(valid);
+    assert.optionalArrayOfString(valid, 'valid');
 
     var o = {};
     for (var i = 0; i < kvs.length; i++) {
@@ -148,6 +154,8 @@ function kvToObj(kvs, valid) {
  */
 function longAgo(when, now) {
     now = now || new Date();
+    assert.date(now, 'now');
+
     var seconds = Math.round((now - when) / 1000);
     var times = [
         seconds / 60 / 60 / 24 / 365, // years
@@ -172,6 +180,7 @@ function longAgo(when, now) {
  * is a UUID or not
  */
 function isUUID(s) {
+    assert.string(s, 's');
     return /^([a-f\d]{8}(-[a-f\d]{4}){3}-[a-f\d]{12}?)$/i.test(s);
 }
 
@@ -276,6 +285,7 @@ function humanSizeFromBytes(opts, bytes) {
 }
 
 function capitalize(s) {
+    assert.string(s, 's');
     return s[0].toUpperCase() + s.substr(1);
 }
 
@@ -290,6 +300,8 @@ function capitalize(s) {
  * - support docker ID *longer* than a UUID? The curr implementation does.
  */
 function normShortId(s) {
+    assert.string(s, 's');
+
     var shortIdCharsRe = /^[a-f0-9]+$/;
     var shortId;
     if (s.indexOf('-') === -1) {