Assert on error messages

Author: kevinsawicki

test/signcode-test.js

@@ -154,6 +154,7 @@ describe('signcode', function () {
       signcode.sign(options, function (error) {
         assert(error instanceof Error)
         assert(error.message.length > 0)
+        assert.notEqual(error.message.indexOf('Failed to read private key file'), -1)
         done()
       })
     })
@@ -173,6 +174,7 @@ describe('signcode', function () {
       signcode.sign(options, function (error) {
         assert(error instanceof Error)
         assert(error.message.length > 0)
+        assert.notEqual(error.message.indexOf('Failed to open password file'), -1)
         done()
       })
     })