Start checking arity on arg comparisons

lib/args-match.coffee

@@ -1,12 +1,24 @@
 _ = require('lodash')
 
 module.exports = (expectedArgs, actualArgs) ->
+  return true if _.eq(expectedArgs, actualArgs)
+  return false if expectedArgs.length != actualArgs.length
+  satisfiesEqualityPlusAnyArgumentMatchers(expectedArgs, actualArgs)
+
+satisfiesEqualityPlusAnyArgumentMatchers = (expectedArgs, actualArgs) ->
   _.eq expectedArgs, actualArgs, (expected, actual) ->
-    return true if _.eq(expectedArgs, actualArgs)
     _.all expectedArgs, (expectedArg, i) ->
-      return true if _.eq(expectedArg, actualArgs[i])
-      if _.isFunction(expectedArg?.__matches)
-        expectedArg.__matches(actualArgs[i])
-      else
-        false
+      argumentMatchesExpectation(expectedArg, actualArgs[i])
+
+argumentMatchesExpectation = (expectedArg, actualArg) ->
+  if _.eq(expectedArg, actualArg)
+    true
+  else if matcher = matcherHidingInExpectedArgument(expectedArg)
+    matcher(actualArg)
+  else
+    false
 
+# This is literally all that's needed to implement argument matchers & captors
+matcherHidingInExpectedArgument = (expectedArg) ->
+  if _.isFunction(expectedArg?.__matches)
+    expectedArg.__matches

test/lib/verify-test.coffee

@@ -29,6 +29,18 @@ describe '.verify', ->
           - called with `("the wrong WOAH")`.
       """
 
+  context 'unsatisfied verify - wrong arg count', ->
+    When -> @testDouble("good", "bad")
+    Then -> shouldThrow (=> @verify(@testDouble("good"))), """
+      Unsatisfied verification on test double.
+
+        Wanted:
+          - called with `("good")`.
+
+        But was actually called:
+          - called with `("good", "bad")`.
+      """
+
   context 'with a named double', ->
     Given -> @testDouble = @create("#footime")
     When -> @result = (shouldThrow => @verify(@testDouble()))