Fix variadic argument matching

gomock/call.go

@@ -339,14 +339,14 @@ func (c *Call) matches(args []interface{}) error {
 			// The last arg has a possibility of a variadic argument, so let it branch
 
 			// sample: Foo(a int, b int, c ...int)
-			if len(c.args) == len(args) {
+			if i < len(c.args) && i < len(args) {
 				if m.Matches(args[i]) {
 					// Got Foo(a, b, c) want Foo(matcherA, matcherB, gomock.Any())
 					// Got Foo(a, b, c) want Foo(matcherA, matcherB, someSliceMatcher)
 					// Got Foo(a, b, c) want Foo(matcherA, matcherB, matcherC)
 					// Got Foo(a, b) want Foo(matcherA, matcherB)
 					// Got Foo(a, b, c, d) want Foo(matcherA, matcherB, matcherC, matcherD)
-					break
+					continue
 				}
 			}
 

sample/user_test.go

@@ -68,12 +68,12 @@ func TestVariadicFunction(t *testing.T) {
 	defer ctrl.Finish()
 
 	mockIndex := mock_user.NewMockIndex(ctrl)
-	mockIndex.EXPECT().Ellip("%d", 0, 1, 1, 2, 3).Do(func(format string, nums ...int) {
+	mockIndex.EXPECT().Ellip("%d", 5, 6, 7, 8).Do(func(format string, nums ...int) {
 		sum := 0
 		for _, value := range nums {
 			sum += value
 		}
-		if sum != 7 {
+		if sum != 26 {
 			t.Errorf("Expected 7, got %d", sum)
 		}
 	})
@@ -82,7 +82,7 @@ func TestVariadicFunction(t *testing.T) {
 		for _, value := range nums {
 			sum += value
 		}
-		if sum != 7 {
+		if sum != 10 {
 			t.Errorf("Expected 7, got %d", sum)
 		}
 	})
@@ -114,8 +114,8 @@ func TestVariadicFunction(t *testing.T) {
 		}
 	})
 
-	mockIndex.Ellip("%d", 0, 1, 1, 2, 3)
-	mockIndex.Ellip("%d", 0, 1, 1, 2, 3)
+	mockIndex.Ellip("%d", 1, 2, 3, 4) // Match second matcher.
+	mockIndex.Ellip("%d", 5, 6, 7, 8) // Match first matcher.
 	mockIndex.Ellip("%d", 0)
 	mockIndex.Ellip("%d")
 	mockIndex.Ellip("%d")