2 files changed, 95 insertions, 0 deletions
diff --git a/src/gobang.go b/src/gobang.go
index c9e9e01..921597e 100644
--- a/src/gobang.go
+++ b/src/gobang.go
@@ -58,6 +58,23 @@ var (
 
 
 
+func SomeError(errs []error) error {
+	for _, err := range errs {
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func SomeFnError(fns [](func() error)) error {
+	errs := make([]error, len(fns))
+	for i, fn := range fns {
+		errs[i] = fn()
+	}
+	return SomeError(errs)
+}
+
 func Random(length int) []byte {
 	buffer := make([]byte, length)
 	_, err := io.ReadFull(rand.Reader, buffer)
diff --git a/tests/gobang.go b/tests/gobang.go
index e35f358..e2dd61b 100644
--- a/tests/gobang.go
+++ b/tests/gobang.go
@@ -13,6 +13,82 @@ import (
 
 
 
+func test_SomeError() {
+	TestStart("SomeError()")
+
+	Testing("an empty array is nil", func() {
+		given := []error{}
+		AssertEqual(SomeError(given), nil)
+	})
+
+	Testing("only nil values is nil", func() {
+		given := []error{
+			nil,
+			nil,
+			nil,
+		}
+		AssertEqual(SomeError(given), nil)
+	})
+
+	Testing("we get the first non-nil value", func() {
+		err1 := errors.New("error 1")
+		err2 := errors.New("error 2")
+		given := []error{
+			nil,
+			err1,
+			err2,
+		}
+		AssertEqual(SomeError(given), err1)
+	})
+}
+
+func test_SomeFnError() {
+	TestStart("SomeFnError()")
+
+	Testing("an empty arrays is also nil", func() {
+		given := [](func() error){}
+		AssertEqual(SomeFnError(given), nil)
+	})
+
+	Testing("all functions are called", func() {
+		i := 0
+		fn := func() error {
+			i++
+			return nil
+		}
+		given := [](func() error){
+			fn,
+			fn,
+			fn,
+		}
+		AssertEqual(SomeFnError(given), nil)
+		AssertEqual(i, 3)
+	})
+
+	Testing("we call all functions even if we get an error", func() {
+		i := 0
+		errs := []error{
+			nil,
+			nil,
+			errors.New("fn error 2"),
+			errors.New("fn error 3"),
+			nil,
+		}
+		fn := func() error {
+			i++
+			return errs[i]
+		}
+		given := [](func() error){
+			fn,
+			fn,
+			fn,
+			fn,
+		}
+		AssertEqual(SomeFnError(given), errs[2])
+		AssertEqual(i, 4)
+	})
+}
+
 func test_Random() {
 	TestStart("Random()")
 
@@ -788,6 +864,8 @@ func test_setHostname() {
 
 
 func MainTest() {
+	test_SomeError()
+	test_SomeFnError()
 	test_Random()
 	test_sourceInfo()
 	test_logArgs()