1 files changed, 74 insertions, 0 deletions
diff --git a/errors/debug_test.go b/errors/debug_test.go
new file mode 100755
index 00000000..bc866bc8
--- /dev/null
+++ b/errors/debug_test.go
@@ -0,0 +1,74 @@
+// +build debug
+
+package errors
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+	"testing"
+)
+
+var errorLines = strings.Split(strings.TrimSpace(`
+	.*/errors/debug_test.go:\d+:  github.com/ValeryPiashchynski/errors.func1:
+	.*/errors/debug_test.go:\d+:  ...T.func2:
+	.*/errors/debug_test.go:\d+:  ...func3:
+	.*/errors/debug_test.go:\d+:  ...func4: func2 invoke func3: Network error:
+	func4 operation: error in action
+`), "\n")
+
+var errorLineREs = make([]*regexp.Regexp, len(errorLines))
+
+func init() {
+	for i, s := range errorLines {
+		errorLineREs[i] = regexp.MustCompile(fmt.Sprintf("^%s", s))
+	}
+}
+
+func TestsDebug(t *testing.T) {
+	got := printErr(t, func1())
+	lines := strings.Split(got, "\n")
+	for i, re := range errorLineREs {
+		if i >= len(lines) {
+			// Handled by line number check.
+			break
+		}
+		if !re.MatchString(lines[i]) {
+			t.Errorf("error does not match at line %v, got:\n\t%q\nwant:\n\t%q", i, lines[i], re)
+		}
+	}
+	if got, want := len(lines), len(errorLines); got != want {
+		t.Errorf("got %v lines of errors, want %v", got, want)
+	}
+}
+
+type T struct{}
+
+func printErr(t *testing.T, err error) string {
+	return err.Error()
+}
+
+func func1() error {
+	var t T
+	return t.func2()
+}
+
+func (T) func2() error {
+	o := Op("func2 invoke func3")
+	return E(o, func3())
+}
+
+func func3() error {
+	return func4()
+}
+
+func func4() error {
+	o := Op("func4 operation")
+	return E(o, Network, Str("error in action"))
+}
+
+///Users/0xdev/Projects/repo/errors/debug_test.go:53: github.com/ValeryPiashchynski/errors.func1:
+///Users/0xdev/Projects/repo/errors/debug_test.go:58: ...T.func2:
+///Users/0xdev/Projects/repo/errors/debug_test.go:62: ...func3:
+///Users/0xdev/Projects/repo/errors/debug_test.go:67: ...func4: func2 invoke func3: Network error:
+//func4 operation: error in action