fixes issues found with summing in #31

cmd/format-coverage.go

@@ -1,13 +1,13 @@
 package cmd
 
 import (
-	"errors"
 	"io"
 	"os"
 	"path/filepath"
 
 	"github.com/codeclimate/test-reporter/formatters"
 	"github.com/codeclimate/test-reporter/formatters/ruby"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
@@ -38,26 +38,33 @@ func (f CoverageFormatter) Save() error {
 	}
 	err = in.Parse()
 	if err != nil {
-		return err
+		return errors.WithStack(err)
 	}
 
 	var out io.Writer
 	if formatOptions.Print || formatOptions.Output == "-" {
 		out = os.Stdout
 	} else {
-		os.MkdirAll(filepath.Dir(formatOptions.Output), 0755)
+		err = os.MkdirAll(filepath.Dir(formatOptions.Output), 0755)
+		if err != nil {
+			return errors.WithStack(err)
+		}
 		out, err = os.Create(formatOptions.Output)
 		if err != nil {
-			return err
+			return errors.WithStack(err)
 		}
 	}
 
 	rep, err := in.Format()
 	if err != nil {
-		return err
+		return errors.WithStack(err)
 	}
 
-	return rep.Save(out)
+	err = rep.Save(out)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	return nil
 }
 
 func init() {

env/git.go

@@ -6,6 +6,8 @@ import (
 	"os/exec"
 	"strconv"
 	"strings"
+
+	"github.com/pkg/errors"
 )
 
 type Git struct {
@@ -37,25 +39,25 @@ func findGitInfo() (Git, error) {
 	cmd := exec.Command("git", "rev-parse", "--abbrev-ref", "HEAD")
 	out, err := cmd.Output()
 	if err != nil {
-		return g, err
+		return g, errors.WithStack(err)
 	}
 	g.Branch = strings.TrimSpace(string(out))
 
 	cmd = exec.Command("git", "log", "-1", "--pretty=format:%H")
 	out, err = cmd.Output()
 	if err != nil {
-		return g, err
+		return g, errors.WithStack(err)
 	}
 	g.CommitSHA = strings.TrimSpace(string(out))
 
 	cmd = exec.Command("git", "log", "-1", "--pretty=format:%ct")
 	out, err = cmd.Output()
 	if err != nil {
-		return g, err
+		return g, errors.WithStack(err)
 	}
 	g.CommittedAt, err = strconv.Atoi(strings.TrimSpace(string(out)))
 	if err != nil {
-		return g, err
+		return g, errors.WithStack(err)
 	}
 	return g, nil
 }
@@ -68,7 +70,7 @@ func GitSHA(path string) (string, error) {
 	cmd := exec.Command("git", args...)
 	out, err := cmd.Output()
 	if err != nil {
-		return "", err
+		return "", errors.WithStack(err)
 	}
 	return strings.TrimSpace(string(out)), nil
 }