Add support for parsing git trailers (#614)

Adds a wrapper for git_message_trailers which returns a slice of trailer
structs.

1 files changed, 42 insertions, 0 deletions

diff --git a/message_test.go b/message_test.go
new file mode 100644
index 0000000..f33ccb7
--- /dev/null
+++ b/message_test.go
@@ -0,0 +1,42 @@
+package git
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestTrailers(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		input    string
+		expected []Trailer
+	}{
+		{
+			"commit with zero trailers\n",
+			[]Trailer{},
+		},
+		{
+			"commit with one trailer\n\nCo-authored-by: Alice <[email protected]>\n",
+			[]Trailer{
+				Trailer{Key: "Co-authored-by", Value: "Alice <[email protected]>"},
+			},
+		},
+		{
+			"commit with two trailers\n\nCo-authored-by: Alice <[email protected]>\nSigned-off-by: Bob <[email protected]>\n",
+			[]Trailer{
+				Trailer{Key: "Co-authored-by", Value: "Alice <[email protected]>"},
+				Trailer{Key: "Signed-off-by", Value: "Bob <[email protected]>"}},
+		},
+	}
+	for _, test := range tests {
+		fmt.Printf("%s", test.input)
+		actual, err := MessageTrailers(test.input)
+		if err != nil {
+			t.Errorf("Trailers returned an unexpected error: %v", err)
+		}
+		if !reflect.DeepEqual(test.expected, actual) {
+			t.Errorf("expecting %#v\ngot %#v", test.expected, actual)
+		}
+	}
+}