1 files changed, 40 insertions, 0 deletions
diff --git a/src/cmd/internal/obj/line_test.go b/src/cmd/internal/obj/line_test.go
new file mode 100644
index 0000000..e0db7f3
--- /dev/null
+++ b/src/cmd/internal/obj/line_test.go
@@ -0,0 +1,40 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package obj
+
+import (
+	"cmd/internal/src"
+	"fmt"
+	"testing"
+)
+
+func TestLinkgetlineFromPos(t *testing.T) {
+	ctxt := new(Link)
+	ctxt.hash = make(map[string]*LSym)
+	ctxt.statichash = make(map[string]*LSym)
+
+	afile := src.NewFileBase("a.go", "a.go")
+	bfile := src.NewFileBase("b.go", "/foo/bar/b.go")
+	lfile := src.NewLinePragmaBase(src.MakePos(afile, 8, 1), "linedir", "linedir", 100, 1)
+
+	var tests = []struct {
+		pos  src.Pos
+		want string
+	}{
+		{src.NoPos, "??:0"},
+		{src.MakePos(afile, 1, 0), "a.go:1"},
+		{src.MakePos(afile, 2, 0), "a.go:2"},
+		{src.MakePos(bfile, 10, 4), "/foo/bar/b.go:10"},
+		{src.MakePos(lfile, 10, 0), "linedir:102"}, // 102 == 100 + (10 - (7+1))
+	}
+
+	for _, test := range tests {
+		f, l := linkgetlineFromPos(ctxt, ctxt.PosTable.XPos(test.pos))
+		got := fmt.Sprintf("%s:%d", f, l)
+		if got != src.FileSymPrefix+test.want {
+			t.Errorf("linkgetline(%v) = %q, want %q", test.pos, got, test.want)
+		}
+	}
+}