1 files changed, 50 insertions, 0 deletions
diff --git a/src/cmd/internal/objabi/line_test.go b/src/cmd/internal/objabi/line_test.go
new file mode 100644
index 0000000..1fa0ff1
--- /dev/null
+++ b/src/cmd/internal/objabi/line_test.go
@@ -0,0 +1,50 @@
+// Copyright 2019 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 objabi
+
+import (
+	"path/filepath"
+	"runtime"
+	"testing"
+)
+
+// On Windows, "/foo" is reported as a relative path
+// (it is relative to the current drive letter),
+// so we need add a drive letter to test absolute path cases.
+func drive() string {
+	if runtime.GOOS == "windows" {
+		return "c:"
+	}
+	return ""
+}
+
+var absFileTests = []struct {
+	dir      string
+	file     string
+	rewrites string
+	abs      string
+}{
+	{"/d", "f", "", "/d/f"},
+	{"/d", drive() + "/f", "", drive() + "/f"},
+	{"/d", "f/g", "", "/d/f/g"},
+	{"/d", drive() + "/f/g", "", drive() + "/f/g"},
+
+	{"/d", "f", "/d/f", "??"},
+	{"/d", "f/g", "/d/f", "g"},
+	{"/d", "f/g", "/d/f=>h", "h/g"},
+	{"/d", "f/g", "/d/f=>/h", "/h/g"},
+	{"/d", "f/g", "/d/f=>/h;/d/e=>/i", "/h/g"},
+	{"/d", "e/f", "/d/f=>/h;/d/e=>/i", "/i/f"},
+}
+
+func TestAbsFile(t *testing.T) {
+	for _, tt := range absFileTests {
+		abs := filepath.FromSlash(AbsFile(filepath.FromSlash(tt.dir), filepath.FromSlash(tt.file), tt.rewrites))
+		want := filepath.FromSlash(tt.abs)
+		if abs != want {
+			t.Errorf("AbsFile(%q, %q, %q) = %q, want %q", tt.dir, tt.file, tt.rewrites, abs, want)
+		}
+	}
+}