add newCtxRepo test cases

internal/gps/_testdata/src/corrupt/git/info/exclude

@@ -0,0 +1,6 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~

internal/gps/vcs_repo_test.go

@@ -9,15 +9,19 @@ import (
 	"errors"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"testing"
 	"time"
 
 	"github.com/Masterminds/vcs"
+	"github.com/golang/dep/internal/gps/internal/fs"
 )
 
 // original implementation of these test files come from
 // https://github.com/Masterminds/vcs test files
 
+const gitRemoteTestRepo = "https://github.com/Masterminds/VCSTestRepo"
+
 func TestErrs(t *testing.T) {
 	err := newVcsLocalErrorOr("", context.Canceled, "")
 	if err != context.Canceled {
@@ -46,6 +50,46 @@ func TestErrs(t *testing.T) {
 	}
 }
 
+func TestNewCtxRepo(t *testing.T) {
+	t.Parallel()
+
+	tempDir, err := ioutil.TempDir("", "go-ctx-repo-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		err = os.RemoveAll(tempDir)
+		if err != nil {
+			t.Error(err)
+		}
+	}()
+	cwd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	src := filepath.Join(cwd, "_testdata", "src", "corrupt", "git")
+	dest := filepath.Join(tempDir, ".git")
+	err = fs.CopyDir(src, dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = getVCSRepo(vcs.Git, gitRemoteTestRepo, tempDir)
+	if err != nil {
+		if _, ok := err.(*vcs.LocalError); !ok {
+			t.Fatalf("expected a local error but got: %v\n", err)
+		}
+	} else {
+		t.Fatal("expected getVCSRepo to fail when pointing to a corrupt local path. It is possible that vcs.GitNewRepo updated to gracefully handle this test scenario. Check the return of vcs.GitNewRepo.")
+	}
+
+	_, err = newCtxRepo(vcs.Git, gitRemoteTestRepo, tempDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
 func testSvnRepo(t *testing.T) {
 	t.Parallel()
 
@@ -219,7 +263,7 @@ func testGitRepo(t *testing.T) {
 		}
 	}()
 
-	rep, err := vcs.NewGitRepo("https://github.com/Masterminds/VCSTestRepo", tempDir+"/VCSTestRepo")
+	rep, err := vcs.NewGitRepo(gitRemoteTestRepo, tempDir+"/VCSTestRepo")
 	if err != nil {
 		t.Fatal(err)
 	}