Replace bash release helper scripts with Go progam

cmd/gorepomod/internal/edit/editor_test.go

@@ -0,0 +1,32 @@
+package edit
+
+import (
+	"testing"
+)
+
+func TestUpstairs(t *testing.T) {
+	var testCases = map[string]struct {
+		depth    int
+		expected string
+	}{
+		"zero": {
+			depth:    0,
+			expected: "",
+		},
+		"one": {
+			depth:    1,
+			expected: "../",
+		},
+		"five": {
+			depth:    5,
+			expected: "../../../../../",
+		},
+	}
+	for n, tc := range testCases {
+		if tc.expected != upstairs(tc.depth) {
+			t.Fatalf(
+				"%s: for depth %d, expected %q, got %q",
+				n, tc.depth, tc.expected, upstairs(tc.depth))
+		}
+	}
+}