Add EscapeStringOptions and escapeString tests

Change-Id: I86ead2f969c9e03c9edfa51bbc92ee06393fd7d6

tests/unit/libutil/escape-string.cc

@@ -0,0 +1,35 @@
+#include "escape-string.hh"
+#include "ansicolor.hh"
+#include <gtest/gtest.h>
+
+namespace nix {
+
+TEST(EscapeString, simple) {
+  auto escaped = escapeString("puppy");
+  ASSERT_EQ(escaped, "\"puppy\"");
+}
+
+TEST(EscapeString, escaping) {
+  auto escaped = escapeString("\n\r\t \" \\ ${ooga booga}");
+  ASSERT_EQ(escaped, R"RAW("\n\r\t \" \\ \${ooga booga}")RAW");
+}
+
+TEST(EscapeString, maxLength) {
+  auto escaped = escapeString("puppy", {.maxLength = 5});
+  ASSERT_EQ(escaped, "\"puppy\"");
+
+  escaped = escapeString("puppy doggy", {.maxLength = 5});
+  ASSERT_EQ(escaped, "\"puppy\" «6 bytes elided»");
+}
+
+TEST(EscapeString, ansiColors) {
+  auto escaped = escapeString("puppy doggy", {.maxLength = 5, .outputAnsiColors = true});
+  ASSERT_EQ(escaped, ANSI_MAGENTA "\"puppy\" " ANSI_FAINT "«6 bytes elided»" ANSI_NORMAL);
+}
+
+TEST(EscapeString, escapeNonPrinting) {
+  auto escaped = escapeString("puppy\u0005doggy", {.escapeNonPrinting = true});
+  ASSERT_EQ(escaped, "\"puppy\\x05doggy\"");
+}
+
+} // namespace nix

tests/unit/meson.build

@@ -39,6 +39,7 @@ libutil_tests_sources = files(
   'libutil/closure.cc',
   'libutil/compression.cc',
   'libutil/config.cc',
+  'libutil/escape-string.cc',
   'libutil/git.cc',
   'libutil/hash.cc',
   'libutil/hilite.cc',