json: Escape strings using \u escape sequences, add test

This allows us to correctly encode strings containing quotation
marks, escape characters and control characters.

The test case is a bit nasty because it embeds private-cachefile.cc
for linkage reasons.

1 files changed, 45 insertions, 0 deletions

diff --git a/test/libapt/json_test.cc b/test/libapt/json_test.cc
new file mode 100644
index 000000000..e3317afc4
--- /dev/null
+++ b/test/libapt/json_test.cc
@@ -0,0 +1,45 @@
+#include <config.h>
+#include "../../apt-private/private-cachefile.cc"
+#include "../../apt-private/private-json-hooks.cc"
+#include <gtest/gtest.h>
+#include <string>
+
+TEST(JsonTest, JsonString)
+{
+   std::ostringstream os;
+
+   // Check for escaping backslash and quotation marks, and ensure that we do not change number formatting
+   JsonWriter(os).value("H al\"l\\o").value(17);
+
+   EXPECT_EQ("\"H al\\u0022l\\u005Co\"17", os.str());
+
+   for (int i = 0; i <= 0x1F; i++)
+   {
+      os.str("");
+
+      JsonWriter(os).encodeString(os, std::string("X") + char(i) + "Z");
+
+      std::string exp;
+      strprintf(exp, "\"X\\u%04XZ\"", i);
+
+      EXPECT_EQ(exp, os.str());
+   }
+}
+
+TEST(JsonTest, JsonObject)
+{
+   std::ostringstream os;
+
+   JsonWriter(os).beginObject().name("key").value("value").endObject();
+
+   EXPECT_EQ("{\"key\":\"value\"}", os.str());
+}
+
+TEST(JsonTest, JsonArrayAndValues)
+{
+   std::ostringstream os;
+
+   JsonWriter(os).beginArray().value(0).value("value").value(1).value(true).endArray();
+
+   EXPECT_EQ("[0,\"value\",1,true]", os.str());
+}