Bug 1751102, part 6 - Add some tests for nsDiscriminatedUnion. r=xpco…

…m-reviewers,nika

Differential Revision: https://phabricator.services.mozilla.com/D137102

xpcom/tests/gtest/TestVariant.cpp

@@ -0,0 +1,156 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include <math.h>
+#include "nsVariant.h"
+#include "gtest/gtest.h"
+
+TEST(Variant, DoubleNaN)
+{
+  nsDiscriminatedUnion du;
+  du.SetFromDouble(NAN);
+
+  uint8_t ui8;
+  EXPECT_EQ(du.ConvertToInt8(&ui8), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  int16_t i16;
+  EXPECT_EQ(du.ConvertToInt16(&i16), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  int32_t i32;
+  EXPECT_EQ(du.ConvertToInt32(&i32), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  int64_t i64;
+  EXPECT_EQ(du.ConvertToInt64(&i64), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  EXPECT_EQ(du.ConvertToUint8(&ui8), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  uint16_t ui16;
+  EXPECT_EQ(du.ConvertToUint16(&ui16), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  uint32_t ui32;
+  EXPECT_EQ(du.ConvertToUint32(&ui32), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  uint64_t ui64;
+  EXPECT_EQ(du.ConvertToUint64(&ui64), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  float f = 0.0f;
+  EXPECT_EQ(du.ConvertToFloat(&f), NS_OK);
+  EXPECT_TRUE(isnan(f));
+
+  double d = 0.0;
+  EXPECT_EQ(du.ConvertToDouble(&d), NS_OK);
+  EXPECT_TRUE(isnan(d));
+
+  bool b = true;
+  EXPECT_EQ(du.ConvertToBool(&b), NS_OK);
+  EXPECT_FALSE(b);
+
+  char c;
+  EXPECT_EQ(du.ConvertToChar(&c), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  char16_t c16;
+  EXPECT_EQ(du.ConvertToWChar(&c16), NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
+
+  nsID id = {};
+  EXPECT_EQ(du.ConvertToID(&id), NS_ERROR_CANNOT_CONVERT_DATA);
+
+  nsAutoString string;
+  EXPECT_EQ(du.ConvertToAString(string), NS_OK);
+  EXPECT_EQ(string, u"NaN"_ns);
+
+  nsAutoCString utf8string;
+  EXPECT_EQ(du.ConvertToAUTF8String(utf8string), NS_OK);
+  EXPECT_EQ(utf8string, "NaN"_ns);
+
+  nsAutoCString autocstring;
+  EXPECT_EQ(du.ConvertToACString(autocstring), NS_OK);
+  EXPECT_EQ(autocstring, "NaN"_ns);
+
+  char* chars = nullptr;
+  EXPECT_EQ(du.ConvertToString(&chars), NS_OK);
+  EXPECT_STREQ(chars, "NaN");
+  free(chars);
+
+  char16_t* wchars = nullptr;
+  EXPECT_EQ(du.ConvertToWString(&wchars), NS_OK);
+  {
+    // gtest doesn't seem to support EXPECT_STREQ on char16_t, so convert
+    // to Gecko strings to do the comparison.
+    nsDependentString wstring(wchars);
+    EXPECT_EQ(wstring, u"NaN"_ns);
+  }
+  free(wchars);
+
+  chars = nullptr;
+  uint32_t size = 0;
+  EXPECT_EQ(du.ConvertToStringWithSize(&size, &chars), NS_OK);
+  EXPECT_STREQ(chars, "NaN");
+  EXPECT_EQ(size, 3u);
+  free(chars);
+
+  wchars = nullptr;
+  size = 0;
+  EXPECT_EQ(du.ConvertToWStringWithSize(&size, &wchars), NS_OK);
+  {
+    // gtest doesn't seem to support EXPECT_STREQ on char16_t, so convert
+    // to Gecko strings to do the comparison.
+    nsDependentString wstring(wchars);
+    EXPECT_EQ(wstring, u"NaN"_ns);
+    EXPECT_EQ(size, 3u);
+  }
+  free(wchars);
+
+  nsISupports* isupports;
+  EXPECT_EQ(du.ConvertToISupports(&isupports), NS_ERROR_CANNOT_CONVERT_DATA);
+
+  nsIID* idp;
+  void* iface;
+  EXPECT_EQ(du.ConvertToInterface(&idp, &iface), NS_ERROR_CANNOT_CONVERT_DATA);
+
+  uint16_t type;
+  nsIID iid;
+  uint32_t count;
+  void* array;
+  EXPECT_EQ(du.ConvertToArray(&type, &iid, &count, &array),
+            NS_ERROR_CANNOT_CONVERT_DATA);
+}
+
+TEST(Variant, Bool)
+{
+  nsDiscriminatedUnion du;
+  bool b = false;
+
+  du.SetFromInt64(12);
+  EXPECT_EQ(du.ConvertToBool(&b), NS_OK);
+  EXPECT_TRUE(b);
+
+  b = true;
+  du.SetFromInt64(0);
+  EXPECT_EQ(du.ConvertToBool(&b), NS_OK);
+  EXPECT_FALSE(b);
+
+  b = true;
+  du.SetFromDouble(1.25);
+  EXPECT_EQ(du.ConvertToBool(&b), NS_OK);
+  EXPECT_TRUE(b);
+
+  b = true;
+  du.SetFromDouble(0.0);
+  EXPECT_EQ(du.ConvertToBool(&b), NS_OK);
+  EXPECT_FALSE(b);
+
+  b = true;
+  du.SetFromDouble(-0.0);
+  EXPECT_EQ(du.ConvertToBool(&b), NS_OK);
+  EXPECT_FALSE(b);
+
+  // This is also checked in the previous test, but I'm including it
+  // here for completeness.
+  b = true;
+  du.SetFromDouble(NAN);
+  EXPECT_EQ(du.ConvertToBool(&b), NS_OK);
+  EXPECT_FALSE(b);
+}

xpcom/tests/gtest/moz.build

@@ -68,6 +68,7 @@ UNIFIED_SOURCES += [
     "TestTimeStamp.cpp",
     "TestTokenizer.cpp",
     "TestUTF.cpp",
+    "TestVariant.cpp",
 ]
 
 if CONFIG["OS_TARGET"] != "Android":