Add negative tests to SignedExchangeUtils unit test

Add negative tests to SignedExchangeUtils unit test to test
how we deal with questionable/wrong content types.

Bug: 803774

Change-Id: If726951a4fb96506251ad7fd1ac26a6940174e6c
Reviewed-on: https://chromium-review.googlesource.com/1203995Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Rob Buis <rbuis@igalia.com>
Cr-Commit-Position: refs/heads/master@{#589495}

content/browser/web_package/signed_exchange_utils_unittest.cc

@@ -9,6 +9,12 @@
 namespace content {
 namespace signed_exchange_utils {
 
+TEST(SignedExchangeUtilsTest, VersionParam_WrongEssence) {
+  base::Optional<SignedExchangeVersion> version =
+      GetSignedExchangeVersion("application/signed-foo");
+  EXPECT_FALSE(version.has_value());
+}
+
 TEST(SignedExchangeUtilsTest, VersionParam_None) {
   base::Optional<SignedExchangeVersion> version =
       GetSignedExchangeVersion("application/signed-exchange");
@@ -63,6 +69,24 @@ TEST(SignedExchangeUtilsTest, VersionParam_Quoted) {
   EXPECT_EQ(version, SignedExchangeVersion::kB2);
 }
 
+TEST(SignedExchangeUtilsTest, VersionParam_QuotesOpen) {
+  base::Optional<SignedExchangeVersion> version =
+      GetSignedExchangeVersion("application/signed-exchange;v=\"b2");
+  EXPECT_EQ(version, SignedExchangeVersion::kB2);
+}
+
+TEST(SignedExchangeUtilsTest, VersionParam_QuotesOpenNonV) {
+  base::Optional<SignedExchangeVersion> version =
+      GetSignedExchangeVersion("application/signed-exchange;v=\"b2;r=\"b2");
+  EXPECT_EQ(version, SignedExchangeVersion::kUnknown);
+}
+
+TEST(SignedExchangeUtilsTest, VersionParam_QuotesOpenNonV2) {
+  base::Optional<SignedExchangeVersion> version =
+      GetSignedExchangeVersion("application/signed-exchange;v=\"b2\";r=\"b2");
+  EXPECT_EQ(version, SignedExchangeVersion::kB2);
+}
+
 TEST(SignedExchangeUtilsTest, VersionParam_UseCaseInsensitiveMatch) {
   base::Optional<SignedExchangeVersion> version =
       GetSignedExchangeVersion("Application/Signed-Exchange;V=b2");