tint->dawn: Shuffle source tree in preperation of merging repos

docs/    -> docs/tint/
fuzzers/ -> src/tint/fuzzers/
samples/ -> src/tint/cmd/
src/     -> src/tint/
test/    -> test/tint/

BUG=tint:1418,tint:1433

Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/src/tint/symbol_test.cc b/src/tint/symbol_test.cc
new file mode 100644
index 0000000..8e3f6c0
--- /dev/null
+++ b/src/tint/symbol_test.cc
@@ -0,0 +1,51 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/tint/symbol.h"
+
+#include "gtest/gtest.h"
+
+namespace tint {
+namespace {
+
+using SymbolTest = testing::Test;
+
+TEST_F(SymbolTest, ToStr) {
+  Symbol sym(1, ProgramID::New());
+  EXPECT_EQ("$1", sym.to_str());
+}
+
+TEST_F(SymbolTest, CopyAssign) {
+  Symbol sym1(1, ProgramID::New());
+  Symbol sym2;
+
+  EXPECT_FALSE(sym2.IsValid());
+  sym2 = sym1;
+  EXPECT_TRUE(sym2.IsValid());
+  EXPECT_EQ(sym2, sym1);
+}
+
+TEST_F(SymbolTest, Comparison) {
+  auto program_id = ProgramID::New();
+  Symbol sym1(1, program_id);
+  Symbol sym2(2, program_id);
+  Symbol sym3(1, program_id);
+
+  EXPECT_TRUE(sym1 == sym3);
+  EXPECT_FALSE(sym1 == sym2);
+  EXPECT_FALSE(sym3 == sym2);
+}
+
+}  // namespace
+}  // namespace tint