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diff --git a/src/reader/wgsl/parser_impl_and_expression_test.cc b/src/reader/wgsl/parser_impl_and_expression_test.cc
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+++ b/src/reader/wgsl/parser_impl_and_expression_test.cc
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+// 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 "gtest/gtest.h"
+#include "src/ast/bool_literal.h"
+#include "src/ast/const_initializer_expression.h"
+#include "src/ast/identifier_expression.h"
+#include "src/ast/relational_expression.h"
+#include "src/reader/wgsl/parser_impl.h"
+
+namespace tint {
+namespace reader {
+namespace wgsl {
+
+using ParserImplTest = testing::Test;
+
+TEST_F(ParserImplTest, AndExpression_Parses) {
+ ParserImpl p{"a & true"};
+ auto e = p.and_expression();
+ ASSERT_FALSE(p.has_error()) << p.error();
+ ASSERT_NE(e, nullptr);
+
+ ASSERT_TRUE(e->IsRelational());
+ auto rel = e->AsRelational();
+ EXPECT_EQ(ast::Relation::kAnd, rel->relation());
+
+ ASSERT_TRUE(rel->lhs()->IsIdentifier());
+ auto ident = rel->lhs()->AsIdentifier();
+ ASSERT_EQ(ident->name().size(), 1);
+ EXPECT_EQ(ident->name()[0], "a");
+
+ ASSERT_TRUE(rel->rhs()->IsInitializer());
+ ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
+ auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+ ASSERT_TRUE(init->literal()->IsBool());
+ ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
+}
+
+TEST_F(ParserImplTest, AndExpression_InvalidLHS) {
+ ParserImpl p{"if (a) {} & true"};
+ auto e = p.and_expression();
+ ASSERT_FALSE(p.has_error()) << p.error();
+ ASSERT_EQ(e, nullptr);
+}
+
+TEST_F(ParserImplTest, AndExpression_InvalidRHS) {
+ ParserImpl p{"true & if (a) {}"};
+ auto e = p.and_expression();
+ ASSERT_TRUE(p.has_error());
+ ASSERT_EQ(e, nullptr);
+ EXPECT_EQ(p.error(), "1:8: unable to parse right side of & expression");
+}
+
+TEST_F(ParserImplTest, AndExpression_NoOr_ReturnsLHS) {
+ ParserImpl p{"a true"};
+ auto e = p.and_expression();
+ ASSERT_FALSE(p.has_error()) << p.error();
+ ASSERT_NE(e, nullptr);
+ ASSERT_TRUE(e->IsIdentifier());
+}
+
+} // namespace wgsl
+} // namespace reader
+} // namespace tint
