text: // 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/ast/array_accessor_expression.h"
  
  #include "src/ast/identifier_expression.h"
  #include "src/ast/test_helper.h"
  
  namespace tint {
  namespace ast {
  namespace {
  
  using ArrayAccessorExpressionTest = TestHelper;
  
  TEST_F(ArrayAccessorExpressionTest, Create) {
    auto* ary = Expr("ary");
    auto* idx = Expr("idx");
  
    auto* exp = create<ArrayAccessorExpression>(ary, idx);
    ASSERT_EQ(exp->array(), ary);
    ASSERT_EQ(exp->idx_expr(), idx);
  }
  
  TEST_F(ArrayAccessorExpressionTest, CreateWithSource) {
    auto* ary = Expr("ary");
    auto* idx = Expr("idx");
  
    auto* exp = create<ArrayAccessorExpression>(Source{Source::Location{20, 2}},
                                                ary, idx);
    auto src = exp->source();
    EXPECT_EQ(src.range.begin.line, 20u);
    EXPECT_EQ(src.range.begin.column, 2u);
  }
  
  TEST_F(ArrayAccessorExpressionTest, IsArrayAccessor) {
    auto* ary = Expr("ary");
    auto* idx = Expr("idx");
  
    auto* exp = create<ArrayAccessorExpression>(ary, idx);
    EXPECT_TRUE(exp->Is<ArrayAccessorExpression>());
  }
  
  TEST_F(ArrayAccessorExpressionTest, IsValid) {
    auto* ary = Expr("ary");
    auto* idx = Expr("idx");
  
    auto* exp = create<ArrayAccessorExpression>(ary, idx);
    EXPECT_TRUE(exp->IsValid());
  }
  
  TEST_F(ArrayAccessorExpressionTest, IsValid_MissingArray) {
    auto* idx = Expr("idx");
  
    auto* exp = create<ArrayAccessorExpression>(nullptr, idx);
    EXPECT_FALSE(exp->IsValid());
  }
  
  TEST_F(ArrayAccessorExpressionTest, IsValid_MissingIndex) {
    auto* ary = Expr("ary");
  
    auto* exp = create<ArrayAccessorExpression>(ary, nullptr);
    EXPECT_FALSE(exp->IsValid());
  }
  
  TEST_F(ArrayAccessorExpressionTest, IsValid_InvalidArray) {
    auto* ary = Expr("");
    auto* idx = Expr("idx");
    auto* exp = create<ArrayAccessorExpression>(ary, idx);
    EXPECT_FALSE(exp->IsValid());
  }
  
  TEST_F(ArrayAccessorExpressionTest, IsValid_InvalidIndex) {
    auto* ary = Expr("ary");
    auto* idx = Expr("");
    auto* exp = create<ArrayAccessorExpression>(ary, idx);
    EXPECT_FALSE(exp->IsValid());
  }
  
  TEST_F(ArrayAccessorExpressionTest, ToStr) {
    auto* ary = Expr("ary");
    auto* idx = Expr("idx");
  
    auto* exp = create<ArrayAccessorExpression>(ary, idx);
    std::ostringstream out;
    exp->to_str(out, 2);
  
    EXPECT_EQ(demangle(out.str()), R"(  ArrayAccessor[not set]{
      Identifier[not set]{ary}
      Identifier[not set]{idx}
    }
  )");
  }
  
  }  // namespace
  }  // namespace ast
  }  // namespace tint
  