diff --git a/src/writer/spirv/builder_assign_test.cc b/src/writer/spirv/builder_assign_test.cc
index 99c3af730b..7847d065b6 100644
--- a/src/writer/spirv/builder_assign_test.cc
+++ b/src/writer/spirv/builder_assign_test.cc
@@ -15,12 +15,20 @@
 #include <memory>
 
 #include "gtest/gtest.h"
+#include "src/ast/array_accessor_expression.h"
 #include "src/ast/assignment_statement.h"
 #include "src/ast/float_literal.h"
 #include "src/ast/identifier_expression.h"
+#include "src/ast/int_literal.h"
+#include "src/ast/member_accessor_expression.h"
 #include "src/ast/scalar_constructor_expression.h"
+#include "src/ast/struct.h"
+#include "src/ast/struct_member.h"
 #include "src/ast/type/f32_type.h"
+#include "src/ast/type/i32_type.h"
+#include "src/ast/type/struct_type.h"
 #include "src/ast/type/vector_type.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/context.h"
 #include "src/type_determiner.h"
 #include "src/writer/spirv/builder.h"
@@ -35,7 +43,6 @@ using BuilderTest = testing::Test;
 
 TEST_F(BuilderTest, Assign_Var) {
   ast::type::F32Type f32;
-  ast::type::VectorType vec(&f32, 3);
 
   ast::Variable v("var", ast::StorageClass::kOutput, &f32);
 
@@ -70,9 +77,214 @@ TEST_F(BuilderTest, Assign_Var) {
 )");
 }
 
-TEST_F(BuilderTest, DISABLED_Assign_StructMember) {}
+TEST_F(BuilderTest, Assign_StructMember) {
+  ast::type::F32Type f32;
 
-TEST_F(BuilderTest, DISABLED_Assign_Vector) {}
+  // my_struct {
+  //   a : f32
+  //   b : f32
+  // }
+  // var ident : my_struct
+  // ident.b = 4.0;
+
+  ast::StructMemberDecorationList decos;
+  ast::StructMemberList members;
+  members.push_back(
+      std::make_unique<ast::StructMember>("a", &f32, std::move(decos)));
+  members.push_back(
+      std::make_unique<ast::StructMember>("b", &f32, std::move(decos)));
+
+  auto s = std::make_unique<ast::Struct>(ast::StructDecoration::kNone,
+                                         std::move(members));
+  ast::type::StructType s_type(std::move(s));
+  s_type.set_name("my_struct");
+
+  ast::Variable v("ident", ast::StorageClass::kFunction, &s_type);
+
+  auto ident = std::make_unique<ast::MemberAccessorExpression>(
+      std::make_unique<ast::IdentifierExpression>("ident"),
+      std::make_unique<ast::IdentifierExpression>("b"));
+
+  auto val = std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 4.0f));
+
+  ast::AssignmentStatement assign(std::move(ident), std::move(val));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  td.RegisterVariableForTesting(&v);
+
+  ASSERT_TRUE(td.DetermineResultType(&assign)) << td.error();
+
+  Builder b(&mod);
+  b.push_function(Function{});
+  EXPECT_TRUE(b.GenerateGlobalVariable(&v)) << b.error();
+  ASSERT_FALSE(b.has_error()) << b.error();
+
+  EXPECT_TRUE(b.GenerateAssignStatement(&assign)) << b.error();
+  EXPECT_FALSE(b.has_error());
+
+  EXPECT_EQ(DumpInstructions(b.types()), R"(%4 = OpTypeFloat 32
+%3 = OpTypeStruct %4 %4
+%2 = OpTypePointer Function %3
+%1 = OpVariable %2 Function
+%5 = OpTypeInt 32 0
+%6 = OpConstant %5 1
+%7 = OpTypePointer Function %4
+%9 = OpConstant %4 4
+)");
+
+  EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
+            R"(%8 = OpAccessChain %7 %1 %6
+OpStore %8 %9
+)");
+}
+
+TEST_F(BuilderTest, Assign_Vector) {
+  ast::type::F32Type f32;
+  ast::type::VectorType vec3(&f32, 3);
+
+  ast::Variable v("var", ast::StorageClass::kOutput, &vec3);
+
+  auto ident = std::make_unique<ast::IdentifierExpression>("var");
+
+  ast::ExpressionList vals;
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
+
+  auto val =
+      std::make_unique<ast::TypeConstructorExpression>(&vec3, std::move(vals));
+
+  ast::AssignmentStatement assign(std::move(ident), std::move(val));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  td.RegisterVariableForTesting(&v);
+
+  ASSERT_TRUE(td.DetermineResultType(&assign)) << td.error();
+
+  Builder b(&mod);
+  b.push_function(Function{});
+  EXPECT_TRUE(b.GenerateGlobalVariable(&v)) << b.error();
+  ASSERT_FALSE(b.has_error()) << b.error();
+
+  EXPECT_TRUE(b.GenerateAssignStatement(&assign)) << b.error();
+  EXPECT_FALSE(b.has_error());
+
+  EXPECT_EQ(DumpInstructions(b.types()), R"(%4 = OpTypeFloat 32
+%3 = OpTypeVector %4 3
+%2 = OpTypePointer Output %3
+%1 = OpVariable %2 Output
+%5 = OpConstant %4 1
+%6 = OpConstant %4 3
+%7 = OpConstantComposite %3 %5 %5 %6
+)");
+
+  EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()), R"(OpStore %1 %7
+)");
+}
+
+TEST_F(BuilderTest, Assign_Vector_MemberByName) {
+  ast::type::F32Type f32;
+  ast::type::VectorType vec3(&f32, 3);
+
+  // var.y = 1
+
+  ast::Variable v("var", ast::StorageClass::kOutput, &vec3);
+
+  auto ident = std::make_unique<ast::MemberAccessorExpression>(
+      std::make_unique<ast::IdentifierExpression>("var"),
+      std::make_unique<ast::IdentifierExpression>("y"));
+  auto val = std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.0f));
+
+  ast::AssignmentStatement assign(std::move(ident), std::move(val));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  td.RegisterVariableForTesting(&v);
+
+  ASSERT_TRUE(td.DetermineResultType(&assign)) << td.error();
+
+  Builder b(&mod);
+  b.push_function(Function{});
+  EXPECT_TRUE(b.GenerateGlobalVariable(&v)) << b.error();
+  ASSERT_FALSE(b.has_error()) << b.error();
+
+  EXPECT_TRUE(b.GenerateAssignStatement(&assign)) << b.error();
+  EXPECT_FALSE(b.has_error());
+
+  EXPECT_EQ(DumpInstructions(b.types()), R"(%4 = OpTypeFloat 32
+%3 = OpTypeVector %4 3
+%2 = OpTypePointer Output %3
+%1 = OpVariable %2 Output
+%5 = OpTypeInt 32 0
+%6 = OpConstant %5 1
+%7 = OpTypePointer Output %4
+%9 = OpConstant %4 1
+)");
+
+  EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
+            R"(%8 = OpAccessChain %7 %1 %6
+OpStore %8 %9
+)");
+}
+
+TEST_F(BuilderTest, Assign_Vector_MemberByIndex) {
+  ast::type::I32Type i32;
+  ast::type::F32Type f32;
+  ast::type::VectorType vec3(&f32, 3);
+
+  // var[1] = 1
+
+  ast::Variable v("var", ast::StorageClass::kOutput, &vec3);
+
+  auto ident = std::make_unique<ast::ArrayAccessorExpression>(
+      std::make_unique<ast::IdentifierExpression>("var"),
+      std::make_unique<ast::ScalarConstructorExpression>(
+          std::make_unique<ast::IntLiteral>(&i32, 1)));
+  auto val = std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.0f));
+
+  ast::AssignmentStatement assign(std::move(ident), std::move(val));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  td.RegisterVariableForTesting(&v);
+
+  ASSERT_TRUE(td.DetermineResultType(&assign)) << td.error();
+
+  Builder b(&mod);
+  b.push_function(Function{});
+  EXPECT_TRUE(b.GenerateGlobalVariable(&v)) << b.error();
+  ASSERT_FALSE(b.has_error()) << b.error();
+
+  EXPECT_TRUE(b.GenerateAssignStatement(&assign)) << b.error();
+  EXPECT_FALSE(b.has_error());
+
+  EXPECT_EQ(DumpInstructions(b.types()), R"(%4 = OpTypeFloat 32
+%3 = OpTypeVector %4 3
+%2 = OpTypePointer Output %3
+%1 = OpVariable %2 Output
+%5 = OpTypeInt 32 1
+%6 = OpConstant %5 1
+%7 = OpTypePointer Output %4
+%9 = OpConstant %4 1
+)");
+
+  EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
+            R"(%8 = OpAccessChain %7 %1 %6
+OpStore %8 %9
+)");
+}
 
 }  // namespace
 }  // namespace spirv