Adding some shape to toolchain semantic analysis (#1092)

toolchain/semantics/semantics_ir_factory_test.cpp

@@ -0,0 +1,56 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include "toolchain/semantics/semantics_ir_factory.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <optional>
+
+#include "toolchain/diagnostics/mocks.h"
+#include "toolchain/lexer/tokenized_buffer.h"
+#include "toolchain/parser/parse_tree.h"
+#include "toolchain/source/source_buffer.h"
+
+namespace Carbon::Testing {
+namespace {
+
+using ::testing::_;
+
+class SemanticsIRFactoryTest : public ::testing::Test {
+ protected:
+  auto Analyze(llvm::Twine t) -> SemanticsIR {
+    source_buffer.emplace(std::move(*SourceBuffer::CreateFromText(t.str())));
+    tokenized_buffer = TokenizedBuffer::Lex(*source_buffer, consumer);
+    EXPECT_FALSE(tokenized_buffer->has_errors());
+    parse_tree = ParseTree::Parse(*tokenized_buffer, consumer);
+    EXPECT_FALSE(parse_tree->has_errors());
+    return SemanticsIRFactory::Build(*parse_tree);
+  }
+
+  std::optional<SourceBuffer> source_buffer;
+  std::optional<TokenizedBuffer> tokenized_buffer;
+  std::optional<ParseTree> parse_tree;
+  MockDiagnosticConsumer consumer;
+};
+
+TEST_F(SemanticsIRFactoryTest, Empty) {
+  EXPECT_CALL(consumer, HandleDiagnostic(_)).Times(0);
+  Analyze("");
+}
+
+TEST_F(SemanticsIRFactoryTest, FunctionBasic) {
+  EXPECT_CALL(consumer, HandleDiagnostic(_)).Times(0);
+  Analyze("fn Foo() {}");
+}
+
+TEST_F(SemanticsIRFactoryTest, FunctionDuplicate) {
+  Analyze(R"(fn Foo() {}
+             fn Foo() {}
+            )");
+}
+
+}  // namespace
+}  // namespace Carbon::Testing