generator/cpp/gmock_class_test.py

#!/usr/bin/env python
#
# Copyright 2009 Neal Norwitz All Rights Reserved.
# Portions Copyright 2009 Google Inc. All Rights Reserved.
#
# 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.

"""Tests for gmock.scripts.generator.cpp.gmock_class."""

import os
import sys
import unittest

# Allow the cpp imports below to work when run as a standalone script.
sys.path.append(os.path.join(os.path.dirname(__file__), '..'))

from cpp import ast
from cpp import gmock_class


class TestCase(unittest.TestCase):
    """Helper class that adds assert methods."""

    @staticmethod
    def StripLeadingWhitespace(lines):
        """Strip leading whitespace in each line in 'lines'."""
        return '\n'.join([s.lstrip() for s in lines.split('\n')])

    def assertEqualIgnoreLeadingWhitespace(self, expected_lines, lines):
        """Specialized assert that ignores the indent level."""
        self.assertEqual(expected_lines, self.StripLeadingWhitespace(lines))


class GenerateMethodsTest(TestCase):

    @staticmethod
    def GenerateMethodSource(cpp_source):
        """Convert C++ source to Google Mock output source lines."""
        method_source_lines = []
        # <test> is a pseudo-filename, it is not read or written.
        builder = ast.BuilderFromSource(cpp_source, '<test>')
        ast_list = list(builder.Generate())
        gmock_class._GenerateMethods(method_source_lines, cpp_source, ast_list[0])
        return '\n'.join(method_source_lines)

    def testSimpleMethod(self):
        source = """
class Foo {
 public:
  virtual int Bar();
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0(Bar,\nint());',
            self.GenerateMethodSource(source))

    def testSimpleConstructorsAndDestructor(self):
        source = """
class Foo {
 public:
  Foo();
  Foo(int x);
  Foo(const Foo& f);
  Foo(Foo&& f);
  ~Foo();
  virtual int Bar() = 0;
};
"""
        # The constructors and destructor should be ignored.
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0(Bar,\nint());',
            self.GenerateMethodSource(source))

    def testVirtualDestructor(self):
        source = """
class Foo {
 public:
  virtual ~Foo();
  virtual int Bar() = 0;
};
"""
        # The destructor should be ignored.
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0(Bar,\nint());',
            self.GenerateMethodSource(source))

    def testExplicitlyDefaultedConstructorsAndDestructor(self):
        source = """
class Foo {
 public:
  Foo() = default;
  Foo(const Foo& f) = default;
  Foo(Foo&& f) = default;
  ~Foo() = default;
  virtual int Bar() = 0;
};
"""
        # The constructors and destructor should be ignored.
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0(Bar,\nint());',
            self.GenerateMethodSource(source))

    def testExplicitlyDeletedConstructorsAndDestructor(self):
        source = """
class Foo {
 public:
  Foo() = delete;
  Foo(const Foo& f) = delete;
  Foo(Foo&& f) = delete;
  ~Foo() = delete;
  virtual int Bar() = 0;
};
"""
        # The constructors and destructor should be ignored.
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0(Bar,\nint());',
            self.GenerateMethodSource(source))

    def testSimpleOverrideMethod(self):
        source = """
class Foo {
 public:
  int Bar() override;
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0(Bar,\nint());',
            self.GenerateMethodSource(source))

    def testSimpleConstMethod(self):
        source = """
class Foo {
 public:
  virtual void Bar(bool flag) const;
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_CONST_METHOD1(Bar,\nvoid(bool flag));',
            self.GenerateMethodSource(source))

    def testExplicitVoid(self):
        source = """
class Foo {
 public:
  virtual int Bar(void);
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0(Bar,\nint(void));',
            self.GenerateMethodSource(source))

    def testStrangeNewlineInParameter(self):
        source = """
class Foo {
 public:
  virtual void Bar(int
a) = 0;
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD1(Bar,\nvoid(int a));',
            self.GenerateMethodSource(source))

    def testDefaultParameters(self):
        source = """
class Foo {
 public:
  virtual void Bar(int a, char c = 'x') = 0;
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD2(Bar,\nvoid(int a, char c ));',
            self.GenerateMethodSource(source))

    def testMultipleDefaultParameters(self):
        source = """
class Foo {
 public:
  virtual void Bar(
        int a = 42,
        char c = 'x',
        const int* const p = nullptr,
        const std::string& s = "42",
        char tab[] = {'4','2'},
        int const *& rp = aDefaultPointer) = 0;
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            "MOCK_METHOD7(Bar,\n"
            "void(int a , char c , const int* const p , const std::string& s , char tab[] , int const *& rp ));",
            self.GenerateMethodSource(source))

    def testConstDefaultParameter(self):
        source = """
class Test {
 public:
  virtual bool Bar(const int test_arg = 42) = 0;
};
"""
        expected = 'MOCK_METHOD1(Bar,\nbool(const int test_arg ));'
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMethodSource(source))

    def testConstRefDefaultParameter(self):
        source = """
class Test {
 public:
  virtual bool Bar(const std::string& test_arg = "42" ) = 0;
};
"""
        expected = 'MOCK_METHOD1(Bar,\nbool(const std::string& test_arg ));'
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMethodSource(source))

    def testRemovesCommentsWhenDefaultsArePresent(self):
        source = """
class Foo {
 public:
  virtual void Bar(int a = 42 /* a comment */,
                   char /* other comment */ c= 'x') = 0;
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD2(Bar,\nvoid(int a , char c));',
            self.GenerateMethodSource(source))

    def testDoubleSlashCommentsInParameterListAreRemoved(self):
        source = """
class Foo {
 public:
  virtual void Bar(int a,  // inline comments should be elided.
                   int b   // inline comments should be elided.
                   ) const = 0;
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_CONST_METHOD2(Bar,\nvoid(int a, int b));',
            self.GenerateMethodSource(source))

    def testCStyleCommentsInParameterListAreNotRemoved(self):
        # NOTE(nnorwitz): I'm not sure if it's the best behavior to keep these
        # comments.  Also note that C style comments after the last parameter
        # are still elided.
        source = """
class Foo {
 public:
  virtual const string& Bar(int /* keeper */, int b);
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD2(Bar,\nconst string&(int , int b));',
            self.GenerateMethodSource(source))

    def testArgsOfTemplateTypes(self):
        source = """
class Foo {
 public:
  virtual int Bar(const vector<int>& v, map<int, string>* output);
};"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD2(Bar,\n'
            'int(const vector<int>& v, map<int, string>* output));',
            self.GenerateMethodSource(source))

    def testReturnTypeWithOneTemplateArg(self):
        source = """
class Foo {
 public:
  virtual vector<int>* Bar(int n);
};"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD1(Bar,\nvector<int>*(int n));',
            self.GenerateMethodSource(source))

    def testReturnTypeWithManyTemplateArgs(self):
        source = """
class Foo {
 public:
  virtual map<int, string> Bar();
};"""
        # Comparing the comment text is brittle - we'll think of something
        # better in case this gets annoying, but for now let's keep it simple.
        self.assertEqualIgnoreLeadingWhitespace(
            '// The following line won\'t really compile, as the return\n'
            '// type has multiple template arguments.  To fix it, use a\n'
            '// typedef for the return type.\n'
            'MOCK_METHOD0(Bar,\nmap<int, string>());',
            self.GenerateMethodSource(source))

    def testSimpleMethodInTemplatedClass(self):
        source = """
template<class T>
class Foo {
 public:
  virtual int Bar();
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD0_T(Bar,\nint());',
            self.GenerateMethodSource(source))

    def testPointerArgWithoutNames(self):
        source = """
class Foo {
  virtual int Bar(C*);
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD1(Bar,\nint(C*));',
            self.GenerateMethodSource(source))

    def testReferenceArgWithoutNames(self):
        source = """
class Foo {
  virtual int Bar(C&);
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD1(Bar,\nint(C&));',
            self.GenerateMethodSource(source))

    def testArrayArgWithoutNames(self):
        source = """
class Foo {
  virtual int Bar(C[]);
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            'MOCK_METHOD1(Bar,\nint(C[]));',
            self.GenerateMethodSource(source))


class GenerateMocksTest(TestCase):

    @staticmethod
    def GenerateMocks(cpp_source):
        """Convert C++ source to complete Google Mock output source."""
        # <test> is a pseudo-filename, it is not read or written.
        filename = '<test>'
        builder = ast.BuilderFromSource(cpp_source, filename)
        ast_list = list(builder.Generate())
        lines = gmock_class._GenerateMocks(filename, cpp_source, ast_list, None)
        return '\n'.join(lines)

    def testNamespaces(self):
        source = """
namespace Foo {
namespace Bar { class Forward; }
namespace Baz {

class Test {
 public:
  virtual void Foo();
};

}  // namespace Baz
}  // namespace Foo
"""
        expected = """\
namespace Foo {
namespace Baz {

class MockTest : public Test {
public:
MOCK_METHOD0(Foo,
void());
};

}  // namespace Baz
}  // namespace Foo
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testClassWithStorageSpecifierMacro(self):
        source = """
class STORAGE_SPECIFIER Test {
 public:
  virtual void Foo();
};
"""
        expected = """\
class MockTest : public Test {
public:
MOCK_METHOD0(Foo,
void());
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testTemplatedForwardDeclaration(self):
        source = """
template <class T> class Forward;  // Forward declaration should be ignored.
class Test {
 public:
  virtual void Foo();
};
"""
        expected = """\
class MockTest : public Test {
public:
MOCK_METHOD0(Foo,
void());
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testTemplatedClass(self):
        source = """
template <typename S, typename T>
class Test {
 public:
  virtual void Foo();
};
"""
        expected = """\
template <typename T0, typename T1>
class MockTest : public Test<T0, T1> {
public:
MOCK_METHOD0_T(Foo,
void());
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testTemplateInATemplateTypedef(self):
        source = """
class Test {
 public:
  typedef std::vector<std::list<int>> FooType;
  virtual void Bar(const FooType& test_arg);
};
"""
        expected = """\
class MockTest : public Test {
public:
MOCK_METHOD1(Bar,
void(const FooType& test_arg));
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testTemplateInATemplateTypedefWithComma(self):
        source = """
class Test {
 public:
  typedef std::function<void(
      const vector<std::list<int>>&, int> FooType;
  virtual void Bar(const FooType& test_arg);
};
"""
        expected = """\
class MockTest : public Test {
public:
MOCK_METHOD1(Bar,
void(const FooType& test_arg));
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testEnumType(self):
        source = """
class Test {
 public:
  enum Bar {
    BAZ, QUX, QUUX, QUUUX
  };
  virtual void Foo();
};
"""
        expected = """\
class MockTest : public Test {
public:
MOCK_METHOD0(Foo,
void());
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testEnumClassType(self):
        source = """
class Test {
 public:
  enum class Bar {
    BAZ, QUX, QUUX, QUUUX
  };
  virtual void Foo();
};
"""
        expected = """\
class MockTest : public Test {
public:
MOCK_METHOD0(Foo,
void());
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))

    def testStdFunction(self):
        source = """
class Test {
 public:
  Test(std::function<int(std::string)> foo) : foo_(foo) {}

  virtual std::function<int(std::string)> foo();

 private:
  std::function<int(std::string)> foo_;
};
"""
        expected = """\
class MockTest : public Test {
public:
MOCK_METHOD0(foo,
std::function<int (std::string)>());
};
"""
        self.assertEqualIgnoreLeadingWhitespace(
            expected, self.GenerateMocks(source))


if __name__ == '__main__':
    unittest.main()