diff --git a/src/playtest2/steps/core.py b/src/playtest2/steps/core.py
index ed8938c..9306bf8 100644
--- a/src/playtest2/steps/core.py
+++ b/src/playtest2/steps/core.py
@@ -10,11 +10,50 @@ def assert_string_value(expected: str):
 @step("整数値の<expected>である")
 def assert_int_value(expected: str):
     actual = data_store.spec.pop("actual")
-    expected = int(expected)
-    assert actual == expected, f"Expected {expected!r} but got {actual!r}"  # noqa: S101
+    expected_int = int(expected)
+    assert actual == expected_int, f"Expected {expected_int!r} but got {actual!r}"  # noqa: S101
 
 
 @step("真である")
 def assert_true_value():
     actual = data_store.spec.pop("actual")
     assert actual is True, f"Expected True but got {actual!r}"  # noqa: S101
+
+
+@step("文字列の<expected>を含んでいる")
+def assert_string_contains(expected: str):
+    actual = data_store.spec.pop("actual")
+    assert expected in actual, f"Expected {actual!r} to contain {expected!r}"  # noqa: S101
+
+
+@step("小数値の<expected>である")
+def assert_float_value(expected: str):
+    actual = data_store.spec.pop("actual")
+    expected_float = float(expected)
+    assert actual == expected_float, f"Expected {expected_float!r} but got {actual!r}"  # noqa: S101
+
+
+@step("整数値の<expected>以上である")
+def assert_int_greater_equal(expected: str):
+    actual = data_store.spec.pop("actual")
+    expected_int = int(expected)
+    assert actual >= expected_int, f"Expected {actual!r} to be >= {expected_int!r}"  # noqa: S101
+
+
+@step("偽である")
+def assert_false_value():
+    actual = data_store.spec.pop("actual")
+    assert actual is False, f"Expected False but got {actual!r}"  # noqa: S101
+
+
+@step("真偽値の<expected>である")
+def assert_bool_value(expected: str):
+    actual = data_store.spec.pop("actual")
+    expected_bool = expected == "True"
+    assert actual == expected_bool, f"Expected {expected_bool!r} but got {actual!r}"  # noqa: S101
+
+
+@step("nullである")
+def assert_null_value():
+    actual = data_store.spec.pop("actual")
+    assert actual is None, f"Expected None but got {actual!r}"  # noqa: S101
diff --git a/tests/steps/test_core.py b/tests/steps/test_core.py
index fbce643..9575d06 100644
--- a/tests/steps/test_core.py
+++ b/tests/steps/test_core.py
@@ -64,3 +64,149 @@ def test_assert_true_value_fail():
         core_steps.assert_true_value()
 
     assert "actual" not in data_store.spec
+
+
+def test_assert_string_contains_pass():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = "hello world"
+
+    core_steps.assert_string_contains("world")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_string_contains_fail():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = "hello world"
+
+    with pytest.raises(AssertionError):
+        core_steps.assert_string_contains("python")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_float_value_pass():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = 3.14
+
+    core_steps.assert_float_value("3.14")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_float_value_fail():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = 3.14
+
+    with pytest.raises(AssertionError):
+        core_steps.assert_float_value("2.71")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_int_greater_equal_pass():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = 42
+
+    core_steps.assert_int_greater_equal("40")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_int_greater_equal_equal_pass():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = 42
+
+    core_steps.assert_int_greater_equal("42")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_int_greater_equal_fail():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = 42
+
+    with pytest.raises(AssertionError):
+        core_steps.assert_int_greater_equal("50")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_false_value_pass():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = False
+
+    core_steps.assert_false_value()
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_false_value_fail():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = True
+
+    with pytest.raises(AssertionError):
+        core_steps.assert_false_value()
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_bool_value_pass_true():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = True
+
+    core_steps.assert_bool_value("True")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_bool_value_pass_false():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = False
+
+    core_steps.assert_bool_value("False")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_bool_value_fail():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = True
+
+    with pytest.raises(AssertionError):
+        core_steps.assert_bool_value("False")
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_null_value_pass():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = None
+
+    core_steps.assert_null_value()
+
+    assert "actual" not in data_store.spec
+
+
+def test_assert_null_value_fail():
+    from getgauge.python import data_store
+
+    data_store.spec["actual"] = "not null"
+
+    with pytest.raises(AssertionError):
+        core_steps.assert_null_value()
+
+    assert "actual" not in data_store.spec