diff --git a/tests/test_configspec.py b/tests/test_configspec.py
new file mode 100644
index 0000000..f0fa1ec
--- /dev/null
+++ b/tests/test_configspec.py
@@ -0,0 +1,103 @@
+import pytest
+import configspec
+
+# Test each def type, both pass and fail
+
+
+@pytest.fixture
+def example_spec():
+    confspec = configspec.ConfigSpecification()
+    confspec.add_spec("bool_a",
+                      configspec.BoolSpec(False, False, "Bool A"))
+    confspec.add_spec("boollist_a",
+                      configspec.BoolListSpec(False, False, "Bool A"))
+    confspec.add_spec("int_a",
+                      configspec.IntSpec(0, -4, 4, False, "Int A"))
+    confspec.add_spec("intlist_a",
+                      configspec.IntListSpec(0, -4, 4, False, "Int A"))
+    confspec.add_spec("string_a",
+                      configspec.StringSpec("ThisIsAString", 4, 15, False, "String A"))
+    confspec.add_spec("stringlist_a",
+                      configspec.StringListSpec("ThisIsAString", 4, 15, False, "String A"))
+
+    confdictspec = confspec.add_spec("dict_a",
+                                     configspec.DictSpec(None, False, "Dict A"))
+    confdictspec.add_spec("bool_b",
+                          configspec.BoolSpec(False, False, "Bool B"))
+    confdictspec.add_spec("int_b",
+                          configspec.IntSpec(0, -4, 4, False, "Int B"))
+    confdictspec.add_spec("string_b",
+                          configspec.StringSpec("ThisIsAString", 4, 15, False, "String B"))
+
+    confdictlist = confspec.add_spec("dictlist_a",
+                                     configspec.DictListSpec(None, False, "List of Dicts B"))
+    confdictlist.add_spec("bool_c",
+                          configspec.BoolSpec(False, False, "Bool C"))
+    confdictlist.add_spec("int_c",
+                          configspec.IntSpec(0, -4, 4, False, "Int C"))
+    confdictlist.add_spec("string_c",
+                          configspec.StringSpec("ThisIsAString", 4, 15, False, "String C"))
+
+    return confspec
+
+
+@pytest.fixture
+def example_values():
+    vals = {'bool_a': True,
+            'boollist_a': [False, True],
+            'int_a': 1,
+            'intlist_a': [1, 2, 3, 4],
+            'string_a': 'sometext',
+            'stringlist_a': ['somemoretext', 'yetmoretext'],
+            'dict_a': {
+                'bool_b': False,
+                'int_b': 0,
+                'string_b': 'texttesttext'},
+            'dictlist_a': [{'bool_c': False,
+                            'int_c': 0,
+                            'string_c': 'string1'},
+                           {'bool_c': False,
+                            'int_c': 0,
+                            'string_c': 'string2'}]}
+
+    return vals
+
+
+def test_config_validate(example_spec, example_values):
+    spec = example_spec
+    spec.validate(example_values)
+
+
+def test_invalid_bool():
+    spec = configspec.BoolSpec()
+    with pytest.raises(configspec.InvalidConfigError, match="value must be a boolean"):
+        spec.validate("false")
+    with pytest.raises(configspec.InvalidConfigError, match="value must be a boolean"):
+        spec.validate(None)
+
+
+def test_invalid_int():
+    spec = configspec.IntSpec(minval=-4, maxval=4)
+    with pytest.raises(configspec.InvalidConfigError, match="value must be >="):
+        spec.validate(-5)
+    with pytest.raises(configspec.InvalidConfigError, match="value must be <="):
+        spec.validate(5)
+    with pytest.raises(configspec.InvalidConfigError, match="value must be an integer"):
+        spec.validate("5")
+    with pytest.raises(configspec.InvalidConfigError, match="value must be an integer"):
+        spec.validate(None)
+
+
+def test_invalid_string():
+    spec = configspec.StringSpec(minlength=4, maxlength=15)
+    with pytest.raises(configspec.InvalidConfigError, match="string length must be >="):
+        spec.validate("123")
+    with pytest.raises(configspec.InvalidConfigError, match="string length must be <="):
+        spec.validate("1234567890abcdef")
+    with pytest.raises(configspec.InvalidConfigError, match="value must be a string"):
+        spec.validate(1)
+    with pytest.raises(configspec.InvalidConfigError, match="value must be a string"):
+        spec.validate(None)
+
+
+# Test manager, load, overlay, freeze