diff --git a/packages/wyatt_form_bloc/test/form_input_test.dart b/packages/wyatt_form_bloc/test/form_input_test.dart
new file mode 100644
index 00000000..3c567ab3
--- /dev/null
+++ b/packages/wyatt_form_bloc/test/form_input_test.dart
@@ -0,0 +1,79 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:wyatt_form_bloc/wyatt_form_bloc.dart';
+
+void main() {
+  group('FormInput', () {
+    test('contains key', () {
+      final input = FormInput<String?, Name, void>('key', const Name.pure());
+      expect(input.key, 'key');
+    });
+
+    test('contains validator', () {
+      final input = FormInput<String?, Name, void>('key', const Name.pure());
+      expect(input.validator, const Name.pure());
+    });
+
+    test('contains metadata', () {
+      final input = FormInput<String?, Name, int>(
+        'key',
+        const Name.pure(),
+        metadata: const FormInputMetadata<int>(
+          extra: 42,
+        ),
+      );
+      expect(input.metadata.extra, 42);
+    });
+
+    test('== to another form input', () {
+      final input1 = FormInput<String?, Name, void>(
+        'key',
+        const Name.pure(),
+        metadata: const FormInputMetadata<int>(
+          extra: 42,
+        ),
+      );
+      final input2 = FormInput<String?, Name, void>(
+        'key',
+        const Name.pure(),
+        metadata: const FormInputMetadata<int>(
+          extra: 42,
+        ),
+      );
+      expect(input1 == input2, isTrue);
+    });
+
+    test('!= to a different form input', () {
+      final input1 = FormInput<String?, Name, void>(
+        'key',
+        const Name.pure(),
+        metadata: const FormInputMetadata<int>(
+          extra: 43, // little difference here
+        ),
+      );
+      final input2 = FormInput<String?, Name, void>(
+        'key',
+        const Name.pure(),
+        metadata: const FormInputMetadata<int>(
+          extra: 42,
+        ),
+      );
+      expect(input1 == input2, isFalse);
+    });
+  });
+}
diff --git a/packages/wyatt_form_bloc/test/form_input_validator_test.dart b/packages/wyatt_form_bloc/test/form_input_validator_test.dart
new file mode 100644
index 00000000..e7abbf91
--- /dev/null
+++ b/packages/wyatt_form_bloc/test/form_input_validator_test.dart
@@ -0,0 +1,158 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:wyatt_form_bloc/wyatt_form_bloc.dart';
+
+void main() {
+  group('FormInputValidator', () {
+    group('Boolean', () {
+      test('is pure at the beginning', () {
+        const validator = Boolean.pure();
+        expect(validator.pure, true);
+      });
+
+      test('contains `false` at the beginning', () {
+        const validator = Boolean.pure();
+        expect(validator.pure, true);
+        expect(validator.value, false);
+      });
+
+      test('contains `true` when intialized with', () {
+        const validator = Boolean.pure(defaultValue: true);
+        expect(validator.pure, true);
+        expect(validator.value, true);
+      });
+
+      test('returns ValidationStandardError.invalid on null', () {
+        const validator = Boolean.dirty();
+        expect(validator.error, ValidationStandardError.invalid);
+      });
+
+      test('is invalid and contains `null` when update with `null`', () {
+        const validator = Boolean.dirty();
+        expect(validator.invalid, true);
+        expect(validator.value, null);
+      });
+
+      test('is valid and contains `true` when update with `true`', () {
+        const validator = Boolean.dirty(value: true);
+        expect(validator.valid, true);
+        expect(validator.value, true);
+      });
+
+      test('is valid and contains `false` when update with `false`', () {
+        const validator = Boolean.dirty(value: false);
+        expect(validator.valid, true);
+        expect(validator.value, false);
+      });
+
+      test('== to another boolean validator with the same attributes', () {
+        const validator1 = Boolean.dirty(value: false);
+        const validator2 = Boolean.dirty(value: false);
+        expect(validator1 == validator2, isTrue);
+      });
+
+      test('!= to another boolean validator with different attributes', () {
+        const validator1 = Boolean.dirty(value: false);
+        const validator2 = Boolean.dirty(value: true);
+        expect(validator1 == validator2, isFalse);
+      });
+    });
+
+    group('ConfirmedPassword', () {
+      test('is pure at the beginning', () {
+        const validator = ConfirmedPassword.pure();
+        expect(validator.pure, true);
+      });
+
+      test('contains `null` at the beginning', () {
+        const validator = ConfirmedPassword.pure();
+        expect(validator.pure, true);
+        expect(validator.value, null);
+      });
+
+      test('contains `pwd` when intialized with', () {
+        const validator = ConfirmedPassword.pure(defaultValue: 'pwd');
+        expect(validator.pure, true);
+        expect(validator.value, 'pwd');
+      });
+
+      test('returns ValidationStandardError.invalid on null', () {
+        const validator = ConfirmedPassword.dirty(password: 'pwd');
+        expect(validator.error, ValidationStandardError.invalid);
+      });
+
+      test('returns ValidationStandardError.notEqual on different values', () {
+        const validator =
+            ConfirmedPassword.dirty(password: 'pwd', value: 'incorrect');
+        expect(validator.error, ValidationStandardError.notEqual);
+      });
+
+      test('is invalid and contains `null` when update with `null`', () {
+        const validator = ConfirmedPassword.dirty(password: 'pwd');
+        expect(validator.invalid, true);
+        expect(validator.value, null);
+      });
+
+      test('is invalid and contains `incorrect` when update with `incorrect`',
+          () {
+        const validator =
+            ConfirmedPassword.dirty(password: 'pwd', value: 'incorrect');
+        expect(validator.invalid, true);
+        expect(validator.value, 'incorrect');
+      });
+
+      test('is valid and contains `pwd` when update with `pwd`', () {
+        const validator =
+            ConfirmedPassword.dirty(password: 'pwd', value: 'pwd');
+        expect(validator.valid, true);
+        expect(validator.value, 'pwd');
+      });
+
+      test(
+          '== to another confirmed password validator with the same attributes',
+          () {
+        const validator1 =
+            ConfirmedPassword.dirty(password: 'pwd', value: 'pwd');
+        const validator2 =
+            ConfirmedPassword.dirty(password: 'pwd', value: 'pwd');
+        expect(validator1 == validator2, isTrue);
+      });
+
+      test(
+          '!= to another confirmed password validator '
+          'with different attributes', () {
+        const validator1 =
+            ConfirmedPassword.dirty(password: 'pwd', value: 'pwd1');
+        const validator2 =
+            ConfirmedPassword.dirty(password: 'pwd', value: 'pwd2');
+        expect(validator1 == validator2, isFalse);
+      });
+
+      test('!= to another confirmed password validator with different password',
+          () {
+        const validator1 =
+            ConfirmedPassword.dirty(password: 'pwd1', value: 'pwd');
+        const validator2 =
+            ConfirmedPassword.dirty(password: 'pwd2', value: 'pwd');
+        expect(validator1 == validator2, isFalse);
+      });
+    });
+  });
+
+  // TODO(hpcl): add tests for all validators...
+}
diff --git a/packages/wyatt_form_bloc/test/form_operation_test.dart b/packages/wyatt_form_bloc/test/form_operation_test.dart
new file mode 100644
index 00000000..825374b1
--- /dev/null
+++ b/packages/wyatt_form_bloc/test/form_operation_test.dart
@@ -0,0 +1,144 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:wyatt_form_bloc/wyatt_form_bloc.dart';
+
+void main() {
+  final WyattForm formA = WyattFormImpl(
+    [
+      FormInput(
+        'email',
+        const Email.dirty('test@test.fr'),
+      ),
+      FormInput(
+        'password',
+        const Password.pure(),
+      ),
+    ],
+    name: 'A',
+  );
+
+  final WyattForm formB = WyattFormImpl(
+    [
+      FormInput(
+        'email',
+        const Email.dirty('test2@test.fr'),
+      ),
+      FormInput(
+        'password',
+        const Password.dirty('password1234'),
+      ),
+      FormInput(
+        'bool',
+        const Boolean.pure(),
+      ),
+      FormInput(
+        'phone',
+        const Phone.dirty('0000000000'),
+      ),
+    ],
+    name: 'B',
+  );
+
+  group('FormReplace', () {
+    test('returns B when called on (A,B)', () {
+      final result = const FormReplace().call(formA, formB);
+      expect(result, formB);
+    });
+  });
+
+  group('FormUnion', () {
+    final WyattForm union = WyattFormImpl(
+      [
+        FormInput(
+          'email',
+          const Email.dirty('test@test.fr'),
+        ),
+        FormInput(
+          'password',
+          const Password.dirty('password1234'),
+        ),
+        FormInput(
+          'bool',
+          const Boolean.pure(),
+        ),
+        FormInput(
+          'phone',
+          const Phone.dirty('0000000000'),
+        ),
+      ],
+      name: 'A',
+    );
+
+    test('returns A union B when called on (A,B), with A name', () {
+      final result = const FormUnion().call(formA, formB);
+      expect(result, union);
+    });
+  });
+
+  group('FormIntersection', () {
+    final WyattForm intersection = WyattFormImpl(
+      [
+        FormInput(
+          'email',
+          const Email.dirty('test@test.fr'),
+        ),
+        FormInput(
+          'password',
+          const Password.dirty('password1234'),
+        ),
+      ],
+      name: 'A',
+    );
+
+    test('returns A intersection B when called on (A,B), with A name', () {
+      final result = const FormIntersection().call(formA, formB);
+      expect(result, intersection);
+    });
+  });
+
+  group('FormDifference', () {
+    test('returns A - B when called on (A,B), with A name', () {
+      final result = const FormDifference().call(formA, formB);
+      expect(
+        result,
+        WyattFormImpl(
+          const [],
+          name: 'A',
+        ),
+      );
+    });
+    final WyattForm difference = WyattFormImpl(
+      [
+        FormInput(
+          'bool',
+          const Boolean.pure(),
+        ),
+        FormInput(
+          'phone',
+          const Phone.dirty('0000000000'),
+        ),
+      ],
+      name: 'B',
+    );
+
+    test('returns B - A when called on (B,A), with B name', () {
+      final result = const FormDifference().call(formB, formA);
+      expect(result, difference);
+    });
+  });
+}
diff --git a/packages/wyatt_form_bloc/test/wyatt_form_bloc_test.dart b/packages/wyatt_form_bloc/test/wyatt_form_bloc_test.dart
deleted file mode 100644
index e69de29b..00000000
diff --git a/packages/wyatt_form_bloc/test/wyatt_form_test.dart b/packages/wyatt_form_bloc/test/wyatt_form_test.dart
new file mode 100644
index 00000000..f927df6b
--- /dev/null
+++ b/packages/wyatt_form_bloc/test/wyatt_form_test.dart
@@ -0,0 +1,167 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:wyatt_form_bloc/wyatt_form_bloc.dart';
+
+void main() {
+  group('WyattForm', () {
+    final WyattForm form = WyattFormImpl(
+      [
+        FormInput(
+          'email',
+          const Email.pure(),
+        ),
+        FormInput(
+          'password',
+          const Password.pure(),
+        ),
+      ],
+      name: 'signInForm',
+    );
+
+    test('returns inputs', () {
+      final inputs = <
+          FormInput<dynamic, FormInputValidator<dynamic, ValidationError>,
+              dynamic>>[
+        FormInput(
+          'email',
+          const Email.pure(),
+        ),
+        FormInput(
+          'password',
+          const Password.pure(),
+        ),
+      ];
+
+      expect(form.inputs, inputs);
+    });
+
+    test('returns validation strategy', () {
+      final strategy = form.formValidationStrategy;
+      expect(strategy, const EveryInputValidator());
+    });
+
+    test('returns validator list', () {
+      final validators = [
+        const Email.pure(),
+        const Password.pure(),
+      ];
+      expect(form.asValidatorList<dynamic, ValidationError>(), validators);
+    });
+
+    test('returns name', () {
+      final name = form.name;
+      expect(name, 'signInForm');
+    });
+
+    group('containsKey', () {
+      test('returns `true` on key `email`', () {
+        expect(form.containsKey('email'), true);
+      });
+
+      test('returns `true` on key `password`', () {
+        expect(form.containsKey('password'), true);
+      });
+
+      test('return `false` on key `incorrect`', () {
+        expect(form.containsKey('incorrect'), false);
+      });
+    });
+
+    group('inputOf', () {
+      test('returns email input', () {
+        final input = FormInput<dynamic,
+            FormInputValidator<dynamic, ValidationError>, dynamic>(
+          'email',
+          const Email.pure(),
+        );
+
+        expect(form.inputOf('email'), input);
+      });
+
+      test('returns password input', () {
+        final input = FormInput<dynamic,
+            FormInputValidator<dynamic, ValidationError>, dynamic>(
+          'password',
+          const Password.pure(),
+        );
+
+        expect(form.inputOf('password'), input);
+      });
+
+      test('throw on unknown key', () {
+        expect(() => form.inputOf('incorrect'), throwsException);
+      });
+    });
+
+    group('errorOf', () {
+      final WyattForm errorForm = WyattFormImpl(
+        [
+          FormInput(
+            'email',
+            const Email.dirty('incorrect'),
+          ),
+          FormInput(
+            'password',
+            const Password.dirty('toto1234'),
+          ),
+        ],
+        name: 'signInForm',
+      );
+
+      test('returns `invalid` on invalid input', () {
+        expect(errorForm.errorOf('email'), ValidationStandardError.invalid);
+      });
+
+      test('returns `null` on valid input', () {
+        expect(errorForm.errorOf('password'), isNull);
+      });
+    });
+
+    group('errorOf', () {
+      final WyattForm metadataForm = WyattFormImpl(
+        [
+          FormInput(
+            'email',
+            const Email.pure(),
+            metadata: const FormInputMetadata<int>(
+              extra: 1,
+            ),
+          ),
+          FormInput(
+            'password',
+            const Password.pure(),
+            metadata: const FormInputMetadata<int>(
+              extra: 2,
+            ),
+          ),
+        ],
+        name: 'signInForm',
+      );
+
+      test('returns `1` on email extra', () {
+        expect(metadataForm.metadataOf<int>('email').extra, 1);
+      });
+
+      test('returns `2` on password extra', () {
+        expect(metadataForm.metadataOf<int>('password').extra, 2);
+      });
+    });
+  });
+
+  // TODO(hpcl): add more tests on WyattForm
+}