diff --git a/school_library/decorators/trimmer_decorator.rb b/school_library/decorators/trimmer_decorator.rb
index c7a0657..e9476b1 100644
--- a/school_library/decorators/trimmer_decorator.rb
+++ b/school_library/decorators/trimmer_decorator.rb
@@ -3,6 +3,6 @@
 class TrimmerDecorator < Decorator
   def correct_name
     name = @nameable.correct_name
-    name.length > 10 ? name[0..9] : name
+    name[0..9]
   end
 end
diff --git a/school_library/library/student.rb b/school_library/library/student.rb
index 77d20c9..3972cb9 100644
--- a/school_library/library/student.rb
+++ b/school_library/library/student.rb
@@ -2,6 +2,7 @@
 
 class Student < Person
   attr_accessor :classroom
+  attr_reader :parent_permission
 
   def initialize(age, name: 'Unknown', parent_permission: true)
     super(generate_random_id, name: name, age: age, parent_permission: parent_permission)
diff --git a/school_library/library/teacher.rb b/school_library/library/teacher.rb
index ddb447a..02c972b 100644
--- a/school_library/library/teacher.rb
+++ b/school_library/library/teacher.rb
@@ -10,7 +10,7 @@ def can_use_services?
     true
   end
 
-  attr_reader :specialization
+  attr_reader :specialization, :parent_permission
 
   private
 
diff --git a/school_library/modules/create_books.rb b/school_library/modules/create_books.rb
index 6cf17e7..f297c55 100644
--- a/school_library/modules/create_books.rb
+++ b/school_library/modules/create_books.rb
@@ -1,4 +1,3 @@
-# create_book.rb
 require_relative '../library/person'
 require_relative '../models/book'
 require_relative '../models/rental'
diff --git a/school_library/modules/create_rentals.rb b/school_library/modules/create_rentals.rb
index 67f4048..7cfa304 100644
--- a/school_library/modules/create_rentals.rb
+++ b/school_library/modules/create_rentals.rb
@@ -1,5 +1,3 @@
-# create_rentals.rb
-
 require_relative '../library/person'
 require_relative '../models/book'
 require_relative '../models/rental'
diff --git a/spec/book_spec.rb b/spec/book_spec.rb
new file mode 100644
index 0000000..395df0c
--- /dev/null
+++ b/spec/book_spec.rb
@@ -0,0 +1,33 @@
+require_relative '../school_library/models/book'
+
+describe Book do
+  before :each do
+    @book = Book.new('My Book', 'Jane Doe')
+  end
+
+  describe '#new' do
+    it 'takes two parameters and returns a Book object' do
+      expect(@book).to be_an_instance_of Book
+    end
+  end
+
+  describe '#title' do
+    it 'returns the correct title' do
+      expect(@book.title).to eql 'My Book'
+    end
+  end
+
+  describe '#author' do
+    it 'returns the correct author' do
+      expect(@book.author).to eql 'Jane Doe'
+    end
+  end
+
+  describe '#add_rental' do
+    it 'adds a rental to the rentals array' do
+      rental = double('Rental')
+      @book.add_rental(rental)
+      expect(@book.rentals).to include(rental)
+    end
+  end
+end
diff --git a/spec/classroom_spec.rb b/spec/classroom_spec.rb
new file mode 100644
index 0000000..868d2a2
--- /dev/null
+++ b/spec/classroom_spec.rb
@@ -0,0 +1,28 @@
+require_relative '../school_library/models/classroom'
+require_relative '../school_library/library/student'
+
+describe Classroom do
+  before :each do
+    @my_classroom = Classroom.new('7E Upper')
+  end
+
+  describe '#new' do
+    it 'creates a Classroom instance given the label' do
+      expect(@my_classroom).to be_an_instance_of Classroom
+    end
+  end
+
+  describe '#label' do
+    it 'returns the correct label' do
+      @my_classroom.label.should eql '7E Upper'
+    end
+  end
+
+  describe 'Add Student'
+  it 'accepts new student' do
+    my_student = Student.new(10, name: 'Jane')
+    @my_classroom.add_student(my_student)
+    expect(@my_classroom.students.include?(my_student)).to eql true
+    expect(@my_classroom.students[0].name).to eql 'Jane'
+  end
+end
diff --git a/spec/decorator_spec.rb b/spec/decorator_spec.rb
new file mode 100644
index 0000000..810188f
--- /dev/null
+++ b/spec/decorator_spec.rb
@@ -0,0 +1,23 @@
+require_relative '../school_library/decorators/capitalize_decorator'
+require_relative '../school_library/decorators/trimmer_decorator'
+require_relative '../school_library/library/person'
+
+describe CapitalizeDecorator do
+  describe '#should capitalize the name' do
+    it 'should capitalize the name' do
+      person = Person.new(1, name: 'maximilianus', age: 25)
+      capitalized = CapitalizeDecorator.new(person)
+      expect(capitalized.correct_name).to eql 'Maximilianus'
+    end
+  end
+end
+
+describe TrimmerDecorator do
+  describe '#should trim the name' do
+    it 'should trim the name' do
+      person = Person.new(1, name: 'maximilianus', age: 25)
+      trimmed = TrimmerDecorator.new(person).correct_name
+      expect(trimmed).to eql 'maximilian'
+    end
+  end
+end
diff --git a/spec/person_spec.rb b/spec/person_spec.rb
new file mode 100644
index 0000000..345bc69
--- /dev/null
+++ b/spec/person_spec.rb
@@ -0,0 +1,83 @@
+require_relative '../school_library/decorators/nameable'
+require_relative '../school_library/library/person'
+
+describe Person do
+  let(:person) { Person.new(1, name: 'Unknown', age: 25, parent_permission: true) }
+
+  describe '#initialize' do
+    it 'takes three parameters and returns a Person object' do
+      expect(person).to be_an_instance_of Person
+    end
+
+    it 'should assign the correct id' do
+      expect(person.id).to eql 1
+    end
+
+    it 'should assign the correct name' do
+      expect(person.name).to eql 'Unknown'
+    end
+
+    it 'should assign the correct age' do
+      expect(person.age).to eql 25
+    end
+
+    it 'should assign the correct parent_permission' do
+      expect(person.instance_variable_get(:@parent_permission)).to eql true
+    end
+
+    it 'should initialize an empty rentals array' do
+      expect(person.rentals).to be_empty
+    end
+  end
+
+  describe '#of_age?' do
+    it 'returns true if age is 18 or older' do
+      person.age = 20
+      expect(person.send(:of_age?)).to be true
+    end
+
+    it 'returns false if age is under 18' do
+      person.age = 16
+      expect(person.send(:of_age?)).to be false
+    end
+  end
+
+  describe '#can_use_services?' do
+    it 'returns true if the person is of age' do
+      person.age = 20
+      expect(person.can_use_services?).to be true
+    end
+
+    it 'returns true if parent permission is granted' do
+      person.age = 16
+      person.instance_variable_set(:@parent_permission, true)
+      expect(person.can_use_services?).to be true
+    end
+
+    it 'returns false if neither of age nor parent permission' do
+      person.age = 16
+      person.instance_variable_set(:@parent_permission, false)
+      expect(person.can_use_services?).to be false
+    end
+  end
+
+  describe '#correct_name' do
+    it 'returns the correct name' do
+      expect(person.correct_name).to eql 'Unknown'
+    end
+  end
+
+  describe '#add_rental' do
+    it 'adds a rental to the rentals array' do
+      rental = double('Rental')
+      person.add_rental(rental)
+      expect(person.rentals).to include(rental)
+    end
+  end
+
+  describe 'when name is not provided' do
+    it 'defaults to "Unknown"' do
+      expect(person.name).to eql 'Unknown'
+    end
+  end
+end
diff --git a/spec/rental_spec.rb b/spec/rental_spec.rb
new file mode 100644
index 0000000..ffe14c9
--- /dev/null
+++ b/spec/rental_spec.rb
@@ -0,0 +1,37 @@
+require_relative '../school_library/models/rental'
+require_relative '../school_library/models/book'
+require_relative '../school_library/library/student'
+
+describe Rental do
+  before :each do
+    my_book = Book.new('My Book', 'Jane Doe')
+    my_person = Student.new(22, name: 'Rose', parent_permission: true)
+    @rental = Rental.new('1/1/2024', my_book, my_person)
+  end
+
+  describe '#new' do
+    it 'takes three parameters and returns a Rental object' do
+      expect(@rental).to be_an_instance_of Rental
+    end
+  end
+
+  describe '#date' do
+    it 'returns the correct rental date' do
+      expect(@rental.date).to eql '1/1/2024'
+    end
+  end
+
+  describe '#person' do
+    it 'assigns the correct person to the rental' do
+      expect(@rental.person.name).to eql 'Rose'
+      expect(@rental.person.age).to eql 22
+    end
+  end
+
+  describe '#book' do
+    it 'assigns the correct book to the rental' do
+      expect(@rental.book.title).to eql 'My Book'
+      expect(@rental.book.author).to eql 'Jane Doe'
+    end
+  end
+end
diff --git a/spec/student_spec.rb b/spec/student_spec.rb
new file mode 100644
index 0000000..eba06c9
--- /dev/null
+++ b/spec/student_spec.rb
@@ -0,0 +1,44 @@
+require_relative '../school_library/library/student'
+
+describe Student do
+  before :each do
+    @student = Student.new(25)
+    @student_without_permission = Student.new(16, name: 'Alice', parent_permission: false)
+    @student_with_name = Student.new(25, name: 'John')
+  end
+
+  describe '#initialize' do
+    it 'takes two parameters and returns a Student object' do
+      expect(@student).to be_an_instance_of Student
+    end
+    it 'should assign the correct name' do
+      expect(@student.name).to eql 'Unknown'
+    end
+    it 'should assign the correct age' do
+      expect(@student.age).to eql 25
+    end
+    it 'should assign the correct parent_permission' do
+      expect(@student.parent_permission).to eql true
+    end
+    it 'should override the default parent_permission' do
+      expect(@student_without_permission.parent_permission).to eql false
+    end
+    it 'should override the default name' do
+      expect(@student_with_name.name).to eql 'John'
+    end
+  end
+
+  describe '#assign_classroom' do
+    it 'assigns the correct classroom' do
+      my_classroom = Classroom.new('7E Upper')
+      @student.assign_to_classroom(my_classroom)
+      expect(@student.classroom.label).to eql '7E Upper'
+    end
+  end
+
+  describe '#play_hooky' do
+    it 'returns the correct message' do
+      expect(@student.play_hooky).to eql '¯(ツ)/¯'
+    end
+  end
+end
diff --git a/spec/teacher_spec.rb b/spec/teacher_spec.rb
new file mode 100644
index 0000000..32be803
--- /dev/null
+++ b/spec/teacher_spec.rb
@@ -0,0 +1,40 @@
+require_relative '../school_library/library/teacher'
+
+describe Teacher do
+  before :each do
+    @teacher = Teacher.new('Math')
+  end
+
+  describe '#initialize' do
+    it 'takes two parameters and returns a Teacher object' do
+      expect(@teacher).to be_an_instance_of Teacher
+    end
+    it 'should assign the correct name' do
+      expect(@teacher.name).to eql 'Unknown'
+    end
+    it 'should assign the correct age' do
+      expect(@teacher.age).to eql nil
+    end
+    it 'should assign the correct specialization' do
+      expect(@teacher.specialization).to eql 'Math'
+    end
+    it 'should override the default name' do
+      @teacher_with_name = Teacher.new('Math', name: 'John')
+      expect(@teacher_with_name.name).to eql 'John'
+    end
+    it 'should override the default age' do
+      @teacher_with_age = Teacher.new('Math', age: 25)
+      expect(@teacher_with_age.age).to eql 25
+    end
+    it 'should override the default permission' do
+      @teacher_with_permission = Teacher.new('Math', age: 25, parent_permission: true)
+      expect(@teacher_with_permission.parent_permission).to eql true
+    end
+  end
+
+  describe '#can_use_services?' do
+    it 'returns true' do
+      expect(@teacher.can_use_services?).to eql true
+    end
+  end
+end