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Computing with Data

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Rounding Overflow Underflow Comparing Real Numbers The Log-Scale Trick Use of Assembly Language in High-Level Languages

Bash - Introduction Bash - Variables Bash - Pipes Bash - Loops Bash - Conditional Logic Bash - Aliases Command Prompt - Introduction Command Prompt - Variables Command Prompt - Pipes Command Prompt - Loop Command Prompt - Conditional Logic PowerShell - Introduction PowerShell - Pipes PowerShell - Variables PowerShell - Loops PowerShell - Conditional Logic Processes in Linux - Part I Processes in Linux - Part II Processes in Windows Files in Linux Displaying Files Moving, Copying, and Removing Files and Directories Wildcard Characters Soft Links Listing Directory Contents The PATH Environment Variable Compression in Linux Bash Initialization File Script Files Files in Windows Hierarchy of Directories Compression in Windows Users and Permissions in Linux Users and Permissions in Windows Redirecting Input and Output in Linux Redirecting Input and Output in Windows Working on Remote Linux Computers

Compilation Variables Scope Operators Type Conversions References Pointers Arrays Preprocessor and Namespaces - Part I Preprocessor and Namespaces - Part II Strings - Part I Strings - Part II Input - Part I Input - Part II Input - Part III Output If-Else Clauses While-Loops For-Loops - Part I For-Loops - Part II For-Loops - Part III Functions Return Value Function Parameters Function Definition and Function Declaration Scope of Function Variables Pointer Parameters Reference Parameters Recursion - Part I Recursion - Part II Recursion - Part III Recursion - Part IV Passing Arguments to Main Overloading Functions Structs - Part I Structs - Part II Structs - Part III Structs - Part IV Structs - Part V Classes Constructors - Part I Constructors - Part II The Destructor The Copy Constructor The Converting Constructor The Implicit Converting Constructor The Explicit Converting Constructor Operator Overloading Friend Functions and Classes Inheritance Polymorphism Static Binding Virtual Functions Static Variables and Functions - Part I Static Variables and Functions - Part II Dynamic Memory Allocation - Part I Dynamic Memory Allocation - Part II Dynamic Memory Allocation - Part III Smart Pointers - Part I Smart Pointers - Part II Smart Pointers - Part III Template Functions - Part I Template Functions - Part II Template Classes Vectors Arrays Sets Maps - Part I Maps - Part II Unordered Maps

Compilation Types, Variables, and Scope Primitive and Non-Primitive Types Arrays Multidimensional Arrays Ragged Multidimensional Arrays Classpath Strings Functions Classes - Part I Classes - Part II Classes - Part III Inheritance Interfaces Generics ArrayList HashMap

Getting Started Objects Importing Modules Executing Shell Commands Scalar Data Types Strings Duck Typing Tuples Lists Ranges Slicing Sets Dictionaries Counters Dictionaries with Default Values Hashable Objects List Comprehensions Set Comprehensions Dictionary Comprehensions Nested Comprehensions Control Flow The Empty Statement Functions - Part I Functions - Part II Functions - Part III Classes Inheritance The Empty Class The NumPy Package Linear Algebra Random Number Generation The SciPy Package The pandas Package The scikit-learn Package Clustering Classification Regression Reading and Writing Data in Text Format Reading and Writing Ndarrays Reading and Writing Dataframes Material Differences between Python 3 and 2

Getting Started Executing Shell Commands Installing Packages Scope Input and Output Files Scalar Data Types Vectors, Arrays, Lists, and Dataframes The Iris Dataset Functions Conditionals Loops Vectorization Running Compiled Code Interfacing with C Code Modern Interfaces to C Code Customization

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Missing Data in R - Part I Missing Data in R - Part II Missing Data in Python Outliers Skewness and Power Transformation - Part I Skewness and Power Transformation - Part II Binning Indicator Variables Random Sampling, Partitioning, and Shuffling Concatenations and Joins Reshaping Data The Split-Apply-Combine Framework

Thread Safety - Part I Thread Safety - Part II Volatility - Part I Volatility - Part II Synchronization Ineffectual Synchronization - Part I Ineffectual Synchronization - Part II Ineffectual Synchronization - Part III Synchronization vs. Volatility Starvation Deadlocks - Part I Deadlocks - Part II Deadlocks - Part II The Producer-Consumer Problem - Part I The Producer-Consumer Problem - Part II The Producer-Consumer Problem - Part III The Producer-Consumer Problem - Part IV The Producer-Consumer Problem - Part V The Producer-Consumer Problem - Part VI Reader-Writer Locks - Part I Reader-Writer Locks - Part II Reader-Writer Locks - Part III Reader-Writer Locks - Part IV Reentrant Locks - Part I Reentrant Locks - Part II Reentrant Locks - Part III Reentrant Locks - Part IV Thread Pools - Part I Thread Pools - Part II Thread Pools - Part III Scheduled Executor Services Futures Streams ParSeq - Part I ParSeq - Part II ParSeq - Part III ParSeq - Part IV File Locks Distributed Locks Linearizable Counters

White-Box Testing Gray-Box Testing Black-Box Testing Mocking EasyMock Test Hooks - Part I Test Hooks - Part II Dealing with Randomness - Part I Dealing with Randomness - Part II Test Case Anatomy - Part I Test Case Anatomy - Part II Data-Driven Testing

Git Subversion Ant Exceptions Handling Exceptions - Part I Handling Exceptions - Part II Handling Exceptions - Part III Handling Exceptions - Part III Docstrings Debugging

JSON Serialization Pickling Shelving Java Object Serialization Accessing HDF from Python using PyTables Working with Databases

Partitioning Retry Policies Amazon DynamoDB - Part I Amazon DynamoDB - Part II Amazon DynamoDB - Part III Amazon DynamoDB - Part IV Amazon DynamoDB - Part V Amazon DynamoDB - Part VI

Previous: Test Case Anatomy - Part I Next: Data-Driven Testing

Test Case Anatomy - Part II

Here's an example that makes use of the setUp method to create a new instance of the key-value store in a clean state for each test case:

import unittest
class KeyValueStore(object):
  ''' A key-value store example '''
  def __init__(self):
    self._store = {}
  def put(self, key, value):
    ''' Puts a value in the store '''
    self._store[key] = value
  def get(self, key):
    ''' Gets a value from the store by its key '''
    return self._store.get(key)
class TestKeyValueStore(unittest.TestCase):
  ''' A unit test for KeyValueStore '''
  def setUp(self):
    ''' Runs before each test method '''
    self.store = KeyValueStore()
  def test_init(self):
    ''' Tests __init__ '''
    self.assertEqual(self.store.get('key'), None)
    self.assertEqual(len(self.store._store), 0)
  def test_put_with_value(self):
    ''' Tests put '''
    self.store.put('key', 'value')
    self.assertEqual(self.store.get('key'), 'value')
    self.assertEqual(len(self.store._store), 1)
  def test_put_with_none_value(self):
    ''' Tests put with none value '''
    self.store.put('key', None)
    self.assertEqual(self.store.get('key'), None)
    self.assertEqual(len(self.store._store), 1)
if __name__ == '__main__':
  unittest.main()

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