metrics.md

Test Smells

Metric	Description
Assertion Roulette	This smell comes from having a number of assertions in a test method that have no explanation; thus, if an assertion fails, the identification of the assert that failed can be difficult
Eager Test	A test is affected by Eager Test when it checks more than one method of the class to be tested, making the comprehension of the actual test target difficult
Lazy Test	A test is affected by this smell when several methods check the same method using the same fixture
Mystery Guest	Arises when a test uses external resources (e.g., file containing test data), and thus it is not self contained
Sensitive Equality	A test is affected by a Sensitive Equality smell when an assertion contains an equality checks through the use of the toString method
Resource Optimism	Tests affected by such smell make assumptions about the state or the existence of external resources, providing a non-deterministic result that depends on the state of the resources

Code Quality Metrics

Metric	Description
LOC	Indicates the lines of code of a given class
HALSTEAD	Halstead metric give a sense of how complex the individual lines of code (or statements) are
RFC	Counts the number of unique method invocations in a class. As invocations are resolved via static analysis, this implementation fails when a method has overloads with same number of parameters, but different types
CBO	This metric indicates the dependency degree of a class by another one
MPC	MPC is the total number of function and procedure calls made to external unit
IFC	(Information Flow Complex Metric) It provides a measure of the information that flows between the various modules in a system
DAC	DAC (Data Abstraction Coupling) is defined as “the number of abstract data types (ADTs) defined in a class”
DAC2	DAC2 is a variant of the classic Data Abstraction Coupling that counts the number of distinct data type defined in a class
LCOM1	LCOM1counts the number of pairs of methods that do not share attributes
LCOM2	LCOM2 is defined as LCOM1 minus number of pairs of methods that use common attribute.
LCOM3	It is the number of connected components in graph. To compute LCOM3 each method represented as a node and the use of at least one attribute as an edge
LCOM4	It is similar to LCOM3, To represent method invocation additional edges are used.
CONNECTIVITY	It is a cohesion metric based on the interactions between source code methods
LCOM5	LCOM5 = (a – kl) / (l – kl), where l is the number of attributes, k is the number of methods, and a is the summation of the number of distinct attributes accessed by each method in a class
COH	Is defined as COH = a / kl, where a, k and l have the same definition as above
TCC	TCC is defined as the percentage of pairs of public methods of the class with common attribute usage.
LCC	LCC defines the relative number of directly or indirectly connected pairs of methods
ICH	Number of invocations of other methods of the same class, weighted by the number of parameters of the invoked method
WMC	This is a complexity metric introduced by Chidamber and Kemerer. The WMC metric is the sum of the complexities of all class methods
NOA	The Number Of Attributes metric is used to count the average number of attributes for a class in the model
NOPA	NOPA (Number of Public Attributes) is the number of public attributes of a class
NOP	The Number Of Packages metric counts the packages within the analyzed software system
McCabe	It measures the number of linearly independent paths contained in the control flow of the program
BUSEWEIMER	It is a predictive model that look at structural features, e.g. number of parenthesis in a statement, to measure the readability of a source code component

Code Smells

Metric	Description
CDSBP	(Class Data Should Be Private) A class exposing its fields, violating the principle of data hiding
CC	CC (Complex Class) describes a class exposing its fields, violating the principle of data hiding
Blob	A large class implementing different responsibilities and centralizing most of the system processing
SC	(Spaghetti Code) a class implementing complex methods interacting between them, with no parameters, using global variables
MC	(Message Chain) A long chain of method invocations is performed to implement a class functionality
LM	(Long Method) A method that is unduly long in terms of lines of code
FE	(Feature Envy) A method is more interested in a class other than the one it actually is in
FD	(Functional Decomposition) A class where inheritance and polymorphism are poorly used, declaring many private fields and implementing few methods

Coverage

Metric	Description
line coverage	Line coverage reports on the execution footprint of testing in terms of which lines of code were executed to complete the test

Readability

Metric	Description
readability	Expresses the probability associated to a class to be readable in the range from 0 to 1, where 1 means that the classifier is sure that the class is readable