- Integration test are written to check how pieces of code will react when interfaced with other lines of code and or hardware.
- Integration test solves the problem of uncertainty when code or components are added together to work in its more intended purpose.
- The difference between bottom up and top down testing is bottom up starts by testing the smallest portions of the code working up to the more complex as with top down it starts with the most complex to the least.
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- Why do we write integration tests?
- To combine the program units and test as them as groups in diff way.
- What problems do integration tests solve?
- Integration testing can expose problems with the interfaces among program components before trouble occurs in real-world program execution.
- What are the differences between top-down and bottom-down approaches?
- Bottom-up integration testing begins with unit testing, followed by tests of of progressively higher-level combinations of units called modules or builds. In top-down integration testing, the highest-level modules are tested first and progressively lower-level modules are tested after that.
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- 2.To test the interaction through selected interfaces(languages) between several unit codes
- Top-down start from the test with most units of codes available in, while bottom-up starts the test with the minimum unit of code
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To make sure that all parts/units of the code work together.
It solves problems with the interfaces among parts/units before a bug occurs in real-world usage.
The top-down approach starts with testing the entire application and then work down to smaller parts/units.
The bottom-up approach begins with testing each individual parts/units and then work to bigger and bigger parts/units.
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Why do we write integration tests?
In order to expose problems with interfaces with program components to avoid problems later. -
What problems do integration tests solve?
By verifying component integration you can catch bugs early that will save development time. -
What are the differences between top-down and bottom-down approaches?
Bottom-up starts with unit level then gradually reaches the entire application interface. Top down starts with the highest level, then gradually gets down to the component and unit level testing.
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Why do we write integration tests? In order to identify potential problems with the software before getting to a real world scenario.
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What problems do integration tests solve? Integration tests aim to solve the type of issues that could encounter in customers computers, systems and networks.
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What are the differences between top-down and bottom-down approaches? Top -down testing is the testing of the system as a whole first followed by progressively smaller modules being tested. Bottom-up testing is simply the inverse of that, which is to say the testing of the smaller units being tested first and progressively testing the larger modules.
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- We are attempting to identify problems with the interfaces of the program components before the program is deployed.
- It ensures the program functions as envisioned and intended.
- Itâs in the directionality of testing: âBottom-Upâ begins with âUnit Testingâ of each component as the higher-levels are developed. âTop-Downâ starts from the higher level progressively downwards.
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1] To expose problems with interfaces among components prior to real-world execution
2] Problems in the interactions between various components of the code
3] Top-down tests the code against the overall design specifications whereas bottom-up tests individual components of the overall code
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Why do we write integration tests?
So that we can test program units as groups in multiple ways -
What problems do integration tests solve?
They can expose problems with the interface among program components before trouble occurs in real-world program execution -
What are the differences between top-down and bottom-up approaches?
Modules are organized from high to low level. Development usually starts with bottom-up testing of program units, then top-down, and also hybrid testing in both directions.
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@ivan Hey Ivan, I assume that in question 3, you mean âbottom-upâ instead of âbottom-downâ. 
1. Integration tests are done to eliminate issues with interfaces of different software components. Components of a software do not only interact with each other, but also with the environment the application is executed in (e.g. a customerâs device). Both of these aspects are addressed with integration tests.
2. Integration tests can find and solve problems with the interfaces (or interaction) of different software modules. Thus, problems are solved before they can occur in a real world environment or the final product.
3. In integration testing, the top-down approach usually follows after the bottom-up approach. In the bottom-up approach, individual units are tested first, before moving on to higher level modules or builds. The top-down approach means that these higher level modules, basically a combination of units, comes before moving down the ladder to the lower level, individual units.
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1- To check if different components/units of the code work together
2- Bugs problems with interfaces and errors.
3- Top-down : You start with main functions and progressively lower-level modules are tested after.
Bottom-up: You start with unit testing and progressively higher level tests.
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Why do we write integration tests?
To make sure the entire set of software code written for a project works well together, completely, and to the business requirements and design specs. -
What problems do integration tests solve?
The interaction between different software modules that cannot be tested solely in unit tests. -
What are the differences between top-down and bottom-down approaches?
Top-down integrated testing is all encompassing. It is the testing of the entire product or service to ensure all new and existing features work together as intended, reliably, and with with no errors. Bottom-up integrated testing is the testing of specific functionality such as an individual feature in a product, an API, a transaction etc. where multiple areas of the product or service are being impacted.
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Q.1 - Why do we write integration tests ?
A.1 - Integration testing is done to test the modules/components when integrated to verify that they work as expected.
Q.2 - What problems do integration tests solve ?
A.2 - $ This testing makes sure that the integrated modules/components work properly. $ Integration testing can be started once the modules to be tested are available. $ It detects the errors related to the interface.
Q.3 - What are the differences between top-down and bottom-down approaches ?
A.3 - Top down approach begins with high level design and ends with low level design or development. Whereas, bottom up approach begins with low level design or development and ends with high level design.
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- To expose problems with the interfaces among program components before trouble occurs in real-world program execution.
2.They identify problems with the way program components interact with each other.
- The bottom-up process starts with unit testing followed by progressively higher level tests of combinations of units otherwise known as modules or builds. In top-down integration testing, the highest-level modules are tested first and then progressively lower-level modules ones.
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Why do we write integration tests?
To check if the app or program is running as a whole and to find bugs before the software is shipped to the clients/public. -
What problems do integration tests solve?
Finds errors before the app/program is used in âreal lifeâ. Tests all systems and subsystems to see how they are working individually -
What are the differences between top-down and bottom-down approaches?
âbottom-downâ is a paradox, is like when the oil closed on negative prices :)) âŚfix the typo guys
Bottom-up starts with unit testing and progresses to higher level combination of units (modules, builds)
Top down is the opposite, higher level modules are tested then lower and lower ones. Top down should be done after bottom up is performed.
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- Integration Tests are written in order to combine Program Units and test them to check if they are properly functioning. It is a method used to expose problems with the application before having it available for users.
- Thanks to this method it is possible to identify and analyze all the issues related to how Program Units interact and work together.
- The difference is in approach and perspective. In the top-down approach, the testing process is carried out by starting on top (High level modules) and then moving down (to Low level modules), while in the bottom-up approach the process occurs in the opposite way (starting with Low level modules and reaching High level ones).
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We need integration tests because we need to test the interaction between the individual modules/function/methods. Although with the unit testing approach it is ensured that every function/modules is working as it should be, it is not proven and very likely that within the interaction/ communication between the individuals modules mistakes occurs. So we have to test the single modules as a group with the scope of identifying mistakes in the interaction between each other.
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As I said before integration testing should discover bugs/mistakes within the interaction of the individual modules/function/methods. It should ensure that before the application goes live or is revealed to the public every bug/mistake is found and solved.
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In the bottom up approach you start testing every small piece of code which can be tested and check whether its behaviour/output is correct or not. After ensuring that everything works well you test the interaction between the individual functions/method together. This approach is more elaborate and have higher costs in the beginning, but the probability that a mistakes occurs is very small. It is also easier and faster to find a mistake.
Within the top down approach you test your application or big modules at first. And after this you check the smaller modules. You will get a prototype faster but it is more elaborate to find and solve a mistake.
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1.We write Integration testing because it can expose problems with the [interfaces] among program components before trouble occurs in real-world program execution.
2.It can detect errors, evaluate the correctness of behavior and performance of the software application.
3.In top-down integration testing, the highest-level modules are tested first and progressively lower-level modules are tested after that. Bottom-up integration testing begins with [unit testing], followed by tests of of progressively higher-level combinations of units called modules or builds. In top-down integration testing, the highest-level modules are tested first and progressively lower-level modules are tested after that.
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To test code effectively as groups in multiple ways.
2.
Helps with continual testing and revision.
3.
In Bottom-up first unit test happening, than progressively higher-level combinations of units are tested.
In Top down the highest-level modules are tested first, than progressively lower-level modules being tested.
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¡ Why do we write integration tests?
Integration testing is done to test the modules/components when integrated to verify that they work as expected i.e. to test the modules which are working fine individually does not have issues when integrated.
¡ What problems do integration tests solve?
One potential problem is the difficulty of localizing defects to the correct part once the parts have been integrated.
A second potential problem is inadequate, built-in test software that could help locate the cause of any failed test.
Finally, a third problem is the potential lack of availability of the correct (versions of the) parts to integrate
.¡ What are the differences between top-down and bottom-down approaches?
Top-down approach decomposes the large task into smaller subtasks whereas bottom-up approach first chooses to solve the different fundamental parts of the task directly then combine those parts into a whole program.
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