Code signing is required for product type 'Application' in SDK 'iOS 10.2'

You will get this error if the Unit Test Target sets code signing

to "Do not code sign" (Like Image 01). This could happen if your  “Provisional Profile” differs with the source control’s (ex. Bitbucket).  You can solve this error by following some easy steps, which are given below.

Image 01 Code signing Error

Step # 1

First of all, change your project’s target to project’s test target from Navigator area of XCode. (Image 02)

Image 02 Changing project's target

Step # 2

Then select “Building Settings” from top bar and find a settings option named “Signing” (Image 03).  After that you can notice "Code Signing Identity" sets to “Don't Code Sign”. 

Image 03 Searching the "Signing" in "Building Settings"

Step # 3

Change  this “Don't Code Sign” to any of your profile. In Image 04 you can see I have selected “iOS Developer”. 

Image 04 Change the code signing profile

Build your project. It should be error free now. But if you are still getting another error called “Siging for “project_nameTests” requires a development team. Select a development team in the project editor.”  That means your project’s Test target needs to be assigned to a developer team.

Like Image 05, first select “General”. In that screen you can see the previous mentioned error. Just select the developer team from the list. Again build your project successfully.

Image 05 Changing the team from General