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F# Compiler, Core Library and Visual F# Tools Tests

Prerequisites

In order to run the FSharpQA suite, you will need to install Perl (ActiveState Perl 5.16.3 is known to work fine). Perl must be included in the %PATH% for the below steps to work. It is also recommended that you run tests from an elevated command prompt, as there are a couple of test cases which require administrative privileges.

The Perl requirement is gradually being removed.

Quick start: Running Tests

To run tests, use variations such as the following, depending on which test suite and build configuration you want:

build.cmd compiler,smoke
build.cmd compiler
build.cmd ci
build.cmd all
build.cmd debug,compiler
build.cmd debug,ci
build.cmd debug,all

Default is ci

  • ci = the build and tests done by continuous integration
  • compiler = build the compiler
  • compiler,smoke = build the compiler and run some smoke tests
  • debug = use Debug configuration instead of Release
  • pcls = build and test the Portable PCL libraries for FSharp.Core
  • build_only = build, don't test
  • all = build and test everything

Test Suites

The F# tests are split as follows:

  • FSharp Suite - Older suite with broad coverage of mainline compiler and runtime scenarios.

  • FSharpQA Suite - Broad and deep coverage of a variety of compiler, runtime, and syntax scenarios.

  • FSharp.Core.Unittests - Validation of the core F# types and the public surface area of FSharp.Core.dll.

  • FSharp.Compiler.Unittests - Validation of compiler internals.

  • VisualFSharp.UnitTests - Visual F# Tools IDE Unit Test Suite This suite exercises a wide range of behaviors in the F# Visual Studio project system and language service.

More Details

FSharp Suite

This is now compiled using [tests\fsharp\FSharp.Tests.fsproj] to a unit test DLL which acts as a driver script.

This compiles and executes the test.fsx file using some combination of compiler or FSI flags.
If the compilation and execution encounter no errors, the test is considered to have passed.

FSharpQA Suite

These tests require use of the RunAll.pl framework to execute. Test area directories in this suite will contain a number of source code files and a single env.lst file. The env.lst file defines a series of test cases, one per line.
Test cases will run an optional "pre command," compile some set of source files using some set of flags, optionally run the resulting binary, then optionally run a final "post command." If all of these steps complete without issue, the test is considered to have passed.

FSharp.Compiler.Unittests, FSharp.Core.Unittests, VisualFSharp.Unittests

These are all NUnit tests. You can execute these tests individually via the Visual Studio NUnit3 runner extension or the command line via nunit3-console.exe.

Note that for compatibility reasons, the IDE unit tests should be run in a 32-bit process, using the '--x86' flag to nunit3-console.exe

RunTests.cmd

The script tests\RunTests.cmd is used to execute the suites. It's used like this:

RunTests.cmd <debug|release> fsharp [tags to run] [tags not to run]
RunTests.cmd <debug|release> fsharpqa [tags to run] [tags not to run]
RunTests.cmd <debug|release> compilerunit
RunTests.cmd <debug|release> coreunit
RunTests.cmd <debug|release> coreunitportable47
RunTests.cmd <debug|release> coreunitportable7
RunTests.cmd <debug|release> coreunitportable78
RunTests.cmd <debug|release> coreunitportable259
RunTests.cmd <debug|release> ideunit

RunTests.cmd sets a handful of environment variables which allow for the tests to work, then puts together and executes the appropriate command line to start the specified test suite.

All test execution logs and result files will be dropped into the tests\TestResults folder, and have file names matching FSharp_*.*, FSharpQA_*.*, CompilerUnit_*.*, CoreUnit_*.*, IDEUnit_*.*, e.g. FSharpQA_Results.log or FSharp_Failures.log.

For the FSharp and FSharpQA suites, the list of test areas and their associated "tags" is stored at

tests\test.lst                   // FSharp suite
tests\fsharpqa\source\test.lst   // FSharpQA suite

Tags are in the left column, paths to to corresponding test folders are in the right column. If no tags are specified to RunTests.cmd, all tests will be run.

If you want to re-run a particular test area, the easiest way to do so is to set a temporary tag for that area in test.lst (e.g. "RERUN"), then call RunTests.cmd <debug|release> <fsharp|fsharpqa> RERUN.

If you want to specify multiple tags to run or not run, pass them comma-delimited and enclosed in double quotes, e.g. RunTests.cmd debug fsharp "Core01,Core02". From a Powershell environment, make sure the double quotes are passed literally, e.g. .\RunTests.cmd debug fsharp '"Core01,Core02"' or .\RunTests.cmd --% debug fsharp "Core01,Core02".

RunTests.cmd is mostly just a simple wrapper over tests\fsharpqa\testenv\bin\RunAll.pl, which has capabilities not discussed here. More advanced test execution scenarios can be achieved by invoking RunAll.pl directly.
Run perl tests\fsharpqa\testenv\bin\RunAll.pl -? to see a full list of flags and options.

Other Tips

  • Run as Administrator, or a handful of tests will fail

  • Making the tests run faster

    • NGen-ing the F# bits (fsc, fsi, FSharp.Core, etc) will result in tests executing much faster. Make sure you run src\update.cmd with the -ngen flag before running tests.
    • The FSharp and FSharpQA suites will run test cases in parallel by default. You can comment out the relevant line in RunTests.cmd (look for PARALLEL_ARG) to disable this.
    • By default, tests from the FSharpQA suite are run using a persistent, hosted version of the compiler. This speeds up test execution, as there is no need for the fsc.exe process to spin up repeatedly. To disable this, uncomment the relevant line in RunTests.cmd (look for HOSTED_COMPILER).