Unable to retrieve Environment variables in Unit Test for Cake extension

[nick5454]

I'm running a Unit Test for a cake extension. And i'm trying to retrieve a local environment variable, but it's not working. Do I need to just fake the variable and this will work when ran in the build pipeline?

This returns null

var home = context.Environment.GetEnvironmentVariable("JAVA_HOME");

[devlead]

Hard to answer without seeing code, but generally when testing something like Cake.Testing / NSubstitute is used.

NSubstitute example here

cake/src/Cake.Common.Tests/Fixtures/Build/GitHubActionsInfoFixture.cs

Lines 19 to 26 in d454dc2

	Environment = Substitute.For<ICakeEnvironment>();
	Environment.GetEnvironmentVariable("GITHUB_ACTIONS").Returns("true");
	Environment.GetEnvironmentVariable("HOME").Returns("/home/runner");
	Environment.GetEnvironmentVariable("RUNNER_NAME").Returns("RunnerName");
	Environment.GetEnvironmentVariable("RUNNER_OS").Returns("Linux");
	Environment.GetEnvironmentVariable("RUNNER_TEMP").Returns("/home/runner/work/_temp");

[nick5454]

@devlead Thanks! I'm testing the ENV vars to know whether Java exists on the machine. If it doesn't then I need to download and install. And set the Env var JAVA_HOME. Can you suggest the best way to achieve this?

I'm assuming since I have the download url. I can download it and then unzip it and install via silent mode. Or is there a better way?

[devlead]

JAVA_HOME is one way, another way would be to try to resolve java executable.

I.e. something like

Context.Tools.Resolve("java.exe") ?? Context.Tools.Resolve("java")

Which is the way most Cake tool resolution is done by default i.e.

cake/src/Cake.Common/Tools/DotNet/DotNetTool.cs

Line 51 in d454dc2

return new[] { "dotnet", "dotnet.exe" };

[nick5454]

@devlead Will that automatically download the Java executable if it doesn't exist on the machine?

The issue I have is that in order for the SDKManager with Android to work, the JAVA_HOME environment variable has to be pointed to the folder where it was installed. But on a clean Release MS Hosted pipeline does not have android or Java installed

My basic path is
Download then install the JDK
create JAVA_HOME and point it to the correct folder
Download Android Command Tools to a folder ( JAVA_HOME must be pointing to the correct folder )
run the tool and install the needed SDK's

Is there an example of doing that? I'm looking at Cake.AndroidSDKManager and he's using an http call to grab the installation file and executing.

I assumed that's what I should do or is this wrong?