Update BuildToolTests.testBuildCompleteMessage

[yim-lee]

Motivation:
The build output on Linux has changed. Causing self hosted Linux test to fail (example):

21:29:49 Test Case 'BuildToolTests.testBuildCompleteMessage' started at 2021-05-13 04:29:06.495
21:29:49
/home/buildnode/jenkins/workspace/swift-package-manager-self-hosted-Linux-smoke-test/branch-main/swiftpm/Tests/CommandsTests/BuildToolTests.swift:256: error: BuildToolTests.testBuildCompleteMessage : XCTAssertTrue failed - [1/4] Compiling Bar Bar.swift
21:29:49 [3/6] Merging module Bar
21:29:49 [5/7] Wrapping AST for Bar for debugging
21:29:49 [6/9] Compiling Foo Foo.swift
21:29:49 [7/9] Compiling Foo main.swift
21:29:49 [9/11] Merging module Foo
21:29:49 [11/12] Wrapping AST for Foo for debugging
21:29:49 [12/12] Linking Foo
21:29:49 [12/12] Build complete!
21:29:49
21:29:49 Test Case 'BuildToolTests.testBuildCompleteMessage' failed (5.24 seconds)

Modification:
Update expected output in BuildToolTests.testBuildCompleteMessage.

[yim-lee]

@swift-ci please smoke test

[yim-lee]

@swift-ci please smoke test

[tomerd]

@yim-lee potentially we can just replace this with a regex as the x/x part is not important. wdyt?

e.g.

XCTAssertMatch(result.stdout, .regex("\\[[0-9]+\\/[0-9]+\\] Build complete!"))

[yim-lee]

potentially we can just replace this with a regex as the x/x part is not important. wdyt?

Sure. I don't know if the actual number might indicate when there is a problem though?

As in, is the fact that the number has changed from 8 to 12 an indication of a problem?

[yim-lee]

With d9135e5, Linux self hosted passes but Linux smoke test fails.

Taking my change out and running with the original code (9366d3e) Linux self hosted fails, which confirms the code changes in #3495 aren't causing the failure.

[tomerd]

As in, is the fact that the number has changed from 8 to 12 an indication of a problem?

it just means the driver/compiler computed more steps which is fine. I think a regex would be better / more future facing

[yim-lee]

@swift-ci please smoke test

[yim-lee]

@swift-ci please smoke test macOS