Source verbose from -test.v for cacheable runs.

[hpidcock]

It is unfortunate that results of go test -check.v are not cached in the go test cache. This is due to -check.v not being in the small set of test arguments that can be cached (see go test help below). This PR seeks to allow this by consuming the test.v flag when enabling verbosity in check test runs.

Since -test.v and the other cache-safe arguments are a part of the hash used to lookup the cache, it is safe for us to alter the behaviour of check to print the verbose output (as this is cached separately to a test result without verbosity).

go help test

The rule for a match in the cache is that the run involves the same
test binary and the flags on the command line come entirely from a
restricted set of 'cacheable' test flags, defined as -benchtime, -cpu,
-list, -parallel, -run, -short, -timeout, -failfast, and -v.
If a run of go test has any test or non-test flags outside this set,
the result is not cached.

[hpidcock]

Example:

$ go test ./... -v
=== RUN   Test
PASS: benchmark_test.go:18: BenchmarkS.TestBasicTestTiming	0.002s
PASS: benchmark_test.go:39: BenchmarkS.TestBenchmark	0.023s
PASS: benchmark_test.go:62: BenchmarkS.TestBenchmarkBytes	0.022s
PASS: benchmark_test.go:77: BenchmarkS.TestBenchmarkMem	0.022s
PASS: benchmark_test.go:15: BenchmarkS.TestCountSuite	0.000s
PASS: benchmark_test.go:29: BenchmarkS.TestStreamTestTiming	0.002s
PASS: bootstrap_test.go:26: BootstrapS.TestCountSuite	0.000s
PASS: bootstrap_test.go:29: BootstrapS.TestFailedAndFail	0.000s
PASS: bootstrap_test.go:40: BootstrapS.TestFailedAndSucceed	0.000s
PASS: bootstrap_test.go:48: BootstrapS.TestLogAndGetTestLog	0.000s
PASS: bootstrap_test.go:56: BootstrapS.TestLogfAndGetTestLog	0.000s
PASS: foundation_test.go:299: BootstrapS.TestMinLogger	0.000s
PASS: bootstrap_test.go:74: BootstrapS.TestRunDoesntShowSuccesses	0.000s
PASS: bootstrap_test.go:64: BootstrapS.TestRunShowsErrors	0.000s
PASS: checkers_test.go:39: CheckersS.TestComment	0.000s
PASS: checkers_test.go:120: CheckersS.TestDeepEquals	0.000s
PASS: checkers_test.go:88: CheckersS.TestEquals	0.000s
PASS: checkers_test.go:165: CheckersS.TestErrorMatches	0.000s
PASS: checkers_test.go:254: CheckersS.TestFitsTypeOf	0.000s
PASS: checkers_test.go:154: CheckersS.TestHasLen	0.000s
PASS: checkers_test.go:277: CheckersS.TestImplements	0.000s
PASS: checkers_test.go:47: CheckersS.TestIsNil	0.000s
PASS: checkers_test.go:179: CheckersS.TestMatches	0.000s
PASS: checkers_test.go:76: CheckersS.TestNot	0.000s
PASS: checkers_test.go:62: CheckersS.TestNotNil	0.000s
PASS: checkers_test.go:229: CheckersS.TestPanicMatches	0.000s
PASS: checkers_test.go:199: CheckersS.TestPanics	0.000s
PASS: fixture_test.go:17: FixtureS.TestCountSuite	0.000s
PASS: fixture_test.go:355: FixtureS.TestFixtureDoesntRunWithoutTests	0.000s
PASS: fixture_test.go:447: FixtureS.TestFixtureLogging	0.000s
PASS: fixture_test.go:23: FixtureS.TestOrder	0.001s
PASS: fixture_test.go:129: FixtureS.TestPanicOnSetUpSuite	0.000s
PASS: fixture_test.go:68: FixtureS.TestPanicOnSetUpTest	0.001s
PASS: fixture_test.go:152: FixtureS.TestPanicOnTearDownSuite	0.001s
PASS: fixture_test.go:98: FixtureS.TestPanicOnTearDownTest	0.001s
PASS: fixture_test.go:40: FixtureS.TestPanicOnTest	0.001s
PASS: fixture_test.go:222: FixtureS.TestPanicOnWrongSetUpSuiteArg	0.000s
PASS: fixture_test.go:279: FixtureS.TestPanicOnWrongSetUpSuiteArgCount	0.000s
PASS: fixture_test.go:206: FixtureS.TestPanicOnWrongSetUpTestArg	0.000s
PASS: fixture_test.go:263: FixtureS.TestPanicOnWrongSetUpTestArgCount	0.000s
PASS: fixture_test.go:184: FixtureS.TestPanicOnWrongTestArg	0.001s
PASS: fixture_test.go:241: FixtureS.TestPanicOnWrongTestArgCount	0.001s
PASS: fixture_test.go:409: FixtureS.TestSetUpSuiteAssert	0.002s
PASS: fixture_test.go:394: FixtureS.TestSetUpSuiteCheck	0.001s
PASS: fixture_test.go:461: FixtureS.TestSkipSuite	0.000s
PASS: fixture_test.go:472: FixtureS.TestSkipTest	0.001s
PASS: foundation_test.go:171: FoundationS.TestCallerLoggingInDifferentFile	0.001s
PASS: foundation_test.go:154: FoundationS.TestCallerLoggingInsideTest	0.001s
PASS: foundation_test.go:26: FoundationS.TestCountSuite	0.000s
PASS: foundation_test.go:48: FoundationS.TestError	0.001s
PASS: foundation_test.go:29: FoundationS.TestErrorf	0.001s
PASS: foundation_test.go:207: FoundationS.TestExpectFailureFail	0.000s
PASS: foundation_test.go:229: FoundationS.TestExpectFailureSucceed	0.001s
PASS: foundation_test.go:238: FoundationS.TestExpectFailureSucceedVerbose	0.001s
PASS: foundation_test.go:62: FoundationS.TestFailNow	0.000s
PASS: foundation_test.go:93: FoundationS.TestFailureHeader	0.000s
PASS: foundation_test.go:110: FoundationS.TestFatal	0.001s
PASS: foundation_test.go:132: FoundationS.TestFatalf	0.001s
PASS: foundation_test.go:267: FoundationS.TestSkip	0.000s
PASS: foundation_test.go:277: FoundationS.TestSkipVerbose	0.000s
PASS: foundation_test.go:78: FoundationS.TestSucceedNow	0.000s
PASS: foundation_test.go:324: EmbeddedS.TestCountSuite	0.000s
PASS: foundation_test.go:331: EmbeddedS.TestMethod	0.000s
PASS: helpers_test.go:245: HelpersS.TestAssertFailWithExpected	0.003s
PASS: helpers_test.go:258: HelpersS.TestAssertFailWithExpectedAndMessage	0.003s
PASS: helpers_test.go:272: HelpersS.TestAssertFailWithoutExpected	0.003s
PASS: helpers_test.go:284: HelpersS.TestAssertFailWithoutExpectedAndMessage	0.002s
PASS: helpers_test.go:223: HelpersS.TestAssertSucceedWithExpected	0.000s
PASS: helpers_test.go:234: HelpersS.TestAssertSucceedWithoutExpected	0.000s
PASS: helpers_test.go:311: HelpersS.TestAssertWithError	0.003s
PASS: helpers_test.go:297: HelpersS.TestAssertWithMissingExpected	0.002s
PASS: helpers_test.go:325: HelpersS.TestAssertWithNilChecker	0.001s
PASS: helpers_test.go:96: HelpersS.TestCheckFailWithExpected	0.001s
PASS: helpers_test.go:108: HelpersS.TestCheckFailWithExpectedAndComment	0.001s
PASS: helpers_test.go:121: HelpersS.TestCheckFailWithExpectedAndStaticComment	0.002s
PASS: helpers_test.go:135: HelpersS.TestCheckFailWithoutExpected	0.003s
PASS: helpers_test.go:146: HelpersS.TestCheckFailWithoutExpectedAndMessage	0.003s
PASS: helpers_test.go:76: HelpersS.TestCheckSucceedWithExpected	0.000s
PASS: helpers_test.go:86: HelpersS.TestCheckSucceedWithoutExpected	0.000s
PASS: helpers_test.go:184: HelpersS.TestCheckWithError	0.003s
PASS: helpers_test.go:158: HelpersS.TestCheckWithMissingExpected	0.003s
PASS: helpers_test.go:197: HelpersS.TestCheckWithNilChecker	0.003s
PASS: helpers_test.go:208: HelpersS.TestCheckWithParamsAndNamesMutation	0.002s
PASS: helpers_test.go:171: HelpersS.TestCheckWithTooManyExpected	0.001s
PASS: helpers_test.go:67: HelpersS.TestCheckerInterface	0.000s
PASS: helpers_test.go:435: HelpersS.TestConcurrentLogging	0.001s
PASS: helpers_test.go:19: HelpersS.TestCountSuite	0.000s
PASS: helpers_test.go:411: HelpersS.TestMkDir	0.001s
PASS: helpers_test.go:470: HelpersS.TestTestName	0.000s
PASS: helpers_test.go:340: HelpersS.TestValueLoggingWithArrays	0.001s
PASS: helpers_test.go:352: HelpersS.TestValueLoggingWithMultiLine	0.002s
PASS: helpers_test.go:369: HelpersS.TestValueLoggingWithMultiLineException	0.001s
PASS: integration_test.go:38: integrationS.TestOutput	0.001s
PASS: printer_test.go:12: PrinterS.TestCountSuite	0.000s
PASS: printer_test.go:98: PrinterS.TestIndent	0.000s
PASS: printer_test.go:79: PrinterS.TestPrintLine	0.004s
PASS: reporter_test.go:23: reporterS.TestWrite	0.000s
PASS: reporter_test.go:60: reporterS.TestWriteCallProblemWithStreamFlag	0.000s
PASS: reporter_test.go:73: reporterS.TestWriteCallProblemWithoutStreamFlag	0.000s
PASS: reporter_test.go:89: reporterS.TestWriteCallProblemWithoutStreamFlagWithLog	0.000s
PASS: reporter_test.go:35: reporterS.TestWriteCallStartedWithStreamFlag	0.000s
PASS: reporter_test.go:48: reporterS.TestWriteCallStartedWithoutStreamFlag	0.000s
PASS: reporter_test.go:107: reporterS.TestWriteCallSuccessWithStreamFlag	0.000s
PASS: reporter_test.go:120: reporterS.TestWriteCallSuccessWithStreamFlagAndReason (test skip reason)	0.000s
PASS: reporter_test.go:136: reporterS.TestWriteCallSuccessWithoutStreamFlagWithVerboseFlag	0.000s
PASS: reporter_test.go:149: reporterS.TestWriteCallSuccessWithoutStreamFlagWithoutVerboseFlag	0.000s
PASS: run_test.go:102: RunS.TestAdd	0.000s
PASS: run_test.go:18: RunS.TestCountSuite	0.000s
PASS: run_test.go:36: RunS.TestFailure	0.000s
PASS: run_test.go:258: RunS.TestFilterAllOut	0.000s
PASS: run_test.go:274: RunS.TestFilterError	0.000s
PASS: run_test.go:229: RunS.TestFilterSuiteName	0.001s
PASS: run_test.go:245: RunS.TestFilterSuiteNameAndTestName	0.000s
PASS: run_test.go:200: RunS.TestFilterTestName	0.000s
PASS: run_test.go:213: RunS.TestFilterTestNameWithAll	0.000s
PASS: run_test.go:48: RunS.TestFixture	0.000s
PASS: run_test.go:410: RunS.TestKeepWorkDir	0.000s
PASS: run_test.go:294: RunS.TestList	0.000s
PASS: run_test.go:287: RunS.TestListFiltered	0.000s
PASS: run_test.go:86: RunS.TestPanicOnSetUpSuite	0.000s
PASS: run_test.go:73: RunS.TestPanicOnSetUpTest	0.000s
PASS: run_test.go:60: RunS.TestPanicOnTest	0.001s
PASS: run_test.go:134: RunS.TestPassed	0.000s
PASS: run_test.go:183: RunS.TestPrintAll	0.000s
PASS: run_test.go:163: RunS.TestPrintExpectedFailures	0.000s
PASS: run_test.go:153: RunS.TestPrintFailure	0.000s
PASS: run_test.go:173: RunS.TestPrintFixturePanicked	0.000s
PASS: run_test.go:178: RunS.TestPrintMissed	0.000s
PASS: run_test.go:168: RunS.TestPrintPanicked	0.000s
PASS: run_test.go:191: RunS.TestPrintRunError	0.000s
PASS: run_test.go:158: RunS.TestPrintSkipped	0.000s
PASS: run_test.go:148: RunS.TestPrintSuccess	0.000s
PASS: run_test.go:266: RunS.TestRequirePartialMatch	0.001s
PASS: run_test.go:360: RunS.TestStreamMode	0.001s
PASS: run_test.go:387: RunS.TestStreamModeWithMiss	0.000s
PASS: run_test.go:24: RunS.TestSuccess	0.000s
PASS: run_test.go:305: RunS.TestVerboseMode	0.001s
PASS: run_test.go:317: RunS.TestVerboseModeWithFailBeforePass	0.001s
OK: 138 passed
--- PASS: Test (0.16s)
PASS
ok  	gopkg.in/check.v1	(cached)

[hpidcock]

Or if we land this PR #126