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Replace 6.0.0-alpha-2 with the 6.0.0 GA release. - Drop the AbstractCallSite import that was only used by Javadoc, the callsite package moved to the optional groovy-callsite module - Compile the spockframework#1845 switch expression snippet at runtime and skip it on Groovy 6, which no longer allows a statement as an arrow branch body - Add a separate groovy6 bytecode snapshot for AstSpec, as Groovy 6 generates simpler code for empty finally blocks
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe Groovy 6 version changes to 6.0.0. Mock factory documentation, switch-expression tests, release notes, and AST snapshot selection are updated for Groovy 6. ChangesGroovy 6 Compatibility
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Other Suggested reviewers: Merge Risk: ⚪ Minimal · up to No specific merge-blocking regression is identified; proceed with normal validation of the Groovy 6 update. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 4 systems. Changed systems: Architecture concerns Review detailsSystems and components
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| // Groovy 6 no longer accepts a statement like `assert` as the body of an arrow switch expression branch, | ||
| // so the snippet is compiled at runtime to keep this spec compiling on Groovy 6 | ||
| @Issue("https://github.com/spockframework/spock/issues/1845") | ||
| @Requires({ GroovyRuntimeUtil.MAJOR_VERSION < 6 }) | ||
| def "explicit assert in switch expression"() { | ||
| expect: | ||
| def b = 3 | ||
| !!switch (b) { | ||
| case 3 -> assert 1 == 1 | ||
| default -> assert 1 == 1 | ||
| } | ||
| when: | ||
| def result = runner.runFeatureBody ''' | ||
| expect: | ||
| def b = 3 | ||
| !!switch (b) { | ||
| case 3 -> assert 1 == 1 | ||
| default -> assert 1 == 1 | ||
| } | ||
| ''' | ||
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|
||
| then: | ||
| result.testsSucceededCount == 1 |
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Do you mean this changed between 6.0.0-RC-1 and 6.0.0?
Beacuse
switch (null) {
default -> assert 1 == 1
}
switch (null) {
default -> assert 1 == 2
}compiles and runs fine on Groovy 6 in the Webconsole: https://groovyconsole.dev/?g=groovy_6_0_rc&codez=eNorLs8sSc5Q0MgrzcnRVKjmUgCClNS0xNKcEgVdO4XE4uLUohIFQwVbWwVDrlquYuKVGwGVAwBWrRum
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It changed in 6.0.0-beta-3; alpha-1 through beta-2 still accept it, which is why it passed with alpha-2.
Your snippet is a switch statement, and that still compiles on 6.0.0. The test uses a switch expression: the !! only turns the switch into an expression and isn't the problem itself. In a switch expression, Groovy 6 no longer accepts a statement like assert as an arrow branch body. It fails with "yield or throw is expected".
Checked on 5.0.6 and 6.0.0:
| Snippet | 5.0.6 | 6.0.0 |
|---|---|---|
switch (null) { default -> assert 1 == 1 } (statement) |
✅ | ✅ |
def r = switch (b) { case 3 -> assert 1 == 1 … } (expression, no !!) |
✅ | ❌ |
!!switch (b) { case 3 -> assert 1 == 1 … } (the test) |
✅ | ❌ |
!!switch (b) { case 3 -> 1 == 1 … } (expression branches) |
✅ | ✅ |
Other statements such as if and for, and blocks without yield, are rejected the same way, matching Java's rules for arrow branches in switch expressions. So the #1845 snippet can't compile on Groovy 6. It now compiles when the test runs, and the test only runs on Groovy < 6.
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Oh my, they also completely changed what is a switch expression and what not.
Before all those arrow-shaped switches were expressions as they compiled it to a switch statement in a closure that was immediately called.
Now SwitchExpression is an own AST type and only if used in the source as expression it is an expression.
So up to Groovy 6
class Foo extends spock.lang.Specification {
def foo() {
expect:
switch (null) {
case null -> false
default -> true
}
}
}failed due to this being an expression and thus implicit assertion on the expression result was done, so if you had asserts in the single branches you disabled implicit assertion on the switch with !! like in this test.
With Groovy 6 this is a switch statement and thus no assertion is checked anymore unless you explicitly do assert switch ... 🙈
This will cause trouble for people upgrading Groovy version and being used to the old behavior, besides that tests that previously did assert now do not and thus will not fail even if the tested bug comes back.
We should probably put a warning about this in the manual somewhere, including example with !! and explicit assert for the switch variants.
Probably where implicit and explicit assertions are described and it is said that currently only top-level expressions are implicit assertions.
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We should probably even mention it in the change log
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Good catch, I verified this on 4.0, 5.0 and 6.0.0, and it's a bit worse than that. Each switch (null) below evaluates to false, so a checked condition should fail:
expect: / then: body |
4.0 / 5.0 | 6.0.0 |
|---|---|---|
switch (null) { case null -> false … } |
❌ fails (checked) | ✅ passes silently |
(switch (null) { … }) |
❌ fails | ✅ passes silently |
same switch in then: |
❌ fails | ✅ passes silently |
assert switch (null) { … } |
❌ fails | 💥 Spock compile error |
def r = switch (null) { … } then r |
❌ fails | ❌ fails |
!!switch (null) { … } |
not checked | not checked |
The cause is GROOVY-12255 (apache/groovy#2784, first in 6.0.0-beta-3). Switch expressions no longer compile to an immediately called closure; they're a separate SwitchExpression AST node. An arrow switch in statement position becomes a SwitchStatement, even when wrapped in parentheses, and Spock only treats an ExpressionStatement as an implicit condition.
The explicit assert switch … fails with an UnsupportedOperationException from AbstractExpressionConverter.visitCaseStatement: ConditionRewriter can't handle the new SwitchExpression node yet. assert switch … works fine on 4.0 and 5.0 (proper ConditionNotSatisfiedError), so this is a Groovy 6 regression in Spock rather than something that never worked. So right now there's no way to write a checked arrow switch on Groovy 6 except assigning it to a variable first.
My proposal:
- Add the changelog entry to this PR.
- Open a separate issue and PR so
ConditionRewritersupportsSwitchExpression, makingassert switch …work on Groovy 6. - Write the manual warning once that lands, so it can recommend
assert switch ….
Should Spock also warn at compile time about a top-level arrow switch in expect:/then: on Groovy 6? It stops being checked without any indication.
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Each switch (null) below evaluates to false, so a checked condition should fail:
No, it does not, that's the point.
Before they resulted in expression statements.
Now they result in switch statements which are not implicit assertions as I described above.
In Groovy <6, all "arrow-form" switches were expressions as they were compiled to a switch statement in a closure that was then immediately called and the "return last evaluated expression" logic kicked in inside the closure.
Now with the changes in Groovy 6 the shape of the arms does no longer (and that is explicitly intended if you read the breaking changes section of Groovy 6) determine whether it is an expression.
Instead, if a switch is used as an expression (like assigning to a variable or using the ! or !! on it) then it is also compiled as an expression, otherwise it is compiled as the statement it actually is.
If you have the switch statement as last statement in a non-void method, this does not make the switch statement a switch expression either. Just the "last evaluated expression" logic kicks in again which happens to be the last expression in the switch arm that was chosen and thus results in that expression being returned which effectively results in the same return value.
The difference is, that a switch expression needs the yield or throw and needs to be exhaustive when for example switching over an enum, while it does not have to be if it is a switch statement and there it then returns null if none of the paths were chosen.
So no, I don't think it is worse but exactly like I described.
Except for the inability to do asssert switch..., this should be fixed of course.
My proposal:
Sounds fine I'd say.
Should Spock also warn at compile time about a top-level arrow switch in expect:/then: on Groovy 6? It stops being checked without any indication.
I would say no.
Spock says "top-level expressions are implicit assertions" and in Groovy 6 those are no expressions.
A user coming from older Groovy and update to 6 might welcome the warning as it might be unexpected.
But a user starting with Groovy 6 on the other hand will be confused by a senseless warning, because he wrote a statement and Spock warns him that it is not an expression, which would be obvious in that case.
So I think the breaking changes section in Groovy 6, a warning in the implicit assertions section of the Spock docs, and a warning or potentially-breaking warning in the Spock changelog should imho be sufficient.
@leonard84 what do you think?
✅ All tests passed ✅Test SummaryVerify Branches and PRs / Build and Verify (4.0, 8, windows-latest) > :spock-specs:test
Verify Branches and PRs / Build and Verify (6.0, 17, macos-latest) > :spock-specs:test
🏷️ Commit: 66608f5 Test FailuresAsyncConditionsSpec > passing example - check passes (:spock-specs:test in Verify Branches and PRs / Build and Verify (4.0, 8, windows-latest) | Attempt 3/4)BlockingVariablesSpec > passing example 2 - variable is read before it is written (:spock-specs:test in Verify Branches and PRs / Build and Verify (4.0, 8, windows-latest) | Attempt 3/4)BlockingVariablesSpec > passing example 2 - variable is read before it is written (:spock-specs:test in Verify Branches and PRs / Build and Verify (4.0, 8, windows-latest) | Attempt 2/4)IsolatedUseSpec > executing iterations in parallel works with annotated feature (:spock-specs:test in Verify Branches and PRs / Build and Verify (6.0, 17, macos-latest) | Attempt 2/4)TimeoutExtension > method that doesn't complete in time (:spock-specs:test in Verify Branches and PRs / Build and Verify (6.0, 17, macos-latest) | Attempt 2/4)Learn more about TestLens at testlens.app/docs. |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #2416 +/- ##
============================================
+ Coverage 82.29% 82.35% +0.06%
- Complexity 4885 4890 +5
============================================
Files 474 474
Lines 15272 15272
Branches 1966 1966
============================================
+ Hits 12568 12578 +10
+ Misses 2004 1998 -6
+ Partials 700 696 -4
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Since Groovy 6 (GROOVY-12255), a top-level arrow switch in an expect: or then: block is compiled as a switch statement and is no longer checked as an implicit condition.
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Replace 6.0.0-alpha-2 with the 6.0.0 GA release.