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Document how to run unittests in -betterC #2436

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Aug 3, 2018
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Document how to run unittests in -betterC #2436

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27 changes: 26 additions & 1 deletion spec/betterc.dd
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Original file line number Diff line number Diff line change
Expand Up @@ -82,8 +82,34 @@ $(H2 $(LNAME2 retained, Retained Features))
$(LI COM classes and C++ classes)
$(LI `assert` failures are directed to the C runtime library)
$(LI `switch` with strings)
$(LI `unittest`)
)

$(H3 $(LNAME2 unittests, Running unittests in `-betterC`))

While, testing can be done without the $(TT -betterC) flag, it is sometimes desirable to run the testsuite in `-betterC` too.
`unittest` blocks can be listed with the $(DDSUBLINK spec/traits, getUnitTests, `getUnitTests`) trait:

---
unittest
{
assert(0);
}

extern(C) void main()
{
static foreach(u; __traits(getUnitTests, __traits(parent, main)))
u();
}
---

$(CONSOLE
> dmd -betterC -unittest -run test.d
dmd_runpezoXK: foo.d:3: Assertion `0' failed.
)

However, in `-betterC` `assert` expressions don't use Druntime's assert and are directed to `assert` of the C runtime library instead.

$(H2 $(LNAME2 consequences, Unavailable Features))

$(P D features not available with $(B BetterC):)
Expand All @@ -98,7 +124,6 @@ $(OL
$(LI `final switch`)
$(LI `synchronized` and $(MREF core, sync))
$(LI Static module constructors or destructors)
$(LI `unittest` (testing can be done without the $(TT -betterC) flag))
)


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