func TestCycles(t *testing.T) {
for _, test := range []struct {
descr string
ctxt *build.Context
wantErr string
}{
{
"self-cycle",
fakeContext(map[string]string{
"main": `package main; import _ "selfcycle"`,
"selfcycle": `package selfcycle; import _ "selfcycle"`,
}),
`import cycle: selfcycle -> selfcycle`,
},
{
"three-package cycle",
fakeContext(map[string]string{
"main": `package main; import _ "a"`,
"a": `package a; import _ "b"`,
"b": `package b; import _ "c"`,
"c": `package c; import _ "a"`,
}),
`import cycle: c -> a -> b -> c`,
},
{
"self-cycle in dependency of test file",
buildutil.FakeContext(map[string]map[string]string{
"main": {
"main.go": `package main`,
"main_test.go": `package main; import _ "a"`,
},
"a": {
"a.go": `package a; import _ "a"`,
},
}),
`import cycle: a -> a`,
},
// TODO(adonovan): fix: these fail
// {
// "two-package cycle in dependency of test file",
// buildutil.FakeContext(map[string]map[string]string{
// "main": {
// "main.go": `package main`,
// "main_test.go": `package main; import _ "a"`,
// },
// "a": {
// "a.go": `package a; import _ "main"`,
// },
// }),
// `import cycle: main -> a -> main`,
// },
// {
// "self-cycle in augmented package",
// buildutil.FakeContext(map[string]map[string]string{
// "main": {
// "main.go": `package main`,
// "main_test.go": `package main; import _ "main"`,
// },
// }),
// `import cycle: main -> main`,
// },
} {
conf := loader.Config{
AllowErrors: true,
SourceImports: true,
Build: test.ctxt,
}
var mu sync.Mutex
var allErrors []error
conf.TypeChecker.Error = func(err error) {
mu.Lock()
allErrors = append(allErrors, err)
mu.Unlock()
}
conf.ImportWithTests("main")
prog, err := conf.Load()
if err != nil {
t.Errorf("%s: Load failed: %s", test.descr, err)
}
if prog == nil {
t.Fatalf("%s: Load returned nil *Program", test.descr)
}
if !hasError(allErrors, test.wantErr) {
t.Errorf("%s: Load() errors = %q, want %q",
test.descr, allErrors, test.wantErr)
}
}
// TODO(adonovan):
// - Test that in a legal test cycle, none of the symbols
// defined by augmentation are visible via import.
}
func TestStdlib(t *testing.T) {
runtime.GC()
t0 := time.Now()
var memstats runtime.MemStats
runtime.ReadMemStats(&memstats)
alloc := memstats.Alloc
// Load, parse and type-check the program.
ctxt := build.Default // copy
ctxt.GOPATH = "" // disable GOPATH
conf := loader.Config{Build: &ctxt}
for _, path := range buildutil.AllPackages(conf.Build) {
if err := conf.ImportWithTests(path); err != nil {
t.Error(err)
}
}
prog, err := conf.Load()
if err != nil {
t.Fatalf("Load failed: %v", err)
}
t1 := time.Now()
runtime.GC()
runtime.ReadMemStats(&memstats)
numPkgs := len(prog.AllPackages)
if want := 205; numPkgs < want {
t.Errorf("Loaded only %d packages, want at least %d", numPkgs, want)
}
// Dump package members.
if false {
for pkg := range prog.AllPackages {
fmt.Printf("Package %s:\n", pkg.Path())
scope := pkg.Scope()
for _, name := range scope.Names() {
if ast.IsExported(name) {
fmt.Printf("\t%s\n", types.ObjectString(pkg, scope.Lookup(name)))
}
}
fmt.Println()
}
}
// Check that Test functions for io/ioutil, regexp and
// compress/bzip2 are all simultaneously present.
// (The apparent cycle formed when augmenting all three of
// these packages by their tests was the original motivation
// for reporting b/7114.)
//
// compress/bzip2.TestBitReader in bzip2_test.go imports io/ioutil
// io/ioutil.TestTempFile in tempfile_test.go imports regexp
// regexp.TestRE2Search in exec_test.go imports compress/bzip2
for _, test := range []struct{ pkg, fn string }{
{"io/ioutil", "TestTempFile"},
{"regexp", "TestRE2Search"},
{"compress/bzip2", "TestBitReader"},
} {
info := prog.Imported[test.pkg]
if info == nil {
t.Errorf("failed to load package %q", test.pkg)
continue
}
obj, _ := info.Pkg.Scope().Lookup(test.fn).(*types.Func)
if obj == nil {
t.Errorf("package %q has no func %q", test.pkg, test.fn)
continue
}
}
// Dump some statistics.
// determine line count
var lineCount int
prog.Fset.Iterate(func(f *token.File) bool {
lineCount += f.LineCount()
return true
})
t.Log("GOMAXPROCS: ", runtime.GOMAXPROCS(0))
t.Log("#Source lines: ", lineCount)
t.Log("Load/parse/typecheck: ", t1.Sub(t0))
t.Log("#MB: ", int64(memstats.Alloc-alloc)/1000000)
}