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How to use TestMain method of main Package

Best Testkube code snippet using main.TestMain

testmain.go

Source:testmain.go

1// Copyright 2013 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4package ssa5// CreateTestMainPackage synthesizes a main package that runs all the6// tests of the supplied packages.7// It is closely coupled to $GOROOT/src/cmd/go/test.go and $GOROOT/src/testing.8//9// TODO(adonovan): throws this all away now that x/tools/go/packages10// provides access to the actual synthetic test main files.11import (12	"bytes"13	"fmt"14	"go/ast"15	"go/parser"16	"go/types"17	"log"18	"os"19	"strings"20	"text/template"21)22// FindTests returns the Test, Benchmark, and Example functions23// (as defined by "go test") defined in the specified package,24// and its TestMain function, if any.25//26// Deprecated: use x/tools/go/packages to access synthetic testmain packages.27func FindTests(pkg *Package) (tests, benchmarks, examples []*Function, main *Function) {28	prog := pkg.Prog29	// The first two of these may be nil: if the program doesn't import "testing",30	// it can't contain any tests, but it may yet contain Examples.31	var testSig *types.Signature                              // func(*testing.T)32	var benchmarkSig *types.Signature                         // func(*testing.B)33	var exampleSig = types.NewSignature(nil, nil, nil, false) // func()34	// Obtain the types from the parameters of testing.MainStart.35	if testingPkg := prog.ImportedPackage("testing"); testingPkg != nil {36		mainStart := testingPkg.Func("MainStart")37		params := mainStart.Signature.Params()38		testSig = funcField(params.At(1).Type())39		benchmarkSig = funcField(params.At(2).Type())40		// Does the package define this function?41		//   func TestMain(*testing.M)42		if f := pkg.Func("TestMain"); f != nil {43			sig := f.Type().(*types.Signature)44			starM := mainStart.Signature.Results().At(0).Type() // *testing.M45			if sig.Results().Len() == 0 &&46				sig.Params().Len() == 1 &&47				types.Identical(sig.Params().At(0).Type(), starM) {48				main = f49			}50		}51	}52	// TODO(adonovan): use a stable order, e.g. lexical.53	for _, mem := range pkg.Members {54		if f, ok := mem.(*Function); ok &&55			ast.IsExported(f.Name()) &&56			strings.HasSuffix(prog.Fset.Position(f.Pos()).Filename, "_test.go") {57			switch {58			case testSig != nil && isTestSig(f, "Test", testSig):59				tests = append(tests, f)60			case benchmarkSig != nil && isTestSig(f, "Benchmark", benchmarkSig):61				benchmarks = append(benchmarks, f)62			case isTestSig(f, "Example", exampleSig):63				examples = append(examples, f)64			default:65				continue66			}67		}68	}69	return70}71// Like isTest, but checks the signature too.72func isTestSig(f *Function, prefix string, sig *types.Signature) bool {73	return isTest(f.Name(), prefix) && types.Identical(f.Signature, sig)74}75// Given the type of one of the three slice parameters of testing.Main,76// returns the function type.77func funcField(slice types.Type) *types.Signature {78	return slice.(*types.Slice).Elem().Underlying().(*types.Struct).Field(1).Type().(*types.Signature)79}80// isTest tells whether name looks like a test (or benchmark, according to prefix).81// It is a Test (say) if there is a character after Test that is not a lower-case letter.82// We don't want TesticularCancer.83// Plundered from $GOROOT/src/cmd/go/test.go84func isTest(name, prefix string) bool {85	if !strings.HasPrefix(name, prefix) {86		return false87	}88	if len(name) == len(prefix) { // "Test" is ok89		return true90	}91	return ast.IsExported(name[len(prefix):])92}93// CreateTestMainPackage creates and returns a synthetic "testmain"94// package for the specified package if it defines tests, benchmarks or95// executable examples, or nil otherwise.  The new package is named96// "main" and provides a function named "main" that runs the tests,97// similar to the one that would be created by the 'go test' tool.98//99// Subsequent calls to prog.AllPackages include the new package.100// The package pkg must belong to the program prog.101//102// Deprecated: use x/tools/go/packages to access synthetic testmain packages.103func (prog *Program) CreateTestMainPackage(pkg *Package) *Package {104	if pkg.Prog != prog {105		log.Fatal("Package does not belong to Program")106	}107	// Template data108	var data struct {109		Pkg                         *Package110		Tests, Benchmarks, Examples []*Function111		Main                        *Function112		Go18                        bool113	}114	data.Pkg = pkg115	// Enumerate tests.116	data.Tests, data.Benchmarks, data.Examples, data.Main = FindTests(pkg)117	if data.Main == nil &&118		data.Tests == nil && data.Benchmarks == nil && data.Examples == nil {119		return nil120	}121	// Synthesize source for testmain package.122	path := pkg.Pkg.Path() + "$testmain"123	tmpl := testmainTmpl124	if testingPkg := prog.ImportedPackage("testing"); testingPkg != nil {125		// In Go 1.8, testing.MainStart's first argument is an interface, not a func.126		data.Go18 = types.IsInterface(testingPkg.Func("MainStart").Signature.Params().At(0).Type())127	} else {128		// The program does not import "testing", but FindTests129		// returned non-nil, which must mean there were Examples130		// but no Test, Benchmark, or TestMain functions.131		// We'll simply call them from testmain.main; this will132		// ensure they don't panic, but will not check any133		// "Output:" comments.134		// (We should not execute an Example that has no135		// "Output:" comment, but it's impossible to tell here.)136		tmpl = examplesOnlyTmpl137	}138	var buf bytes.Buffer139	if err := tmpl.Execute(&buf, data); err != nil {140		log.Fatalf("internal error expanding template for %s: %v", path, err)141	}142	if false { // debugging143		fmt.Fprintln(os.Stderr, buf.String())144	}...

TestMain

Using AI Code Generation

1import (2func TestMain(m *testing.M) {3	fmt.Println("TestMain")4	os.Exit(m.Run())5}6func Test1(t *testing.T) {7	fmt.Println("Test1")8}9func Test2(t *testing.T) {10	fmt.Println("Test2")11}12func Test3(t *testing.T) {13	fmt.Println("Test3")14}

TestMain

Using AI Code Generation

1import (2func TestMain(m *testing.M) {3    fmt.Println("TestMain is called")4    os.Exit(m.Run())5}6func Test1(t *testing.T) {7    fmt.Println("Test1 is called")8}9func Test2(t *testing.T) {10    fmt.Println("Test2 is called")11}

TestMain

Using AI Code Generation

1import (2func TestMain(m *testing.M) {3    flag.Parse()4    code := m.Run()5    os.Exit(code)6}7func TestHello(t *testing.T) {8    t.Log("hello")9}10func TestWorld(t *testing.T) {11    t.Log("world")12}13import (14func TestMain(m *testing.M) {15    flag.Parse()16    code := m.Run()17    os.Exit(code)18}19func TestHello(t *testing.T) {20    t.Log("hello")21}22func TestWorld(t *testing.T) {23    t.Log("world")24}25import (26func TestMain(m *testing.M) {27    flag.Parse()28    code := m.Run()29    os.Exit(code)30}31func TestHello(t *testing.T) {32    t.Log("hello")33}34func TestWorld(t *testing.T) {35    t.Log("world")36}37import (38func TestMain(m *testing.M) {39    flag.Parse()40    code := m.Run()41    os.Exit(code)42}43func TestHello(t *testing.T) {44    t.Log("hello")45}46func TestWorld(t *testing.T) {47    t.Log("world")48}

TestMain

Using AI Code Generation

1import (2func TestMain(m *testing.M) {3    m.Run()4}5import (6func TestMain(m *testing.M) {7    m.Run()8}9import (10func TestMain(m *testing.M) {11    m.Run()12}13import (14func TestMain(m *testing.M) {15    m.Run()16}17import (18func TestMain(m *testing.M) {19    m.Run()20}21import (22func TestMain(m *testing.M) {23    m.Run()24}25import (26func TestMain(m *testing.M) {27    m.Run()28}29import (30func TestMain(m *testing.M) {31    m.Run()32}33import (34func TestMain(m *testing.M) {35    m.Run()36}37import (38func TestMain(m *testing.M) {39    m.Run()40}

TestMain

Using AI Code Generation

1import (2func TestMain(m *testing.M) {3	println("Setup")4	os.Exit(m.Run())5}6import (7func TestMain(m *testing.M) {8	println("Setup")9	os.Exit(m.Run())10}11import (12func TestMain(m *testing.M) {13	println("Setup")14	os.Exit(m.Run())15}16import (17func TestMain(m *testing.M) {18	println("Setup")19	os.Exit(m.Run())20}21import (22func TestMain(m *testing.M) {23	println("Setup")24	os.Exit(m.Run())25}26import (27func TestMain(m *testing.M) {28	println("Setup")29	os.Exit(m.Run())30}31import (32func TestMain(m *testing.M) {33	println("Setup")34	os.Exit(m.Run())35}36import (37func TestMain(m *testing.M) {38	println("Setup")39	os.Exit(m.Run())40}41import (42func TestMain(m *testing.M) {43	println("Setup")

TestMain

Using AI Code Generation

1import (2func TestMain(m *testing.M) {3	fmt.Println("TestMain method is called")4	os.Exit(m.Run())5}6func TestOne(t *testing.T) {7	fmt.Println("TestOne method is called")8}9func TestTwo(t *testing.T) {10	fmt.Println("TestTwo method is called")11}12func TestThree(t *testing.T) {13	fmt.Println("TestThree method is called")14}15import (16func TestMain(m *testing.M) {17	fmt.Println("TestMain method is called")18	os.Exit(m.Run())19}20func TestOne(t *testing.T) {21	fmt.Println("TestOne method is called")22}23func TestTwo(t *testing.T) {24	fmt.Println("TestTwo method is called")25}26func TestThree(t *testing.T) {27	fmt.Println("TestThree method is called")28}29import (30func TestMain(m *testing.M) {31	fmt.Println("TestMain method is called")32	os.Exit(m.Run())33}34func TestOne(t *testing.T) {35	fmt.Println("TestOne method is called")36}37func TestTwo(t *testing.T) {38	fmt.Println("TestTwo method is called")39}40func TestThree(t *testing.T) {41	fmt.Println("TestThree method is called")42}43import (44func TestMain(m *testing.M) {45	fmt.Println("TestMain method is called")46	os.Exit(m.Run())47}48func TestOne(t *testing.T) {49	fmt.Println("TestOne method is called")50}51func TestTwo(t *testing.T) {52	fmt.Println("TestTwo method is called

TestMain

Using AI Code Generation

1func TestMain(m *testing.M) {2    os.Exit(m.Run())3}4func TestAdd(t *testing.T) {5}6func TestSub(t *testing.T) {7}8func TestMul(t *testing.T) {9}10func TestDiv(t *testing.T) {11}12func TestAdd(t *testing.T) {13}14func TestSub(t *testing.T) {15}16func TestMul(t *testing.T) {17}18func TestDiv(t *testing.T) {19}20func TestAdd(t *testing.T) {21}22func TestSub(t *testing.T) {23}24func TestMul(t *testing.T) {25}26func TestDiv(t *testing.T) {27}28--- PASS: TestAdd (0.00s)29--- PASS: TestSub (0.00s)30--- PASS: TestMul (0.00s)31--- PASS: TestDiv (0.00s)

TestMain

Using AI Code Generation

1import (2var (3	flg = flag.Bool("test", false, "test flag")4func TestMain(m *testing.M) {5	flag.Parse()6	if *flg {7		fmt.Println("Testing...")8		os.Exit(0)9	}10	os.Exit(m.Run())11}12func TestOne(t *testing.T) {13	fmt.Println("Test one.")14}15--- PASS: TestOne (0.00s)16--- PASS: TestOne (0.00s)17--- PASS: TestOne (0.00s)18--- PASS: TestOne (0.00s)

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