github.com/anchore/syft@v1.38.2/test/cli/trait_assertions_test.go

package cli

import (
	"encoding/json"
	"fmt"
	"os"
	"regexp"
	"sort"
	"strings"
	"testing"

	"github.com/acarl005/stripansi"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/anchore/syft/syft/format/syftjson/model"
)

type traitAssertion func(tb testing.TB, stdout, stderr string, rc int)

func assertFileOutput(tb testing.TB, path string, assertions ...traitAssertion) traitAssertion {
	tb.Helper()

	return func(tb testing.TB, _, stderr string, rc int) {
		content, err := os.ReadFile(path)
		require.NoError(tb, err)
		contentStr := string(content)

		for _, assertion := range assertions {
			// treat the file content as stdout
			assertion(tb, contentStr, stderr, rc)
		}
	}
}

func assertJsonReport(tb testing.TB, stdout, _ string, _ int) {
	tb.Helper()
	var data interface{}

	if err := json.Unmarshal([]byte(stdout), &data); err != nil {
		tb.Errorf("expected to find a JSON report, but was unmarshalable: %+v", err)
	}
}

func assertTableReport(tb testing.TB, stdout, _ string, _ int) {
	tb.Helper()
	if !strings.Contains(stdout, "NAME") || !strings.Contains(stdout, "VERSION") || !strings.Contains(stdout, "TYPE") {
		tb.Errorf("expected to find a table report, but did not")
	}
}

//func assertScope(scope source.Scope) traitAssertion {
//	return func(tb testing.TB, stdout, stderr string, rc int) {
//		tb.Helper()
//		// we can only verify source with the json report
//		assertJsonReport(tb, stdout, stderr, rc)
//
//		if !strings.Contains(stdout, fmt.Sprintf(`"scope": "%s"`, scope.String())) {
//			tb.Errorf("JSON report did not indicate the %q scope", scope)
//		}
//	}
//}

func assertLoggingLevel(level string) traitAssertion {
	// match examples:
	//  "[0000]  INFO"
	//  "[0012] DEBUG"
	logPattern := regexp.MustCompile(`(?m)^\[\d\d\d\d\]\s+` + strings.ToUpper(level))
	return func(tb testing.TB, _, stderr string, _ int) {
		tb.Helper()
		if !logPattern.MatchString(stripansi.Strip(stderr)) {
			tb.Errorf("output did not indicate the %q logging level", level)
		}
	}
}

func assertNotInOutput(data string) traitAssertion {
	return func(tb testing.TB, stdout, stderr string, _ int) {
		tb.Helper()
		if strings.Contains(stripansi.Strip(stderr), data) {
			tb.Errorf("data=%q was found in stderr, but should not have been there", data)
		}
		if strings.Contains(stripansi.Strip(stdout), data) {
			tb.Errorf("data=%q was found in stdout, but should not have been there", data)
		}
	}
}

func assertNoStderr(tb testing.TB, _, stderr string, _ int) {
	tb.Helper()
	if len(stderr) > 0 {
		tb.Errorf("expected stderr to be empty, but wasn't")
		if showOutput != nil && *showOutput {
			tb.Errorf("STDERR:%s", stderr)
		}
	}
}

func assertInOutput(data string) traitAssertion {
	return func(tb testing.TB, stdout, stderr string, _ int) {
		tb.Helper()
		stdout = stripansi.Strip(stdout)
		stderr = stripansi.Strip(stderr)
		if !strings.Contains(stdout, data) && !strings.Contains(stderr, data) {
			tb.Errorf("data=%q was NOT found in any output, but should have been there", data)
			if showOutput != nil && *showOutput {
				tb.Errorf("STDOUT:%s\nSTDERR:%s", stdout, stderr)
			}
		}
	}
}

func assertStdoutLengthGreaterThan(length uint) traitAssertion {
	return func(tb testing.TB, stdout, _ string, _ int) {
		tb.Helper()
		if uint(len(stdout)) < length {
			tb.Errorf("not enough output (expected at least %d, got %d)", length, len(stdout))
		}
	}
}

func assertPackageCount(length uint) traitAssertion {
	return func(tb testing.TB, stdout, _ string, _ int) {
		tb.Helper()
		type NameAndVersion struct {
			Name    string `json:"name"`
			Version string `json:"version"`
			Type    string `json:"type"`
		}
		type partial struct {
			Artifacts []NameAndVersion `json:"artifacts"`
		}
		var data partial

		if err := json.Unmarshal([]byte(stdout), &data); err != nil {
			tb.Errorf("expected to find a JSON report, but was unmarshalable: %+v", err)
		}

		if uint(len(data.Artifacts)) != length {
			tb.Errorf("expected package count of %d, but found %d", length, len(data.Artifacts))
			debugArtifacts := make([]string, len(data.Artifacts))
			for i, a := range data.Artifacts {
				debugArtifacts[i] = fmt.Sprintf("%s@%s (%s)", a.Name, a.Version, a.Type)
			}
			sort.Strings(debugArtifacts)
			for i, a := range debugArtifacts {
				tb.Errorf("package %d: %s", i+1, a)
			}

		}
	}
}

func assertUnknownLicenseContent(required bool) traitAssertion {
	return func(tb testing.TB, stdout, _ string, _ int) {
		tb.Helper()
		type NameAndLicense struct {
			Name     string          `json:"name"`
			Licenses []model.License `json:"Licenses"`
		}
		type partial struct {
			Artifacts []NameAndLicense `json:"artifacts"`
		}

		var data partial
		if err := json.Unmarshal([]byte(stdout), &data); err != nil {
			tb.Errorf("expected to find a JSON report, but was unmarshalable: %+v", err)
		}

		for _, pkg := range data.Artifacts {
			for _, lic := range pkg.Licenses {
				if strings.Contains(lic.Value, "sha256") && required {
					assert.NotZero(tb, len(lic.Contents))
				} else {
					assert.Empty(tb, lic.Contents)
				}
			}
		}
	}
}

func assertFailingReturnCode(tb testing.TB, _, _ string, rc int) {
	tb.Helper()
	if rc == 0 {
		tb.Errorf("expected a failure but got rc=%d", rc)
	}
}

func assertSuccessfulReturnCode(tb testing.TB, _, _ string, rc int) {
	tb.Helper()
	if rc != 0 {
		tb.Errorf("expected no failure but got rc=%d", rc)
	}
}

func assertFileExists(file string) traitAssertion {
	return func(tb testing.TB, _, _ string, _ int) {
		tb.Helper()
		if _, err := os.Stat(file); err != nil {
			tb.Errorf("expected file to exist %s", file)
		}
	}
}