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+// Checker provide Docker specific implementations of the go-check.Checker interface.

+package checker

+

+import (

+	"fmt"

+	"strings"

+

+	"github.com/go-check/check"

+)

+

+// As a commodity, we bring all check.Checker variables into the current namespace to avoid having

+// to think about check.X versus checker.X.

+var (

+	DeepEquals   = check.DeepEquals

+	Equals       = check.Equals

+	ErrorMatches = check.ErrorMatches

+	FitsTypeOf   = check.FitsTypeOf

+	HasLen       = check.HasLen

+	Implements   = check.Implements

+	IsNil        = check.IsNil

+	Matches      = check.Matches

+	Not          = check.Not

+	NotNil       = check.NotNil

+	PanicMatches = check.PanicMatches

+	Panics       = check.Panics

+)

+

+// Contains checker verifies that string value contains a substring.

+var Contains check.Checker = &containsChecker{

+	&check.CheckerInfo{

+		Name:   "Contains",

+		Params: []string{"value", "substring"},

+	},

+}

+

+type containsChecker struct {

+	*check.CheckerInfo

+}

+

+func (checker *containsChecker) Check(params []interface{}, names []string) (bool, string) {

+	return contains(params[0], params[1])

+}

+

+func contains(value, substring interface{}) (bool, string) {

+	substringStr, ok := substring.(string)

+	if !ok {

+		return false, "Substring must be a string"

+	}

+	valueStr, valueIsStr := value.(string)

+	if !valueIsStr {

+		if valueWithStr, valueHasStr := value.(fmt.Stringer); valueHasStr {

+			valueStr, valueIsStr = valueWithStr.String(), true

+		}

+	}

+	if valueIsStr {

+		return strings.Contains(valueStr, substringStr), ""

+	}

+	return false, "Obtained value is not a string and has no .String()"

+}