Add find tests and remove panic in DEBUG

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

libcontainer/types.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"errors"
 	"github.com/syndtr/gocapability/capability"
-	"os"
 )
 
 var (
@@ -74,16 +73,18 @@ func GetNamespace(key string) *Namespace {
 			return ns
 		}
 	}
-	if os.Getenv("DEBUG") != "" {
-		panic("Unreachable: Namespace not found")
-	}
 	return nil
 }
 
 // Contains returns true if the specified Namespace is
 // in the slice
 func (n Namespaces) Contains(ns string) bool {
-	return GetNamespace(ns) != nil
+	for _, nsp := range n {
+		if nsp.Key == ns {
+			return true
+		}
+	}
+	return false
 }
 
 type (
@@ -121,14 +122,16 @@ func GetCapability(key string) *Capability {
 			return capp
 		}
 	}
-	if os.Getenv("DEBUG") != "" {
-		panic("Unreachable: Capability not found")
-	}
 	return nil
 }
 
 // Contains returns true if the specified Capability is
 // in the slice
 func (c Capabilities) Contains(capp string) bool {
-	return GetCapability(capp) != nil
+	for _, cap := range c {
+		if cap.Key == capp {
+			return true
+		}
+	}
+	return false
 }

libcontainer/types_test.go

@@ -0,0 +1,35 @@
+package libcontainer
+
+import (
+	"testing"
+)
+
+func TestNamespacesContains(t *testing.T) {
+	ns := Namespaces{
+		GetNamespace("NEWPID"),
+		GetNamespace("NEWNS"),
+		GetNamespace("NEWUTS"),
+	}
+
+	if ns.Contains("NEWNET") {
+		t.Fatal("namespaces should not contain NEWNET")
+	}
+
+	if !ns.Contains("NEWPID") {
+		t.Fatal("namespaces should contain NEWPID but does not")
+	}
+}
+
+func TestCapabilitiesContains(t *testing.T) {
+	caps := Capabilities{
+		GetCapability("MKNOD"),
+		GetCapability("SETPCAP"),
+	}
+
+	if caps.Contains("SYS_ADMIN") {
+		t.Fatal("capabilities should not contain SYS_ADMIN")
+	}
+	if !caps.Contains("MKNOD") {
+		t.Fatal("capabilities should container MKNOD but does not")
+	}
+}