Generate valid file Pod Names and test for them

Ensure that pods coming from the unit test configuration validate,
and that proper names are generated.

Lowercases source filenames, strips all but a-z0-9, and tests
for consistent results.

pkg/kubelet/config/file_test.go

@@ -148,8 +148,8 @@ func TestExtractFromEmptyDir(t *testing.T) {
 
 func TestExtractFromDir(t *testing.T) {
 	manifests := []api.ContainerManifest{
-		{ID: "", Containers: []api.Container{{Image: "foo"}}},
-		{ID: "", Containers: []api.Container{{Image: "bar"}}},
+		{Version: "v1beta1", Containers: []api.Container{{Name: "1", Image: "foo"}}},
+		{Version: "v1beta1", Containers: []api.Container{{Name: "2", Image: "bar"}}},
 	}
 	files := make([]*os.File, len(manifests))
 
@@ -193,6 +193,32 @@ func TestExtractFromDir(t *testing.T) {
 	if !reflect.DeepEqual(expected, update) {
 		t.Errorf("Expected %#v, Got %#v", expected, update)
 	}
+	for i := range update.Pods {
+		if errs := kubelet.ValidatePod(&update.Pods[i]); len(errs) != 0 {
+			t.Errorf("Expected no validation errors on %#v, Got %#v", update.Pods[i], errs)
+		}
+	}
+}
+
+func TestSubdomainSafeName(t *testing.T) {
+	type Case struct {
+		Input    string
+		Expected string
+	}
+	testCases := []Case{
+		{"/some/path/invalidUPPERCASE", "invaliduppercasa6hlenc0vpqbbdtt26ghneqsq3pvud"},
+		{"/some/path/_-!%$#&@^&*(){}", "nvhc03p016m60huaiv3avts372rl2p"},
+	}
+	for _, testCase := range testCases {
+		value := simpleSubdomainSafeHash(testCase.Input)
+		if value != testCase.Expected {
+			t.Errorf("Expected %s, Got %s", testCase.Expected, value)
+		}
+		value2 := simpleSubdomainSafeHash(testCase.Input)
+		if value != value2 {
+			t.Errorf("Value for %s was not stable across runs: %s %s", testCase.Input, value, value2)
+		}
+	}
 }
 
 // These are used for testing extract json (below)