fstests: Use a different container after the Rmdir

Use a new directory here.  This is for the container based remotes
which take time to create and destroy a container (eg azure blob)

fstest/fstests/fstests.go

@@ -54,6 +54,22 @@ var (
 // ExtraConfigItem describes a config item added on the fly while testing
 type ExtraConfigItem struct{ Name, Key, Value string }
 
+// Make the Fs we are testing with, initialising the global variables
+// subRemoteName - name of the remote after the TestRemote:
+// subRemoteLeaf - a subdirectory to use under that
+// remote - the result of  fs.NewFs(TestRemote:subRemoteName)
+func newFs(t *testing.T) {
+	var err error
+	subRemoteName, subRemoteLeaf, err = fstest.RandomRemoteName(RemoteName)
+	require.NoError(t, err)
+	remote, err = fs.NewFs(subRemoteName)
+	if err == fs.ErrorNotFoundInConfigFile {
+		t.Logf("Didn't find %q in config file - skipping tests", RemoteName)
+		return
+	}
+	require.NoError(t, err, fmt.Sprintf("unexpected error: %v", err))
+}
+
 // TestInit tests basic intitialisation
 func TestInit(t *testing.T) {
 	var err error
@@ -79,15 +95,10 @@ func TestInit(t *testing.T) {
 		require.NoError(t, err)
 		isLocalRemote = true
 	}
-	subRemoteName, subRemoteLeaf, err = fstest.RandomRemoteName(RemoteName)
-	require.NoError(t, err)
 
-	remote, err = fs.NewFs(subRemoteName)
-	if err == fs.ErrorNotFoundInConfigFile {
-		t.Logf("Didn't find %q in config file - skipping tests", RemoteName)
-		return
-	}
-	require.NoError(t, err, fmt.Sprintf("unexpected error: %v", err))
+	newFs(t)
+
+	skipIfNotOk(t)
 	fstest.TestMkdir(t, remote)
 }
 
@@ -158,6 +169,12 @@ func TestFsRmdirNotFound(t *testing.T) {
 // TestFsMkdir tests tests making a directory
 func TestFsMkdir(t *testing.T) {
 	skipIfNotOk(t)
+
+	// Use a new directory here.  This is for the container based
+	// remotes which take time to create and destroy a container
+	// (eg azure blob)
+	newFs(t)
+
 	fstest.TestMkdir(t, remote)
 	fstest.TestMkdir(t, remote)
 }