binman: Add tests for bintool

Add tests to cover the bintool functionality.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/btool/_testing.py

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright 2022 Google LLC
+#
+"""Bintool used for testing
+
+This is not a real bintool, just one used for testing"""
+
+from binman import bintool
+
+# pylint: disable=C0103
+class Bintool_testing(bintool.Bintool):
+    """Bintool used for testing"""
+    def __init__(self, name):
+        super().__init__(name, 'testing')
+        self.present = False
+        self.install = False
+        self.disable = False
+
+    def is_present(self):
+        if self.present is None:
+            return super().is_present()
+        return self.present
+
+    def version(self):
+        return '123'
+
+    def fetch(self, method):
+        if self.disable:
+            return super().fetch(method)
+        if method == bintool.FETCH_BIN:
+            if self.install:
+                return self.apt_install('package')
+            return self.fetch_from_drive('junk')
+        if method == bintool.FETCH_BUILD:
+            return self.build_from_git('url', 'target', 'pathname')
+        return None