support/testing: add git runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 24efb23a1074b920fe32763ae455a4694410eb6e)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

DEVELOPERS

@@ -1885,6 +1885,7 @@ F:	support/testing/tests/package/test_fwts.py
 F:	support/testing/tests/package/test_gawk.py
 F:	support/testing/tests/package/test_ghostscript.py
 F:	support/testing/tests/package/test_ghostscript/
+F:	support/testing/tests/package/test_git.py
 F:	support/testing/tests/package/test_glslsandbox_player.py
 F:	support/testing/tests/package/test_glslsandbox_player/
 F:	support/testing/tests/package/test_gnupg2.py

support/testing/tests/package/test_git.py

@@ -0,0 +1,57 @@
+import os
+
+import infra.basetest
+
+
+class TestGit(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_GIT=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # Check the program can execute.
+        self.assertRunOk("git --version")
+
+        # Initialize some git global configuration.
+        git_cfg = [
+            ("user.name", "Build Root"),
+            ("user.email", "build.root@localhost.localdomain"),
+            ("color.ui", "false"),
+            ("init.defaultBranch", "master"),
+            ("core.pager", "")
+        ]
+        for cfg_name, cfg_value in git_cfg:
+            cmd = f"git config --global {cfg_name} '{cfg_value}'"
+            self.assertRunOk(cmd)
+
+        # Run a sequence of few git commands.
+        commands = [
+            "mkdir workdir",
+            "cd workdir",
+            "git init",
+            "echo 'Hello World' > file.txt",
+            "git add file.txt",
+            "git commit -as -m 'Initial commit'",
+            "git checkout -b my_branch",
+            "sed -i 's/World/Buildroot/g' file.txt",
+            "git status",
+            "git commit -as -m 'Replace World by Buildroot'",
+            "git format-patch -M -n -s -o patches master",
+            "ls -al patches/*.patch",
+            "git checkout -b another_branch master",
+            "git am patches/*.patch",
+            "git diff --exit-code my_branch another_branch",
+            "git tag -a -m 'Tagged v1.0' v1.0",
+            "git log"
+        ]
+        for cmd in commands:
+            self.assertRunOk(cmd)