test_git: add tests for version=<sha1> case

This test covers a recently fixed bug,
https://github.com/ansible/ansible-modules-core/issues/313

test/integration/roles/test_git/tasks/main.yml

@@ -153,6 +153,52 @@
     that:
       - 'git_result.changed'
 
+# Test that a specific revision can be checked out
+
+- name: clean out the checkout_dir
+  shell: rm -rf {{ checkout_dir }}/*
+
+- name: clone to specific revision
+  git: repo={{ repo_format1 }} dest={{ checkout_dir }} version=df4612ba925fbc1b3c51cbb006f51a0443bd2ce9
+
+- name: check HEAD after clone to revision
+  command: git rev-parse HEAD chdir="{{ checkout_dir }}"
+  register: git_result
+
+- assert:
+    that:
+      - 'git_result.stdout == "df4612ba925fbc1b3c51cbb006f51a0443bd2ce9"'
+
+- name: update to specific revision
+  git: repo={{ repo_format1 }} dest={{ checkout_dir }} version=4e739a34719654db7b04896966e2354e1256ea5d
+  register: git_result
+
+- assert:
+    that:
+      - 'git_result.changed'
+
+- name: check HEAD after update to revision
+  command: git rev-parse HEAD chdir="{{ checkout_dir }}"
+  register: git_result
+
+- assert:
+    that:
+      - 'git_result.stdout == "4e739a34719654db7b04896966e2354e1256ea5d"'
+
+# Test a revision not available under refs/heads/ or refs/tags/
+
+- name: attempt to get unavailable revision
+  git:
+    repo: https://github.com/ansible/ansible-examples.git
+    dest: '{{ checkout_dir }}'
+    version: 2cfde3668b8bb10fbe2b9d5cec486025ad8cc51b
+  ignore_errors: true
+  register: git_result
+
+- assert:
+    that:
+      - 'git_result.failed'
+
 #
 # Submodule tests
 #