thodg/libgit2

diff --git a/src/merge.c b/src/merge.c
index fbae704..c054ad8 100644
--- a/src/merge.c
+++ b/src/merge.c
@@ -3112,9 +3112,6 @@ static int merge_heads(
 	*ancestor_head_out = NULL;
 	*our_head_out = NULL;
 
-	if ((error = git_repository__ensure_not_bare(repo, "merge")) < 0)
-		goto done;
-
 	if ((error = git_annotated_commit_from_ref(&our_head, repo, our_ref)) < 0)
 		goto done;
 
diff --git a/tests/merge/analysis.c b/tests/merge/analysis.c
new file mode 100644
index 0000000..b3c7b03
--- /dev/null
+++ b/tests/merge/analysis.c
@@ -0,0 +1,176 @@
+/*
+NOTE: this is the implementation for both merge/trees/analysis.c and merge/workdir/analysis.c
+You probably want to make changes to both files.
+*/
+
+#include "clar_libgit2.h"
+#include "git2/repository.h"
+#include "git2/merge.h"
+#include "git2/annotated_commit.h"
+#include "git2/sys/index.h"
+#include "merge.h"
+#include "merge_helpers.h"
+#include "refs.h"
+#include "posix.h"
+
+static git_repository *repo;
+static git_index *repo_index;
+
+#define UPTODATE_BRANCH         "master"
+#define PREVIOUS_BRANCH         "previous"
+
+#define FASTFORWARD_BRANCH      "ff_branch"
+#define FASTFORWARD_ID          "fd89f8cffb663ac89095a0f9764902e93ceaca6a"
+
+#define NOFASTFORWARD_BRANCH    "branch"
+#define NOFASTFORWARD_ID        "7cb63eed597130ba4abb87b3e544b85021905520"
+
+
+/* Fixture setup and teardown */
+void testimpl_merge_analysis__initialize(git_repository *t_repo, git_index *t_repo_index)
+{
+	repo = t_repo;
+	repo_index = t_repo_index;
+}
+
+void testimpl_merge_analysis__cleanup(void)
+{
+	repo_index = NULL;
+	repo = NULL;
+}
+
+static void analysis_from_branch(
+	git_merge_analysis_t *merge_analysis,
+	git_merge_preference_t *merge_pref,
+	const char *our_branchname,
+	const char *their_branchname)
+{
+	git_buf our_refname = GIT_BUF_INIT;
+	git_buf their_refname = GIT_BUF_INIT;
+	git_reference *our_ref;
+	git_reference *their_ref;
+	git_annotated_commit *their_head;
+
+	if (our_branchname != NULL) {
+		cl_git_pass(git_buf_printf(&our_refname, "%s%s", GIT_REFS_HEADS_DIR, our_branchname));
+		cl_git_pass(git_reference_lookup(&our_ref, repo, git_buf_cstr(&our_refname)));
+	} else {
+		cl_git_pass(git_reference_lookup(&our_ref, repo, GIT_HEAD_FILE));
+	}
+
+	cl_git_pass(git_buf_printf(&their_refname, "%s%s", GIT_REFS_HEADS_DIR, their_branchname));
+
+	cl_git_pass(git_reference_lookup(&their_ref, repo, git_buf_cstr(&their_refname)));
+	cl_git_pass(git_annotated_commit_from_ref(&their_head, repo, their_ref));
+
+	cl_git_pass(git_merge_analysis_for_ref(merge_analysis, merge_pref, repo, our_ref, (const git_annotated_commit **)&their_head, 1));
+
+	git_buf_dispose(&our_refname);
+	git_buf_dispose(&their_refname);
+	git_annotated_commit_free(their_head);
+	git_reference_free(our_ref);
+	git_reference_free(their_ref);
+}
+
+void testimpl_merge_analysis__fastforward(void)
+{
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NULL, FASTFORWARD_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL|GIT_MERGE_ANALYSIS_FASTFORWARD, merge_analysis);
+}
+
+void testimpl_merge_analysis__no_fastforward(void)
+{
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NULL, NOFASTFORWARD_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL, merge_analysis);
+}
+
+void testimpl_merge_analysis__uptodate(void)
+{
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NULL, UPTODATE_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_UP_TO_DATE, merge_analysis);
+}
+
+void testimpl_merge_analysis__uptodate_merging_prev_commit(void)
+{
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NULL, PREVIOUS_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_UP_TO_DATE, merge_analysis);
+}
+
+void testimpl_merge_analysis__unborn(void)
+{
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+	git_buf master = GIT_BUF_INIT;
+
+	cl_git_pass(git_buf_joinpath(&master, git_repository_path(repo), "refs/heads/master"));
+	p_unlink(git_buf_cstr(&master));
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NULL, NOFASTFORWARD_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_FASTFORWARD|GIT_MERGE_ANALYSIS_UNBORN, merge_analysis);
+
+	git_buf_dispose(&master);
+}
+
+void testimpl_merge_analysis__fastforward_with_config_noff(void)
+{
+	git_config *config;
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	cl_git_pass(git_repository_config(&config, repo));
+	cl_git_pass(git_config_set_string(config, "merge.ff", "false"));
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NULL, FASTFORWARD_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL|GIT_MERGE_ANALYSIS_FASTFORWARD, merge_analysis);
+
+	cl_assert_equal_i(GIT_MERGE_PREFERENCE_NO_FASTFORWARD, (merge_pref & GIT_MERGE_PREFERENCE_NO_FASTFORWARD));
+
+	git_config_free(config);
+}
+
+void testimpl_merge_analysis__no_fastforward_with_config_ffonly(void)
+{
+	git_config *config;
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	cl_git_pass(git_repository_config(&config, repo));
+	cl_git_pass(git_config_set_string(config, "merge.ff", "only"));
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NULL, NOFASTFORWARD_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL, merge_analysis);
+
+	cl_assert_equal_i(GIT_MERGE_PREFERENCE_FASTFORWARD_ONLY, (merge_pref & GIT_MERGE_PREFERENCE_FASTFORWARD_ONLY));
+
+	git_config_free(config);
+}
+
+void testimpl_merge_analysis__between_uptodate_refs(void)
+{
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	analysis_from_branch(&merge_analysis, &merge_pref, NOFASTFORWARD_BRANCH, PREVIOUS_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_UP_TO_DATE, merge_analysis);
+}
+
+void testimpl_merge_analysis__between_noff_refs(void)
+{
+	git_merge_analysis_t merge_analysis;
+	git_merge_preference_t merge_pref;
+
+	analysis_from_branch(&merge_analysis, &merge_pref, "branch", FASTFORWARD_BRANCH);
+	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL, merge_analysis);
+}
diff --git a/tests/merge/analysis.h b/tests/merge/analysis.h
new file mode 100644
index 0000000..f97e73e
--- /dev/null
+++ b/tests/merge/analysis.h
@@ -0,0 +1,16 @@
+#ifndef INCLUDE_cl_merge_analysis_h__
+#define INCLUDE_cl_merge_analysis_h__
+
+void testimpl_merge_analysis__initialize(git_repository *t_repo, git_index *t_repo_index);
+void testimpl_merge_analysis__cleanup(void);
+void testimpl_merge_analysis__fastforward(void);
+void testimpl_merge_analysis__no_fastforward(void);
+void testimpl_merge_analysis__uptodate(void);
+void testimpl_merge_analysis__uptodate_merging_prev_commit(void);
+void testimpl_merge_analysis__unborn(void);
+void testimpl_merge_analysis__fastforward_with_config_noff(void);
+void testimpl_merge_analysis__no_fastforward_with_config_ffonly(void);
+void testimpl_merge_analysis__between_uptodate_refs(void);
+void testimpl_merge_analysis__between_noff_refs(void);
+
+#endif
diff --git a/tests/merge/trees/analysis.c b/tests/merge/trees/analysis.c
new file mode 100644
index 0000000..ce61085
--- /dev/null
+++ b/tests/merge/trees/analysis.c
@@ -0,0 +1,87 @@
+/*
+NOTE: this is essentially duplicated from tests/merge/workdir/analysis.c
+You probably want to make changes to both files.
+*/
+
+#include "clar_libgit2.h"
+#include "git2/repository.h"
+#include "../analysis.h"
+
+static git_repository *repo;
+static git_repository *bare_repo;
+static git_index *repo_index;
+
+#define TEST_REPO_PATH "merge-resolve"
+#define TEST_INDEX_PATH TEST_REPO_PATH "/index"
+
+
+/* Fixture setup and teardown */
+void test_merge_trees_analysis__initialize(void)
+{
+	repo = cl_git_sandbox_init(TEST_REPO_PATH);
+
+	cl_git_pass(git_repository_open_ext(&bare_repo, TEST_REPO_PATH "/.git", GIT_REPOSITORY_OPEN_BARE, NULL));
+
+	git_repository_index(&repo_index, bare_repo);
+
+	testimpl_merge_analysis__initialize(bare_repo, repo_index);
+}
+
+void test_merge_trees_analysis__cleanup(void)
+{
+	testimpl_merge_analysis__cleanup();
+
+	git_index_free(repo_index);
+	repo_index = NULL;
+
+	git_repository_free(bare_repo);
+	bare_repo = NULL;
+
+	cl_git_sandbox_cleanup();
+	repo = NULL;
+}
+
+void test_merge_trees_analysis__fastforward(void)
+{
+	testimpl_merge_analysis__fastforward();
+}
+
+void test_merge_trees_analysis__no_fastforward(void)
+{
+	testimpl_merge_analysis__no_fastforward();
+}
+
+void test_merge_trees_analysis__uptodate(void)
+{
+	testimpl_merge_analysis__uptodate();
+}
+
+void test_merge_trees_analysis__uptodate_merging_prev_commit(void)
+{
+	testimpl_merge_analysis__uptodate_merging_prev_commit();
+}
+
+void test_merge_trees_analysis__unborn(void)
+{
+	testimpl_merge_analysis__unborn();
+}
+
+void test_merge_trees_analysis__fastforward_with_config_noff(void)
+{
+	testimpl_merge_analysis__fastforward_with_config_noff();
+}
+
+void test_merge_trees_analysis__no_fastforward_with_config_ffonly(void)
+{
+	testimpl_merge_analysis__no_fastforward_with_config_ffonly();
+}
+
+void test_merge_trees_analysis__between_uptodate_refs(void)
+{
+	testimpl_merge_analysis__between_uptodate_refs();
+}
+
+void test_merge_trees_analysis__between_noff_refs(void)
+{
+	testimpl_merge_analysis__between_noff_refs();
+}
diff --git a/tests/merge/workdir/analysis.c b/tests/merge/workdir/analysis.c
index 27d7dba..08158f8 100644
--- a/tests/merge/workdir/analysis.c
+++ b/tests/merge/workdir/analysis.c
@@ -1,12 +1,11 @@
+/*
+NOTE: this is essentially duplicated with tests/merge/trees/analysis.c
+You probably want to make changes to both files.
+*/
+
 #include "clar_libgit2.h"
 #include "git2/repository.h"
-#include "git2/merge.h"
-#include "git2/annotated_commit.h"
-#include "git2/sys/index.h"
-#include "merge.h"
-#include "../merge_helpers.h"
-#include "refs.h"
-#include "posix.h"
+#include "../analysis.h"
 
 static git_repository *repo;
 static git_index *repo_index;
@@ -14,157 +13,68 @@ static git_index *repo_index;
 #define TEST_REPO_PATH "merge-resolve"
 #define TEST_INDEX_PATH TEST_REPO_PATH "/.git/index"
 
-#define UPTODATE_BRANCH			"master"
-#define PREVIOUS_BRANCH			"previous"
-
-#define FASTFORWARD_BRANCH		"ff_branch"
-#define FASTFORWARD_ID			"fd89f8cffb663ac89095a0f9764902e93ceaca6a"
-
-#define NOFASTFORWARD_BRANCH	"branch"
-#define NOFASTFORWARD_ID		"7cb63eed597130ba4abb87b3e544b85021905520"
-
 
 /* Fixture setup and teardown */
 void test_merge_workdir_analysis__initialize(void)
 {
 	repo = cl_git_sandbox_init(TEST_REPO_PATH);
 	git_repository_index(&repo_index, repo);
+
+	testimpl_merge_analysis__initialize(repo, repo_index);
 }
 
 void test_merge_workdir_analysis__cleanup(void)
 {
+	testimpl_merge_analysis__cleanup();
+
 	git_index_free(repo_index);
-	cl_git_sandbox_cleanup();
-}
+	repo_index = NULL;
 
-static void analysis_from_branch(
-	git_merge_analysis_t *merge_analysis,
-	git_merge_preference_t *merge_pref,
-	const char *our_branchname,
-	const char *their_branchname)
-{
-	git_buf our_refname = GIT_BUF_INIT;
-	git_buf their_refname = GIT_BUF_INIT;
-	git_reference *our_ref;
-	git_reference *their_ref;
-	git_annotated_commit *their_head;
-
-	if (our_branchname != NULL) {
-		cl_git_pass(git_buf_printf(&our_refname, "%s%s", GIT_REFS_HEADS_DIR, our_branchname));
-		cl_git_pass(git_reference_lookup(&our_ref, repo, git_buf_cstr(&our_refname)));
-	} else {
-		cl_git_pass(git_reference_lookup(&our_ref, repo, GIT_HEAD_FILE));
-	}
-
-	cl_git_pass(git_buf_printf(&their_refname, "%s%s", GIT_REFS_HEADS_DIR, their_branchname));
-
-	cl_git_pass(git_reference_lookup(&their_ref, repo, git_buf_cstr(&their_refname)));
-	cl_git_pass(git_annotated_commit_from_ref(&their_head, repo, their_ref));
-
-	cl_git_pass(git_merge_analysis_for_ref(merge_analysis, merge_pref, repo, our_ref, (const git_annotated_commit **)&their_head, 1));
-
-	git_buf_dispose(&our_refname);
-	git_buf_dispose(&their_refname);
-	git_annotated_commit_free(their_head);
-	git_reference_free(our_ref);
-	git_reference_free(their_ref);
+	cl_git_sandbox_cleanup();
+	repo = NULL;
 }
 
 void test_merge_workdir_analysis__fastforward(void)
 {
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NULL, FASTFORWARD_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL|GIT_MERGE_ANALYSIS_FASTFORWARD, merge_analysis);
+	testimpl_merge_analysis__fastforward();
 }
 
 void test_merge_workdir_analysis__no_fastforward(void)
 {
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NULL, NOFASTFORWARD_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL, merge_analysis);
+	testimpl_merge_analysis__no_fastforward();
 }
 
 void test_merge_workdir_analysis__uptodate(void)
 {
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NULL, UPTODATE_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_UP_TO_DATE, merge_analysis);
+	testimpl_merge_analysis__uptodate();
 }
 
 void test_merge_workdir_analysis__uptodate_merging_prev_commit(void)
 {
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NULL, PREVIOUS_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_UP_TO_DATE, merge_analysis);
+	testimpl_merge_analysis__uptodate_merging_prev_commit();
 }
 
 void test_merge_workdir_analysis__unborn(void)
 {
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-	git_buf master = GIT_BUF_INIT;
-
-	git_buf_joinpath(&master, git_repository_path(repo), "refs/heads/master");
-	p_unlink(git_buf_cstr(&master));
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NULL, NOFASTFORWARD_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_FASTFORWARD|GIT_MERGE_ANALYSIS_UNBORN, merge_analysis);
-
-	git_buf_dispose(&master);
+	testimpl_merge_analysis__unborn();
 }
 
 void test_merge_workdir_analysis__fastforward_with_config_noff(void)
 {
-	git_config *config;
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	git_repository_config(&config, repo);
-	git_config_set_string(config, "merge.ff", "false");
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NULL, FASTFORWARD_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL|GIT_MERGE_ANALYSIS_FASTFORWARD, merge_analysis);
-
-	cl_assert_equal_i(GIT_MERGE_PREFERENCE_NO_FASTFORWARD, (merge_pref & GIT_MERGE_PREFERENCE_NO_FASTFORWARD));
+	testimpl_merge_analysis__fastforward_with_config_noff();
 }
 
 void test_merge_workdir_analysis__no_fastforward_with_config_ffonly(void)
 {
-	git_config *config;
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	git_repository_config(&config, repo);
-	git_config_set_string(config, "merge.ff", "only");
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NULL, NOFASTFORWARD_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL, merge_analysis);
-
-	cl_assert_equal_i(GIT_MERGE_PREFERENCE_FASTFORWARD_ONLY, (merge_pref & GIT_MERGE_PREFERENCE_FASTFORWARD_ONLY));
+	testimpl_merge_analysis__no_fastforward_with_config_ffonly();
 }
 
 void test_merge_workdir_analysis__between_uptodate_refs(void)
 {
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	analysis_from_branch(&merge_analysis, &merge_pref, NOFASTFORWARD_BRANCH, PREVIOUS_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_UP_TO_DATE, merge_analysis);
+	testimpl_merge_analysis__between_uptodate_refs();
 }
 
 void test_merge_workdir_analysis__between_noff_refs(void)
 {
-	git_merge_analysis_t merge_analysis;
-	git_merge_preference_t merge_pref;
-
-	analysis_from_branch(&merge_analysis, &merge_pref, "branch", FASTFORWARD_BRANCH);
-	cl_assert_equal_i(GIT_MERGE_ANALYSIS_NORMAL, merge_analysis);
+	testimpl_merge_analysis__between_noff_refs();
 }