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import ( "strings" "testing" "time"
"github.com/bluekeyes/go-gitdiff/gitdiff" "github.com/go-git/go-git/v5/plumbing" "github.com/go-git/go-git/v5/plumbing/object" "tangled.org/core/types")
// parseDiff is a test helper that parses a unified diff string into gitdiff.TextFragment slices.func parseDiff(t *testing.T, src string) []*gitdiff.File { t.Helper() files, _, err := gitdiff.Parse(strings.NewReader(src)) if err != nil { t.Fatalf("gitdiff.Parse: %v", err) } return files}
// niceDiffFromParsed builds a NiceDiff from parsed gitdiff.File entries, mirroring// what the knotserver does in git.Diff().func niceDiffFromParsed(files []*gitdiff.File, commit types.Commit, stat types.DiffStat) *types.NiceDiff { nd := &types.NiceDiff{Commit: commit, Stat: stat} for _, f := range files { d := types.Diff{ IsBinary: f.IsBinary, IsNew: f.IsNew, IsDelete: f.IsDelete, IsCopy: f.IsCopy, IsRename: f.IsRename, } d.Name.Old = f.OldName d.Name.New = f.NewName for _, tf := range f.TextFragments { d.TextFragments = append(d.TextFragments, *tf) } nd.Diff = append(nd.Diff, d) } return nd}
func TestRenderUnifiedDiff_nil(t *testing.T) { if got := renderUnifiedDiff(nil); got != "" { t.Errorf("expected empty string for nil NiceDiff, got %q", got) }}
func TestRenderUnifiedDiff_modified(t *testing.T) { const src = `diff --git a/foo.go b/foo.go--- a/foo.go+++ b/foo.go@@ -1,3 +1,3 @@ package main-// old comment+// new comment func main() {}` files := parseDiff(t, src) nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{}) got := renderUnifiedDiff(nd)
checks := []string{ "diff --git a/foo.go b/foo.go\n", "--- a/foo.go\n", "+++ b/foo.go\n", "@@ -1,3 +1,3 @@", "-// old comment\n", "+// new comment\n", } for _, want := range checks { if !strings.Contains(got, want) { t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got) } }}
func TestRenderUnifiedDiff_newFile(t *testing.T) { const src = `diff --git a/new.go b/new.gonew file mode 100644--- /dev/null+++ b/new.go@@ -0,0 +1,2 @@+package main+func main() {}` files := parseDiff(t, src) nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{}) got := renderUnifiedDiff(nd)
checks := []string{ "diff --git a/new.go b/new.go\n", "new file mode 100644\n", "--- /dev/null\n", "+++ b/new.go\n", "+package main\n", } for _, want := range checks { if !strings.Contains(got, want) { t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got) } }}
func TestRenderUnifiedDiff_deletedFile(t *testing.T) { const src = `diff --git a/old.go b/old.godeleted file mode 100644--- a/old.go+++ /dev/null@@ -1,2 +0,0 @@-package main-func main() {}` files := parseDiff(t, src) nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{}) got := renderUnifiedDiff(nd)
checks := []string{ "diff --git a/old.go b/old.go\n", "deleted file mode 100644\n", "--- a/old.go\n", "+++ /dev/null\n", "-package main\n", } for _, want := range checks { if !strings.Contains(got, want) { t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got) } }}
func TestRenderUnifiedDiff_renamedFile(t *testing.T) { const src = `diff --git a/old.go b/renamed.gorename from old.gorename to renamed.go--- a/old.go+++ b/renamed.go@@ -1,2 +1,2 @@ package main-func old() {}+func renamed() {}` files := parseDiff(t, src) nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{}) got := renderUnifiedDiff(nd)
checks := []string{ "diff --git a/old.go b/renamed.go\n", "rename from old.go\n", "rename to renamed.go\n", "--- a/old.go\n", "+++ b/renamed.go\n", } for _, want := range checks { if !strings.Contains(got, want) { t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got) } }}
func TestRenderUnifiedDiff_multipleFiles(t *testing.T) { const src = `diff --git a/a.go b/a.go--- a/a.go+++ b/a.go@@ -1,1 +1,1 @@-old a+new adiff --git a/b.go b/b.go--- a/b.go+++ b/b.go@@ -1,1 +1,1 @@-old b+new b` files := parseDiff(t, src) nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{}) got := renderUnifiedDiff(nd)
for _, want := range []string{"diff --git a/a.go b/a.go", "diff --git a/b.go b/b.go"} { if !strings.Contains(got, want) { t.Errorf("missing %q in output:\n%s", want, got) } }}
func TestRenderFormatPatch_nil(t *testing.T) { if got := renderFormatPatch(nil); got != "" { t.Errorf("expected empty string for nil NiceDiff, got %q", got) }}
func TestRenderFormatPatch_headers(t *testing.T) { when := time.Date(2024, 3, 15, 10, 30, 0, 0, time.UTC) hash := plumbing.NewHash("abc1234567890000000000000000000000000000")
nd := &types.NiceDiff{ Commit: types.Commit{ Hash: hash, Message: "Fix the bug\n\nThis patch resolves the long-standing issue.\n", Author: object.Signature{ Name: "Alice Dev", Email: "alice@example.com", When: when, }, }, Stat: types.DiffStat{FilesChanged: 1, Insertions: 2, Deletions: 1}, }
got := renderFormatPatch(nd)
checks := []string{ "From abc1234567890000000000000000000000000000 Mon Sep 17 00:00:00 2001\n", "From: Alice Dev <alice@example.com>\n", "Date: Fri, 15 Mar 2024 10:30:00 +0000\n", "Subject: [PATCH] Fix the bug\n", "This patch resolves the long-standing issue.\n", "---\n", " 1 file(s) changed, 2 insertion(s)(+), 1 deletion(s)(-)\n", "\n--\ntangled.sh\n", } for _, want := range checks { if !strings.Contains(got, want) { t.Errorf("renderFormatPatch output missing %q\ngot:\n%s", want, got) } }}
func TestRenderFormatPatch_subjectOnly(t *testing.T) { // Single-line message (no body) should not emit a blank body section. nd := &types.NiceDiff{ Commit: types.Commit{ Message: "Single line commit", Author: object.Signature{When: time.Now()}, }, } got := renderFormatPatch(nd)
if !strings.Contains(got, "Subject: [PATCH] Single line commit\n") { t.Errorf("missing subject in output:\n%s", got) } // Body should not appear between Subject and "---" parts := strings.SplitN(got, "---\n", 2) if len(parts) < 2 { t.Fatalf("expected '---' separator in output:\n%s", got) } beforeSep := parts[0] // Only the blank line between headers and body should be there, no extra content. afterSubject := strings.SplitN(beforeSep, "Subject: [PATCH] Single line commit\n", 2) if len(afterSubject) == 2 && strings.TrimSpace(afterSubject[1]) != "" { t.Errorf("unexpected body content before '---': %q", afterSubject[1]) }}
func TestRenderFormatPatch_containsDiff(t *testing.T) { const src = `diff --git a/foo.go b/foo.go--- a/foo.go+++ b/foo.go@@ -1,2 +1,2 @@ package main-// old+// new` files := parseDiff(t, src) nd := niceDiffFromParsed(files, types.Commit{ Author: object.Signature{When: time.Now()}, }, types.DiffStat{FilesChanged: 1, Insertions: 1, Deletions: 1})
got := renderFormatPatch(nd)
checks := []string{ "diff --git a/foo.go b/foo.go\n", "-// old\n", "+// new\n", " foo.go |", } for _, want := range checks { if !strings.Contains(got, want) { t.Errorf("renderFormatPatch output missing %q\ngot:\n%s", want, got) } }}