test(beads): add unit test for Init args to cover --server flag

Extract initArgs() from Init() so the argument-building logic can be
tested without a running Dolt server. Covers the Codecov-flagged line
where --server is appended when serverPort > 0.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mikeakers

internal/beads/beads.go

@@ -391,11 +391,8 @@ func (b *Beads) getResolvedBeadsDir() string {
 	return ResolveBeadsDir(b.workDir)
 }
 
-// Init initializes a new beads database in the working directory.
-// This uses the same environment isolation as other commands.
-// If ServerPort is set (via NewIsolatedWithPort), passes --server-port to bd init
-// so the database is created on the test Dolt server.
-func (b *Beads) Init(prefix string) error {
+// initArgs builds the argument list for bd init.
+func (b *Beads) initArgs(prefix string) []string {
 	args := []string{"init"}
 	if prefix != "" {
 		args = append(args, "--prefix", prefix)
@@ -404,7 +401,15 @@ func (b *Beads) Init(prefix string) error {
 	if b.serverPort > 0 {
 		args = append(args, "--server", "--server-port", fmt.Sprintf("%d", b.serverPort))
 	}
-	_, err := b.run(args...)
+	return args
+}
+
+// Init initializes a new beads database in the working directory.
+// This uses the same environment isolation as other commands.
+// If ServerPort is set (via NewIsolatedWithPort), passes --server-port to bd init
+// so the database is created on the test Dolt server.
+func (b *Beads) Init(prefix string) error {
+	_, err := b.run(b.initArgs(prefix)...)
 	return err
 }
 

internal/beads/beads_test.go

@@ -2820,6 +2820,45 @@ func TestNewIsolatedWithPort(t *testing.T) {
 	}
 }
 
+func TestInitArgs(t *testing.T) {
+	tests := []struct {
+		name       string
+		prefix     string
+		serverPort int
+		want       []string
+	}{
+		{
+			name:   "no prefix no port",
+			want:   []string{"init", "--quiet"},
+		},
+		{
+			name:   "with prefix",
+			prefix: "myrig",
+			want:   []string{"init", "--prefix", "myrig", "--quiet"},
+		},
+		{
+			name:       "with server port",
+			prefix:     "myrig",
+			serverPort: 13307,
+			want:       []string{"init", "--prefix", "myrig", "--quiet", "--server", "--server-port", "13307"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			b := &Beads{serverPort: tt.serverPort}
+			got := b.initArgs(tt.prefix)
+			if len(got) != len(tt.want) {
+				t.Fatalf("initArgs() = %v, want %v", got, tt.want)
+			}
+			for i := range got {
+				if got[i] != tt.want[i] {
+					t.Fatalf("initArgs()[%d] = %q, want %q\nfull: %v", i, got[i], tt.want[i], got)
+				}
+			}
+		})
+	}
+}
+
 // ---------------------------------------------------------------------------
 // stripEnvPrefixes tests (refactored from runWithRouting inline logic)
 // ---------------------------------------------------------------------------