Isolate pipeline configuration discovery

internal/app/commands_test.go

@@ -59,9 +59,10 @@ func TestExecuteValidCommands(t *testing.T) {
 
 func TestExecuteMissingRequiredFlags(t *testing.T) {
 	cases := []struct {
-		name string
-		args []string
-		want string
+		name                string
+		args                []string
+		want                string
+		controlledDiscovery bool
 	}{
 		{name: "run missing session", args: []string{"run"}, want: "run: session_id is required"},
 		{name: "plan old top-level removed", args: []string{"plan"}, want: `unknown command: "plan"`},
@@ -69,7 +70,7 @@ func TestExecuteMissingRequiredFlags(t *testing.T) {
 		{name: "resume removed", args: []string{"resume"}, want: `unknown command: "resume"`},
 		{name: "run-stage missing name", args: []string{"run-stage", "--config", "a", "--session", "b"}, want: "run-stage: expected stage name and session_id"},
 		{name: "run-stage missing session", args: []string{"run-stage", "polish"}, want: "run-stage: expected stage name and session_id"},
-		{name: "run missing config uses defaults", args: []string{"run", "2026-05-03", "--session", "session.yml"}, want: "run: no pipeline config path provided and no default pipeline config found; searched:"},
+		{name: "run missing config uses defaults", args: []string{"run", "2026-05-03", "--session", "session.yml"}, want: "run: no pipeline config path provided", controlledDiscovery: true},
 	}
 
 	for _, tc := range cases {
@@ -77,7 +78,13 @@ func TestExecuteMissingRequiredFlags(t *testing.T) {
 			var stdout bytes.Buffer
 			var stderr bytes.Buffer
 
-			code := Execute(tc.args, &stdout, &stderr)
+			deps := commandDependencies{}
+			executor := pipelineExecutor(executePlan)
+			missingPath := ""
+			if tc.controlledDiscovery {
+				deps, missingPath, executor = guardedMissingPipelineDiscovery(t)
+			}
+			code := executeWithDependencies(tc.args, &stdout, &stderr, deps, executor)
 			if code == 0 {
 				t.Fatalf("exit code = 0, want non-zero")
 			}
@@ -87,6 +94,11 @@ func TestExecuteMissingRequiredFlags(t *testing.T) {
 			if !strings.Contains(stderr.String(), tc.want) {
 				t.Fatalf("stderr = %q, want to contain %q", stderr.String(), tc.want)
 			}
+			if tc.controlledDiscovery {
+				if got := stderr.String(); !strings.Contains(got, "no default pipeline config found") || !strings.Contains(got, missingPath) {
+					t.Fatalf("stderr = %q, want controlled searched path %q", got, missingPath)
+				}
+			}
 		})
 	}
 }