Add module identity and outcome primitives

outcome_test.go

@@ -0,0 +1,40 @@
+package commandkit
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestOutcomeConstructors(t *testing.T) {
+	cause := errors.New("operation failed")
+	tests := []struct {
+		name      string
+		got       Outcome
+		kind      OutcomeKind
+		status    int
+		domain    string
+		wantCause error
+	}{
+		{name: "success", got: Success(), kind: OutcomeSuccess, status: 0},
+		{name: "usage", got: Usage(cause), kind: OutcomeUsage, status: 2, wantCause: cause},
+		{name: "failure", got: Failure(cause), kind: OutcomeOperational, status: 1, wantCause: cause},
+		{name: "domain", got: Domain("record", 7, cause), kind: OutcomeDomain, status: 7, domain: "record", wantCause: cause},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if test.got.Kind != test.kind {
+				t.Fatalf("Kind = %q, want %q", test.got.Kind, test.kind)
+			}
+			if test.got.Status != test.status {
+				t.Fatalf("Status = %d, want %d", test.got.Status, test.status)
+			}
+			if test.got.Cause != test.wantCause {
+				t.Fatalf("Cause = %v, want original cause %v", test.got.Cause, test.wantCause)
+			}
+			if test.got.Domain != test.domain {
+				t.Fatalf("Domain = %q, want %q", test.got.Domain, test.domain)
+			}
+		})
+	}
+}