diff --git a/internal/plan/generate_test.go b/internal/plan/generate_test.go
new file mode 100644
index 0000000..c4b1946
--- /dev/null
+++ b/internal/plan/generate_test.go
@@ -0,0 +1,174 @@
+package plan_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/urunc-dev/evaluation_suite/internal/manifest"
+	"github.com/urunc-dev/evaluation_suite/internal/plan"
+)
+
+func TestGenerateDefaultTrialPerRuntime(t *testing.T) {
+	m := &manifest.Manifest{
+		Runtimes: []manifest.Runtime{
+			{Name: "runc", Handler: "io.containerd.runc.v2"},
+			{Name: "urunc", Handler: "io.containerd.urunc.v2"},
+		},
+		Experiments: map[string]manifest.Experiment{
+			"lifecycle": {
+				Workloads: manifest.Workloads{
+					Default: manifest.Workload{Image: "docker.io/library/nginx:latest"},
+				},
+			},
+		},
+	}
+
+	p, err := plan.Generate(m)
+	if err != nil {
+		t.Fatalf("Generate() error = %v", err)
+	}
+
+	if len(p.Trials) != 2 {
+		t.Fatalf("len(p.Trials) = %d; want 2", len(p.Trials))
+	}
+
+	if p.Trials[0].RuntimeName != "runc" || p.Trials[1].RuntimeName != "urunc" {
+		t.Fatalf("trials not sorted by runtime name: %+v", p.Trials)
+	}
+
+	if p.Trials[0].ID != "lifecycle-default-runc" {
+		t.Fatalf("Trials[0].ID = %q; want %q", p.Trials[0].ID, "lifecycle-default-runc")
+	}
+}
+
+func TestGenerateOtherWorkloadOverridesDefaultForItsRuntime(t *testing.T) {
+	m := &manifest.Manifest{
+		Runtimes: []manifest.Runtime{
+			{Name: "runc", Handler: "io.containerd.runc.v2"},
+			{Name: "urunc", Handler: "io.containerd.urunc.v2"},
+		},
+		Experiments: map[string]manifest.Experiment{
+			"lifecycle": {
+				Workloads: manifest.Workloads{
+					Default: manifest.Workload{Image: "docker.io/library/nginx:latest"},
+					Other: []manifest.Workload{
+						{Image: "docker.io/library/redis:latest", Runtime: "urunc"},
+					},
+				},
+			},
+		},
+	}
+
+	p, err := plan.Generate(m)
+	if err != nil {
+		t.Fatalf("Generate() error = %v", err)
+	}
+
+	if len(p.Trials) != 2 {
+		t.Fatalf("len(p.Trials) = %d; want 2, got %+v", len(p.Trials), p.Trials)
+	}
+
+	var sawDefaultRunc, sawOtherUrunc bool
+	for _, trial := range p.Trials {
+		if trial.RuntimeName == "runc" && trial.WorkloadName == "default" {
+			sawDefaultRunc = true
+		}
+		if trial.RuntimeName == "urunc" && trial.WorkloadName == "other-0" {
+			sawOtherUrunc = true
+			if trial.Image != "docker.io/library/redis:latest" {
+				t.Fatalf("other-0 trial image = %q; want redis image", trial.Image)
+			}
+		}
+		if trial.RuntimeName == "urunc" && trial.WorkloadName == "default" {
+			t.Fatalf("urunc should not get a default trial, it is overridden by other[0]")
+		}
+	}
+
+	if !sawDefaultRunc || !sawOtherUrunc {
+		t.Fatalf("missing expected trials: %+v", p.Trials)
+	}
+}
+
+func TestGenerateOtherWorkloadWithoutRuntimeAppliesToAll(t *testing.T) {
+	m := &manifest.Manifest{
+		Runtimes: []manifest.Runtime{
+			{Name: "runc", Handler: "io.containerd.runc.v2"},
+			{Name: "urunc", Handler: "io.containerd.urunc.v2"},
+		},
+		Experiments: map[string]manifest.Experiment{
+			"lifecycle": {
+				Workloads: manifest.Workloads{
+					Default: manifest.Workload{Image: "docker.io/library/nginx:latest"},
+					Other: []manifest.Workload{
+						{Image: "docker.io/library/redis:latest"},
+					},
+				},
+			},
+		},
+	}
+
+	p, err := plan.Generate(m)
+	if err != nil {
+		t.Fatalf("Generate() error = %v", err)
+	}
+
+	if len(p.Trials) != 4 {
+		t.Fatalf("len(p.Trials) = %d; want 4 (2 default + 2 other), got %+v", len(p.Trials), p.Trials)
+	}
+}
+
+func TestGenerateOtherWorkloadUnknownRuntimeErrors(t *testing.T) {
+	m := &manifest.Manifest{
+		Runtimes: []manifest.Runtime{
+			{Name: "runc", Handler: "io.containerd.runc.v2"},
+		},
+		Experiments: map[string]manifest.Experiment{
+			"lifecycle": {
+				Workloads: manifest.Workloads{
+					Default: manifest.Workload{Image: "docker.io/library/nginx:latest"},
+					Other: []manifest.Workload{
+						{Image: "docker.io/library/redis:latest", Runtime: "kata"},
+					},
+				},
+			},
+		},
+	}
+
+	_, err := plan.Generate(m)
+	if err == nil {
+		t.Fatal("Generate() error = nil; want error for unknown runtime reference")
+	}
+
+	if !strings.Contains(err.Error(), `unknown runtime "kata"`) {
+		t.Fatalf("Generate() error = %v; want it to mention unknown runtime kata", err)
+	}
+}
+
+func TestGenerateTrialIDIsSlugified(t *testing.T) {
+	m := &manifest.Manifest{
+		Runtimes: []manifest.Runtime{
+			{Name: "urunc", Handler: "io.containerd.urunc.v2"},
+		},
+		Experiments: map[string]manifest.Experiment{
+			"HTTP Readiness!": {
+				Workloads: manifest.Workloads{
+					Default: manifest.Workload{Image: "docker.io/library/nginx:latest"},
+				},
+			},
+		},
+	}
+
+	p, err := plan.Generate(m)
+	if err != nil {
+		t.Fatalf("Generate() error = %v", err)
+	}
+
+	if len(p.Trials) != 1 {
+		t.Fatalf("len(p.Trials) = %d; want 1", len(p.Trials))
+	}
+
+	want := "http-readiness-default-urunc"
+	if p.Trials[0].ID != want {
+		t.Fatalf("Trials[0].ID = %q; want %q", p.Trials[0].ID, want)
+	}
+}