3 files changed, 49 insertions, 1 deletions
diff --git a/job/job.go b/job/job.go
index e15b2eb..4241844 100644
--- a/job/job.go
+++ b/job/job.go
@@ -10,5 +10,5 @@ type Job struct {
 }
 
 func (job Job) String() string {
-	return fmt.Sprintf("Name: \"%s\", Timestamp: \"%d\", Success: \"%t\"", job.Name, job.Timestamp, job.Success)
+	return fmt.Sprintf("Job { Name: \"%s\", Timestamp: \"%d\", Success: \"%t\" }", job.Name, job.Timestamp, job.Success)
 }
diff --git a/job/job_test.go b/job/job_test.go
new file mode 100644
index 0000000..7420220
--- /dev/null
+++ b/job/job_test.go
@@ -0,0 +1,10 @@
+package job
+
+import "testing"
+
+func TestString(t *testing.T) {
+	j := Job{Name: "name", Timestamp: 10, Success: true}
+	if j.String() != "Job { Name: \"name\", Timestamp: \"10\", Success: \"true\" }" {
+		t.Errorf("test string error : %s", j.String())
+	}
+}
diff --git a/job/utils_test.go b/job/utils_test.go
new file mode 100644
index 0000000..8f7f013
--- /dev/null
+++ b/job/utils_test.go
@@ -0,0 +1,38 @@
+package job
+
+import "testing"
+
+func TestKeepOldestOnly(t *testing.T) {
+	t.Run("test empty list", func(t *testing.T) {
+		var jobs []Job
+		if len(KeepOldestOnly(jobs)) != 0 {
+			t.Error("empty list failed")
+		}
+	})
+	t.Run("test functionality", func(t *testing.T) {
+		var jobs []Job
+		jobs = append(jobs, Job{Name: "a", Timestamp: 10, Success: true})
+		jobs = append(jobs, Job{Name: "a", Timestamp: 20, Success: true})
+		jobs2 := KeepOldestOnly(jobs)
+		if len(jobs2) != 1 || jobs2[0].Timestamp != 20 {
+			t.Error("functionality failed")
+		}
+	})
+}
+
+func TestKeepSuccessOnly(t *testing.T) {
+	t.Run("test empty list", func(t *testing.T) {
+		var jobs []Job
+		if len(KeepSuccessOnly(jobs)) != 0 {
+			t.Error("empty list failed")
+		}
+	})
+	t.Run("test functionality", func(t *testing.T) {
+		var jobs []Job
+		jobs = append(jobs, Job{Name: "a", Timestamp: 10, Success: true})
+		jobs = append(jobs, Job{Name: "b", Timestamp: 20, Success: false})
+		if len(KeepSuccessOnly(jobs)) != 1 || jobs[0].Name != "a" {
+			t.Error("functionality failed")
+		}
+	})
+}