add test for unmarshal

Signed-off-by: Ashutosh Kumar <sonasingh46@gmail.com>

Author: sonasingh46

types/nullable_test.go

@@ -405,3 +405,58 @@ func TestNullable_MarshalJSON(t *testing.T) {
 		})
 	}
 }
+
+func TestNullable_UnmarshalJSON(t *testing.T) {
+	type testCase struct {
+		name   string
+		json   []byte
+		assert func(obj SimpleInt, t *testing.T)
+	}
+	tests := []testCase{
+		{
+			name: "when not set",
+			json: []byte(`{}`),
+			assert: func(obj SimpleInt, t *testing.T) {
+				assert.Equalf(t, false, obj.ReplicaCount.Set, "replica count should not be set")
+				assert.Equalf(t, false, obj.ReplicaCount.Null, "replica count should not be null")
+			},
+		},
+
+		{
+			name: "when explicity set to zero value",
+			json: []byte(`{"replicaCount":0}`),
+			assert: func(obj SimpleInt, t *testing.T) {
+				assert.Equalf(t, true, obj.ReplicaCount.Set, "replica count should be set")
+				assert.Equalf(t, false, obj.ReplicaCount.Null, "replica count should not be null")
+				assert.Equalf(t, 0, obj.ReplicaCount.Value, "replica count value should be 0l")
+			},
+		},
+
+		{
+			name: "when explicity set to null value",
+			json: []byte(`{"replicaCount":null}`),
+			assert: func(obj SimpleInt, t *testing.T) {
+				assert.Equalf(t, true, obj.ReplicaCount.Set, "replica count should be set")
+				assert.Equalf(t, true, obj.ReplicaCount.Null, "replica count should be null")
+			},
+		},
+
+		{
+			name: "when explicity set to a specific value",
+			json: []byte(`{"replicaCount":5}`),
+			assert: func(obj SimpleInt, t *testing.T) {
+				assert.Equalf(t, true, obj.ReplicaCount.Set, "replica count should be set")
+				assert.Equalf(t, false, obj.ReplicaCount.Null, "replica count should not be null")
+				assert.Equalf(t, 5, obj.ReplicaCount.Value, "replica count value should be 0l")
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var obj SimpleInt
+			err := json.Unmarshal(tt.json, &obj)
+			require.NoError(t, err)
+			tt.assert(obj, t)
+		})
+	}
+}