diff --git a/README.md b/README.md
index f69dd2b..f7492f0 100644
--- a/README.md
+++ b/README.md
@@ -10,35 +10,36 @@ Then you can check the functions of `joj3` with the `make test`. The cases used
 
 ```bash
 $ make test
-go test -v ./...
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/cmd/dummy [no test files]
+go test -coverprofile cover.out -v ./...
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/cmd/dummy         coverage: 0.0% of statements
 ?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/executors        [no test files]
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/executors/dummy  [no test files]
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/parsers/dummy    [no test files]
 ?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/parsers  [no test files]
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/parsers/diff     [no test files]
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/executors/sandbox        [no test files]
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/parsers/resultstatus     [no test files]
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/stage    [no test files]
-?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/pkg/dummy [no test files]
 ?       focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/pkg/healthcheck   [no test files]
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/executors/sandbox                coverage: 0.0% of statements
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/executors/dummy          coverage: 0.0% of statements
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/parsers/diff             coverage: 0.0% of statements
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/pkg/dummy         coverage: 0.0% of statements
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/stage            coverage: 0.0% of statements
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/parsers/dummy            coverage: 0.0% of statements
+        focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/parsers/resultstatus             coverage: 0.0% of statements
 === RUN   TestMain
-=== RUN   TestMain/success
-    main_test.go:96: stageResults: [{Name:compile Results:[{Score:0 Comment:}]} {Name:run Results:[{Score:100 Comment:executor status: run time: 1910200 ns, memory: 13529088 bytes} {Score:100 Comment:executor status: run time: 1703000 ns, memory: 15536128 bytes}]}]
-=== RUN   TestMain/compile_error
-    main_test.go:96: stageResults: [{Name:compile Results:[{Score:0 Comment:Unexpected executor status: Nonzero Exit Status.}]}]
-=== RUN   TestMain/dummy
-    main_test.go:96: stageResults: [{Name:dummy Results:[{Score:110 Comment:dummy comment + comment from toml conf}]}]
-=== RUN   TestMain/dummy_error
-    main_test.go:96: stageResults: [{Name:dummy Results:[{Score:0 Comment:Unexpected executor status: Nonzero Exit Status.
+=== RUN   TestMain/compile/success
+    main_test.go:101: stageResults: [{Name:compile Results:[{Score:0 Comment:}]} {Name:run Results:[{Score:100 Comment:executor status: run time: 1867950 ns, memory: 10813440 bytes} {Score:100 Comment:executor status: run time: 1948947 ns, memory: 10813440 bytes}]}]
+=== RUN   TestMain/compile/error
+    main_test.go:101: stageResults: [{Name:compile Results:[{Score:0 Comment:Unexpected executor status: Nonzero Exit Status.}]}]
+=== RUN   TestMain/dummy/success
+    main_test.go:101: stageResults: [{Name:dummy Results:[{Score:110 Comment:dummy comment + comment from toml conf}]}]
+=== RUN   TestMain/dummy/error
+    main_test.go:101: stageResults: [{Name:dummy Results:[{Score:0 Comment:Unexpected executor status: Nonzero Exit Status.
         Stderr: dummy negative score: -1}]}]
---- PASS: TestMain (0.29s)
-    --- PASS: TestMain/success (0.27s)
-    --- PASS: TestMain/compile_error (0.01s)
-    --- PASS: TestMain/dummy (0.01s)
-    --- PASS: TestMain/dummy_error (0.01s)
+--- PASS: TestMain (0.39s)
+    --- PASS: TestMain/compile/success (0.36s)
+    --- PASS: TestMain/compile/error (0.01s)
+    --- PASS: TestMain/dummy/success (0.02s)
+    --- PASS: TestMain/dummy/error (0.01s)
 PASS
-ok      focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/cmd/joj3  0.295s
+coverage: 68.5% of statements
+ok      focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/cmd/joj3  0.403s  coverage: 68.5% of statements
 ```
 
 ### For developers