Merge pull request #3 from minoritea/ci

add CI testing

Author: minoritea

.github/workflows/test.yml

@@ -0,0 +1,16 @@
+name: Test
+
+on:
+  push:
+    branches: main
+  pull_request:
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v2
+      - run: |
+          go version
+          go mod download
+          go test

parser.go

@@ -104,7 +104,7 @@ func GetPackages(out string) Packages {
 	sort.Slice(packages, func(i, j int) bool {
 		cmp := len(packages[i].Tests) - len(packages[j].Tests)
 		if cmp != 0 {
-			return cmp < 0
+			return cmp > 0
 		}
 		return strings.Compare(packages[i].Name, packages[j].Name) < 0
 	})

run_test.go

@@ -0,0 +1,50 @@
+package splittestgen_test
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func TestRun(t *testing.T) {
+	const total = 3
+	for _, c := range []struct {
+		index    int
+		expected string
+	}{
+		{
+			index:    0,
+			expected: "go test github.com/minoritea/go-splittestgen/testdata/group1 -run '^(?:Test1|Test2)$'",
+		},
+		{
+			index:    1,
+			expected: "go test github.com/minoritea/go-splittestgen/testdata/group1 -run '^(?:Test3|Test4)$'",
+		},
+		{
+			index:    2,
+			expected: "go test github.com/minoritea/go-splittestgen/testdata/group2 -run '^(?:TestCases)$'",
+		},
+	} {
+		index, expected := c.index, c.expected
+		t.Run(fmt.Sprintf("case-of-index-%d", index), func(t *testing.T) {
+			t.Parallel()
+			output, err := exec.Command(
+				"sh", "-c", fmt.Sprintf(` \
+				  (cd testdata && go test ./... -list .) | \
+					go run ./cmd/go-splittestgen -index %d -total %d \
+				`, index, total),
+			).CombinedOutput()
+
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if strings.TrimSpace(string(output)) != expected {
+				t.Log("The actual output is\n", string(output))
+				t.Log("The expected output is\n", expected)
+				t.Fatal("The command output is not equal to the expected value")
+			}
+		})
+	}
+}

testdata/group1/group1_test.go

@@ -0,0 +1,8 @@
+package group1_test
+
+import "testing"
+
+func Test1(t *testing.T) { t.Log("OK") }
+func Test2(t *testing.T) { t.Log("Also OK") }
+func Test3(t *testing.T) { t.Log("Also OK") }
+func Test4(t *testing.T) { t.Log("Also OK") }

testdata/group2/group2_test.go

@@ -0,0 +1,11 @@
+package group2_test
+
+import "testing"
+
+func TestMain(m *testing.M) { m.Run() }
+func TestCases(t *testing.T) {
+	cases := []string{"A", "B"}
+	for _, name := range cases {
+		t.Run("case-"+name, func(t *testing.T) { t.Logf("Case %s is OK", name) })
+	}
+}