Add tests for the webhook event decoders

model/events_test.go

@@ -0,0 +1,120 @@
+package model_test
+
+import (
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/cpanato/github_actions_exporter/model"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_PingEventFromJSON(t *testing.T) {
+	event := model.PingEventFromJSON(strings.NewReader(`{"zen": "Keep it logically awesome.", "hook_id": 42}`))
+
+	require.NotNil(t, event)
+	assert.Equal(t, int64(42), event.GetHookID())
+	assert.Equal(t, "Keep it logically awesome.", event.GetZen())
+}
+
+func Test_CheckRunEventFromJSON(t *testing.T) {
+	event := model.CheckRunEventFromJSON(strings.NewReader(`{
+		"action": "completed",
+		"check_run": {"name": "build", "status": "completed", "conclusion": "success"},
+		"repository": {"name": "repo", "owner": {"login": "org"}}
+	}`))
+
+	require.NotNil(t, event)
+	assert.Equal(t, "completed", event.GetAction())
+	assert.Equal(t, "build", event.GetCheckRun().GetName())
+	assert.Equal(t, "success", event.GetCheckRun().GetConclusion())
+	assert.Equal(t, "repo", event.GetRepo().GetName())
+	assert.Equal(t, "org", event.GetRepo().GetOwner().GetLogin())
+}
+
+func Test_WorkflowJobEventFromJSON(t *testing.T) {
+	event := model.WorkflowJobEventFromJSON(strings.NewReader(`{
+		"action": "completed",
+		"workflow_job": {
+			"id": 1,
+			"run_id": 2,
+			"name": "Test",
+			"head_branch": "main",
+			"runner_group_name": "default",
+			"workflow_name": "CI",
+			"status": "completed",
+			"conclusion": "success",
+			"started_at": "2026-10-09T10:00:00Z",
+			"completed_at": "2026-10-09T10:05:00Z"
+		},
+		"repository": {"name": "repo", "owner": {"login": "org"}}
+	}`))
+
+	require.NotNil(t, event)
+	assert.Equal(t, "completed", event.GetAction())
+	assert.Equal(t, "org", event.GetRepo().GetOwner().GetLogin())
+	assert.Equal(t, "repo", event.GetRepo().GetName())
+
+	job := event.GetWorkflowJob()
+	assert.Equal(t, "Test", job.GetName())
+	assert.Equal(t, "main", job.GetHeadBranch())
+	assert.Equal(t, "default", job.GetRunnerGroupName())
+	assert.Equal(t, "CI", job.GetWorkflowName())
+	assert.Equal(t, int64(2), job.GetRunID())
+	assert.Equal(t, "success", job.GetConclusion())
+	assert.Equal(t, 5*60.0, job.GetCompletedAt().Sub(job.GetStartedAt().Time).Seconds())
+}
+
+func Test_WorkflowRunEventFromJSON(t *testing.T) {
+	event := model.WorkflowRunEventFromJSON(strings.NewReader(`{
+		"action": "completed",
+		"workflow": {"name": "CI"},
+		"workflow_run": {
+			"head_branch": "main",
+			"run_number": 7,
+			"status": "completed",
+			"conclusion": "failure",
+			"run_started_at": "2026-10-09T10:00:00Z",
+			"updated_at": "2026-10-09T10:10:00Z"
+		},
+		"repository": {"name": "repo", "owner": {"login": "org"}}
+	}`))
+
+	require.NotNil(t, event)
+	assert.Equal(t, "completed", event.GetAction())
+	assert.Equal(t, "CI", event.GetWorkflow().GetName())
+	assert.Equal(t, "org", event.GetRepo().GetOwner().GetLogin())
+	assert.Equal(t, "repo", event.GetRepo().GetName())
+
+	run := event.GetWorkflowRun()
+	assert.Equal(t, "main", run.GetHeadBranch())
+	assert.Equal(t, 7, run.GetRunNumber())
+	assert.Equal(t, "failure", run.GetConclusion())
+}
+
+// Invalid input must give a nil event, never a half decoded one.
+func Test_EventsFromJSON_InvalidInput(t *testing.T) {
+	decoders := map[string]func(io.Reader) any{
+		"ping":         func(r io.Reader) any { return model.PingEventFromJSON(r) },
+		"check_run":    func(r io.Reader) any { return model.CheckRunEventFromJSON(r) },
+		"workflow_job": func(r io.Reader) any { return model.WorkflowJobEventFromJSON(r) },
+		"workflow_run": func(r io.Reader) any { return model.WorkflowRunEventFromJSON(r) },
+	}
+	inputs := map[string]string{
+		"empty body":     "",
+		"not json":       "not json",
+		"truncated json": `{"action": "comp`,
+		"wrong type":     `{"action": 42, "hook_id": "not a number"}`,
+		"json array":     `[]`,
+	}
+
+	for decoderName, decode := range decoders {
+		for inputName, input := range inputs {
+			t.Run(decoderName+"/"+inputName, func(t *testing.T) {
+				// A typed nil pointer boxed in an interface is not == nil, so check through assert.
+				assert.Nil(t, decode(strings.NewReader(input)))
+			})
+		}
+	}
+}