Add cli output handlers (#3660)

Co-authored-by: Anbraten <6918444+anbraten@users.noreply.github.com>

cli/output/table_test.go

@@ -0,0 +1,75 @@
+package output
+
+import (
+	"bytes"
+	"os"
+	"strings"
+	"testing"
+)
+
+type writerFlusherStub struct {
+	bytes.Buffer
+}
+
+func (s writerFlusherStub) Flush() error {
+	return nil
+}
+
+type testFieldsStruct struct {
+	Name   string
+	Number int
+}
+
+func TestTableOutput(t *testing.T) {
+	var wfs writerFlusherStub
+	to := NewTable(os.Stdout)
+	to.w = &wfs
+
+	t.Run("AddAllowedFields", func(t *testing.T) {
+		_, _ = to.AddAllowedFields(testFieldsStruct{})
+		if _, ok := to.allowedFields["name"]; !ok {
+			t.Error("name should be a allowed field")
+		}
+	})
+	t.Run("AddFieldAlias", func(t *testing.T) {
+		to.AddFieldAlias("woodpecker_ci", "woodpecker ci")
+		if alias, ok := to.fieldAlias["woodpecker_ci"]; !ok || alias != "woodpecker ci" {
+			t.Errorf("woodpecker_ci alias should be 'woodpecker ci', is: %v", alias)
+		}
+	})
+	t.Run("AddFieldOutputFn", func(t *testing.T) {
+		to.AddFieldFn("woodpecker ci", FieldFn(func(_ any) string {
+			return "WOODPECKER CI!!!"
+		}))
+		if _, ok := to.fieldMapping["woodpecker ci"]; !ok {
+			t.Errorf("'woodpecker ci' field output fn should be set")
+		}
+	})
+	t.Run("ValidateColumns", func(t *testing.T) {
+		err := to.ValidateColumns([]string{"non-existent", "NAME"})
+		if err == nil ||
+			strings.Contains(err.Error(), "name") ||
+			!strings.Contains(err.Error(), "non-existent") {
+			t.Errorf("error should contain 'non-existent' but not 'name': %v", err)
+		}
+	})
+	t.Run("WriteHeader", func(t *testing.T) {
+		to.WriteHeader([]string{"woodpecker_ci", "name"})
+		if wfs.String() != "WOODPECKER CI\tNAME\n" {
+			t.Errorf("written header should be 'WOODPECKER CI\\tNAME\\n', is: %q", wfs.String())
+		}
+		wfs.Reset()
+	})
+	t.Run("WriteLine", func(t *testing.T) {
+		_ = to.Write([]string{"woodpecker_ci", "name", "number"}, &testFieldsStruct{"test123", 1000000000})
+		if wfs.String() != "WOODPECKER CI!!!\ttest123\t1000000000\n" {
+			t.Errorf("written line should be 'WOODPECKER CI!!!\\ttest123\\t1000000000\\n', is: %q", wfs.String())
+		}
+		wfs.Reset()
+	})
+	t.Run("Columns", func(t *testing.T) {
+		if len(to.Columns()) != 3 {
+			t.Errorf("unexpected number of columns: %v", to.Columns())
+		}
+	})
+}