chore: move the experiments package out of the internal/ dir

Closes #2014

experiments/experiment_test.go

@@ -0,0 +1,140 @@
+package experiments_test
+
+import (
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/go-task/task/v3/experiments"
+	"github.com/go-task/task/v3/taskrc/ast"
+)
+
+func TestNew(t *testing.T) {
+	const (
+		exampleExperiment    = "EXAMPLE"
+		exampleExperimentEnv = "TASK_X_EXAMPLE"
+	)
+	tests := []struct {
+		name          string
+		config        *ast.TaskRC
+		allowedValues []int
+		env           int
+		wantEnabled   bool
+		wantActive    bool
+		wantValid     error
+		wantValue     int
+	}{
+		{
+			name:        `[] allowed, env=""`,
+			wantEnabled: false,
+			wantActive:  false,
+		},
+		{
+			name:        `[] allowed, env="1"`,
+			env:         1,
+			wantEnabled: false,
+			wantActive:  false,
+			wantValid: &experiments.InactiveError{
+				Name: exampleExperiment,
+			},
+			wantValue: 1,
+		},
+		{
+			name:          `[1] allowed, env=""`,
+			allowedValues: []int{1},
+			wantEnabled:   false,
+			wantActive:    true,
+		},
+		{
+			name:          `[1] allowed, env="1"`,
+			allowedValues: []int{1},
+			env:           1,
+			wantEnabled:   true,
+			wantActive:    true,
+			wantValue:     1,
+		},
+		{
+			name:          `[1] allowed, env="2"`,
+			allowedValues: []int{1},
+			env:           2,
+			wantEnabled:   false,
+			wantActive:    true,
+			wantValid: &experiments.InvalidValueError{
+				Name:          exampleExperiment,
+				AllowedValues: []int{1},
+				Value:         2,
+			},
+			wantValue: 2,
+		},
+		{
+			name:          `[1, 2] allowed, env="1"`,
+			allowedValues: []int{1, 2},
+			env:           1,
+			wantEnabled:   true,
+			wantActive:    true,
+			wantValue:     1,
+		},
+		{
+			name:          `[1, 2] allowed, env="1"`,
+			allowedValues: []int{1, 2},
+			env:           2,
+			wantEnabled:   true,
+			wantActive:    true,
+			wantValue:     2,
+		},
+		{
+			name: `[1] allowed, config="1"`,
+			config: &ast.TaskRC{
+				Experiments: map[string]int{
+					exampleExperiment: 1,
+				},
+			},
+			allowedValues: []int{1},
+			wantEnabled:   true,
+			wantActive:    true,
+			wantValue:     1,
+		},
+		{
+			name: `[1] allowed, config="2"`,
+			config: &ast.TaskRC{
+				Experiments: map[string]int{
+					exampleExperiment: 2,
+				},
+			},
+			allowedValues: []int{1},
+			wantEnabled:   false,
+			wantActive:    true,
+			wantValid: &experiments.InvalidValueError{
+				Name:          exampleExperiment,
+				AllowedValues: []int{1},
+				Value:         2,
+			},
+			wantValue: 2,
+		},
+		{
+			name: `[1, 2] allowed, env="1", config="2"`,
+			config: &ast.TaskRC{
+				Experiments: map[string]int{
+					exampleExperiment: 2,
+				},
+			},
+			allowedValues: []int{1, 2},
+			env:           1,
+			wantEnabled:   true,
+			wantActive:    true,
+			wantValue:     2,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv(exampleExperimentEnv, strconv.Itoa(tt.env))
+			x := experiments.New(exampleExperiment, tt.config, tt.allowedValues...)
+			assert.Equal(t, exampleExperiment, x.Name)
+			assert.Equal(t, tt.wantEnabled, x.Enabled())
+			assert.Equal(t, tt.wantActive, x.Active())
+			assert.Equal(t, tt.wantValid, x.Valid())
+			assert.Equal(t, tt.wantValue, x.Value)
+		})
+	}
+}