test: add test case for test early decoder

earlydecoder/tests/decoder_test.go

@@ -0,0 +1,75 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package earlydecoder
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/hashicorp/go-version"
+	"github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2/hclsyntax"
+	tftest "github.com/hashicorp/terraform-schema/test"
+	"github.com/zclconf/go-cty-debug/ctydebug"
+)
+
+type testCase struct {
+	name          string
+	cfg           string
+	expectedMeta  *tftest.Meta
+	expectedError hcl.Diagnostics
+}
+
+var customComparer = []cmp.Option{
+	cmp.Comparer(compareVersionConstraint),
+	ctydebug.CmpOptions,
+}
+
+func TestLoadTest(t *testing.T) {
+	path := t.TempDir()
+
+	testCases := []testCase{
+		{
+			"empty config",
+			``,
+			&tftest.Meta{
+				Path:      path,
+				Filenames: []string{"test.tftest.hcl"},
+			},
+			nil,
+		},
+		// TODO: add more test once we do more early decoding
+	}
+
+	runTestCases(testCases, t, path)
+}
+
+func runTestCases(testCases []testCase, t *testing.T, path string) {
+	for i, tc := range testCases {
+		t.Run(fmt.Sprintf("%d-%s", i, tc.name), func(t *testing.T) {
+			f, diags := hclsyntax.ParseConfig([]byte(tc.cfg), "test.tftest.hcl", hcl.InitialPos)
+			if len(diags) > 0 {
+				t.Fatal(diags)
+			}
+			files := map[string]*hcl.File{
+				"test.tftest.hcl": f,
+			}
+
+			meta, diags := LoadTest(path, files)
+
+			if diff := cmp.Diff(tc.expectedError, diags, customComparer...); diff != "" {
+				t.Fatalf("expected errors doesn't match: %s", diff)
+			}
+
+			if diff := cmp.Diff(tc.expectedMeta, meta, customComparer...); diff != "" {
+				t.Fatalf("test meta doesn't match: %s", diff)
+			}
+		})
+	}
+}
+
+func compareVersionConstraint(x, y *version.Constraint) bool {
+	return x.Equals(y)
+}