Allow terraform init when only test files are present in directory

.changes/unreleased/ENHANCEMENTS-20250205-104144.yaml

@@ -0,0 +1,5 @@
+kind: ENHANCEMENTS
+body: Allow terraform init when only test files are present in directory
+time: 2025-02-05T10:41:44.663251+01:00
+custom:
+    Issue: "35040"

internal/command/init.go

@@ -108,7 +108,7 @@ func (c *InitCommand) Run(args []string) int {
 	if initArgs.FromModule != "" {
 		src := initArgs.FromModule
 
-		empty, err := configs.IsEmptyDir(path)
+		empty, err := configs.IsEmptyDir(path, initArgs.TestsDirectory)
 		if err != nil {
 			diags = diags.Append(fmt.Errorf("Error validating destination directory: %s", err))
 			view.Diagnostics(diags)
@@ -148,7 +148,7 @@ func (c *InitCommand) Run(args []string) int {
 
 	// If our directory is empty, then we're done. We can't get or set up
 	// the backend with an empty directory.
-	empty, err := configs.IsEmptyDir(path)
+	empty, err := configs.IsEmptyDir(path, initArgs.TestsDirectory)
 	if err != nil {
 		diags = diags.Append(fmt.Errorf("Error checking configuration: %s", err))
 		view.Diagnostics(diags)

internal/command/init_test.go

@@ -9,6 +9,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 	"testing"
 
@@ -20,6 +21,7 @@ import (
 
 	"github.com/hashicorp/terraform/internal/addrs"
 	"github.com/hashicorp/terraform/internal/command/arguments"
+	"github.com/hashicorp/terraform/internal/command/views"
 	"github.com/hashicorp/terraform/internal/configs"
 	"github.com/hashicorp/terraform/internal/configs/configschema"
 	"github.com/hashicorp/terraform/internal/depsfile"
@@ -32,6 +34,25 @@ import (
 	"github.com/hashicorp/terraform/internal/states/statemgr"
 )
 
+// cleanString removes newlines, and redundant spaces.
+func cleanString(s string) string {
+	// Replace newlines with a single space.
+	s = strings.ReplaceAll(s, "\n", " ")
+
+	// Remove other special characters like \r, \t
+	s = strings.ReplaceAll(s, "\r", "")
+	s = strings.ReplaceAll(s, "\t", "")
+
+	// Replace multiple spaces with a single space.
+	spaceRegex := regexp.MustCompile(`\s+`)
+	s = spaceRegex.ReplaceAllString(s, " ")
+
+	// Trim any leading or trailing spaces.
+	s = strings.TrimSpace(s)
+
+	return s
+}
+
 func TestInit_empty(t *testing.T) {
 	// Create a temporary working directory that is empty
 	td := t.TempDir()
@@ -52,6 +73,42 @@ func TestInit_empty(t *testing.T) {
 	if code := c.Run(args); code != 0 {
 		t.Fatalf("bad: \n%s", done(t).All())
 	}
+	exp := views.MessageRegistry[views.OutputInitEmptyMessage].JSONValue
+	actual := cleanString(done(t).All())
+	if !strings.Contains(actual, cleanString(exp)) {
+		t.Fatalf("expected output to be %q\n, got %q", exp, actual)
+	}
+}
+
+func TestInit_only_test_files(t *testing.T) {
+	// Create a temporary working directory that has only test files and no tf configuration
+	td := t.TempDir()
+	os.MkdirAll(td, 0755)
+	defer testChdir(t, td)()
+
+	if _, err := os.Create("main.tftest.hcl"); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	ui := new(cli.MockUi)
+	view, done := testView(t)
+	c := &InitCommand{
+		Meta: Meta{
+			testingOverrides: metaOverridesForProvider(testProvider()),
+			Ui:               ui,
+			View:             view,
+		},
+	}
+
+	args := []string{}
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: \n%s", done(t).All())
+	}
+	exp := views.MessageRegistry[views.OutputInitSuccessCLIMessage].JSONValue
+	actual := cleanString(done(t).All())
+	if !strings.Contains(actual, cleanString(exp)) {
+		t.Fatalf("expected output to be %q\n, got %q", exp, actual)
+	}
 }
 
 func TestInit_multipleArgs(t *testing.T) {

internal/command/providers.go

@@ -49,7 +49,7 @@ func (c *ProvidersCommand) Run(args []string) int {
 
 	var diags tfdiags.Diagnostics
 
-	empty, err := configs.IsEmptyDir(configPath)
+	empty, err := configs.IsEmptyDir(configPath, "")
 	if err != nil {
 		diags = diags.Append(tfdiags.Sourceless(
 			tfdiags.Error,

internal/command/test_test.go

@@ -41,6 +41,14 @@ func TestTest_Runs(t *testing.T) {
 			expectedOut: []string{"1 passed, 0 failed."},
 			code:        0,
 		},
+		"top-dir-only-test-files": {
+			expectedOut: []string{"1 passed, 0 failed."},
+			code:        0,
+		},
+		"top-dir-only-nested-test-files": {
+			expectedOut: []string{"1 passed, 0 failed."},
+			code:        0,
+		},
 		"simple_pass_nested": {
 			expectedOut: []string{"1 passed, 0 failed."},
 			code:        0,

internal/command/testdata/test/top-dir-only-nested-test-files/fixtures/main.tf

@@ -0,0 +1,8 @@
+variable "sample" {
+  type = bool
+  default = true
+}
+
+output "name" {
+  value = var.sample
+}

internal/command/testdata/test/top-dir-only-nested-test-files/tests/main.tftest.hcl

@@ -0,0 +1,9 @@
+run "foo" {
+    module {
+        source = "./fixtures"
+    }
+    assert {
+      condition = output.name == true
+      error_message = "foo"
+    }
+}

internal/command/testdata/test/top-dir-only-test-files/fixtures/main.tf

@@ -0,0 +1,8 @@
+variable "sample" {
+  type = bool
+  default = true
+}
+
+output "name" {
+  value = var.sample
+}

internal/command/testdata/test/top-dir-only-test-files/main.tftest.hcl

@@ -0,0 +1,9 @@
+run "foo" {
+    module {
+        source = "./fixtures"
+    }
+    assert {
+      condition = output.name == true
+      error_message = "foo"
+    }
+}

internal/configs/parser_config_dir.go

@@ -324,21 +324,21 @@ func IsIgnoredFile(name string) bool {
 }
 
 // IsEmptyDir returns true if the given filesystem path contains no Terraform
-// configuration files.
+// configuration or test files.
 //
 // Unlike the methods of the Parser type, this function always consults the
 // real filesystem, and thus it isn't appropriate to use when working with
 // configuration loaded from a plan file.
-func IsEmptyDir(path string) (bool, error) {
+func IsEmptyDir(path, testDir string) (bool, error) {
 	if _, err := os.Stat(path); err != nil && os.IsNotExist(err) {
 		return true, nil
 	}
 
 	p := NewParser(nil)
-	fs, os, _, diags := p.dirFiles(path, "")
+	fs, os, tests, diags := p.dirFiles(path, testDir)
 	if diags.HasErrors() {
 		return false, diags
 	}
 
-	return len(fs) == 0 && len(os) == 0, nil
+	return len(fs) == 0 && len(os) == 0 && len(tests) == 0, nil
 }

internal/configs/parser_config_dir_test.go

@@ -321,7 +321,7 @@ func TestParserLoadConfigDirFailure(t *testing.T) {
 }
 
 func TestIsEmptyDir(t *testing.T) {
-	val, err := IsEmptyDir(filepath.Join("testdata", "valid-files"))
+	val, err := IsEmptyDir(filepath.Join("testdata", "valid-files"), "")
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
@@ -331,7 +331,7 @@ func TestIsEmptyDir(t *testing.T) {
 }
 
 func TestIsEmptyDir_noExist(t *testing.T) {
-	val, err := IsEmptyDir(filepath.Join("testdata", "nopenopenope"))
+	val, err := IsEmptyDir(filepath.Join("testdata", "nopenopenope"), "")
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
@@ -340,12 +340,35 @@ func TestIsEmptyDir_noExist(t *testing.T) {
 	}
 }
 
-func TestIsEmptyDir_noConfigs(t *testing.T) {
-	val, err := IsEmptyDir(filepath.Join("testdata", "dir-empty"))
+func TestIsEmptyDir_noConfigsAndTests(t *testing.T) {
+	val, err := IsEmptyDir(filepath.Join("testdata", "dir-empty"), "")
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
 	if !val {
 		t.Fatal("should be empty")
 	}
 }
+
+func TestIsEmptyDir_noConfigsButHasTests(t *testing.T) {
+	// The top directory has no configs, but it contains test files
+	val, err := IsEmptyDir(filepath.Join("testdata", "only-test-files"), "tests")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if val {
+		t.Fatal("should not be empty")
+	}
+}
+
+func TestIsEmptyDir_nestedTestsOnly(t *testing.T) {
+	// The top directory has no configs and no test files, but the nested
+	// directory has test files
+	val, err := IsEmptyDir(filepath.Join("testdata", "only-nested-test-files"), "tests")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if val {
+		t.Fatal("should not be empty")
+	}
+}

internal/configs/testdata/only-nested-test-files/fixtures/main.tf

@@ -0,0 +1,8 @@
+variable "sample" {
+  type = bool
+  default = true
+}
+
+output "name" {
+  value = var.sample
+}

internal/configs/testdata/only-nested-test-files/tests/main.tftest.hcl

@@ -0,0 +1,9 @@
+run "foo" {
+    module {
+        source = "./fixtures"
+    }
+    assert {
+      condition = output.name == true
+      error_message = "foo"
+    }
+}

internal/configs/testdata/only-test-files/fixtures/main.tf

@@ -0,0 +1,8 @@
+variable "sample" {
+  type = bool
+  default = true
+}
+
+output "name" {
+  value = var.sample
+}

internal/configs/testdata/only-test-files/main.tftest.hcl

@@ -0,0 +1,9 @@
+run "foo" {
+    module {
+        source = "./fixtures"
+    }
+    assert {
+      condition = output.name == true
+      error_message = "foo"
+    }
+}