testing: include file-level errors in JUnit skipped elements

Fixes #37801

Author: Kevin Vu

internal/command/junit/junit.go

@@ -209,7 +209,7 @@ func junitXMLTestReport(suite *moduletest.Suite, suiteRunnerStopped bool, source
 			// Depending on run status, add either of: "skipped", "failure", or "error" elements
 			switch run.Status {
 			case moduletest.Skip:
-				testCase.Skipped = skipDetails(i, file, suiteRunnerStopped)
+				testCase.Skipped = skipDetails(i, file, suiteRunnerStopped, sources)
 
 			case moduletest.Fail:
 				// When the test fails we only use error diags that originate from failing assertions
@@ -300,8 +300,9 @@ func failureMessage(failedAssertions tfdiags.Diagnostics, checkCount int) string
 // Test can be skipped due to:
 // 1. terraform test recieving an interrupt from users; all unstarted tests will be skipped
 // 2. A previous run in a file has failed, causing subsequent run blocks to be skipped
+// 3. File-level errors (e.g., invalid variable references) causing all tests to be skipped
 // The returned value is used to set content in the "skipped" element
-func skipDetails(runIndex int, file *moduletest.File, suiteStopped bool) *withMessage {
+func skipDetails(runIndex int, file *moduletest.File, suiteStopped bool, sources map[string][]byte) *withMessage {
 	if suiteStopped {
 		// Test suite experienced an interrupt
 		// This block only handles graceful Stop interrupts, as Cancel interrupts will prevent a JUnit file being produced at all
@@ -323,6 +324,14 @@ func skipDetails(runIndex int, file *moduletest.File, suiteStopped bool) *withMe
 				}
 			}
 		}
+
+		// Check for file-level error diagnostics that caused tests to be skipped
+		if file.Diagnostics.HasErrors() {
+			return &withMessage{
+				Message: "Testcase skipped due to file-level errors",
+				Body:    getDiagString(file.Diagnostics, sources),
+			}
+		}
 	}
 
 	// Unhandled case: This results in <skipped></skipped> with no attributes or body

internal/command/junit/junit_test.go

@@ -12,6 +12,7 @@ import (
 	"github.com/hashicorp/terraform/internal/command/junit"
 	"github.com/hashicorp/terraform/internal/configs/configload"
 	"github.com/hashicorp/terraform/internal/moduletest"
+	"github.com/hashicorp/terraform/internal/tfdiags"
 )
 
 // This test cannot access sources when contructing output for XML files. Due to this, the majority of testing
@@ -114,6 +115,47 @@ func Test_TestJUnitXMLFile_Save(t *testing.T) {
       <skipped></skipped>
     </testcase>
   </testsuite>
+</testsuites>`),
+		},
+		"<skipped> element includes file-level error diagnostics when tests are skipped due to file errors": {
+			filename: "output.xml",
+			runner:   &local.TestSuiteRunner{},
+			suite: func() moduletest.Suite {
+				file := &moduletest.File{
+					Name:   "file1.tftest.hcl",
+					Status: moduletest.Error,
+					Runs: []*moduletest.Run{
+						{
+							Name:   "my_test",
+							Status: moduletest.Skip,
+						},
+					},
+				}
+				// Simulate file-level error diagnostic (e.g., invalid variable reference)
+				var diags tfdiags.Diagnostics
+				diags = diags.Append(tfdiags.Sourceless(
+					tfdiags.Error,
+					"Invalid reference",
+					"You can only reference global variables within the test file variables block.",
+				))
+				file.AppendDiagnostics(diags)
+				return moduletest.Suite{
+					Status: moduletest.Error,
+					Files: map[string]*moduletest.File{
+						"file1.tftest.hcl": file,
+					},
+				}
+			}(),
+			expectedOuput: []byte(`<?xml version="1.0" encoding="UTF-8"?><testsuites>
+  <testsuite name="file1.tftest.hcl" tests="1" skipped="1" failures="0" errors="0">
+    <testcase name="my_test" classname="file1.tftest.hcl">
+      <skipped message="Testcase skipped due to file-level errors"><![CDATA[
+Error: Invalid reference
+
+You can only reference global variables within the test file variables block.
+]]></skipped>
+    </testcase>
+  </testsuite>
 </testsuites>`),
 		},
 	}