test: Make tests tolerant of warnings in the returned diagnostics

Prior to this change the strings.Contains assertion was only receiving a string representing the warning, and the error diagnostic was no longer being asserted against.

internal/configs/module_test.go

@@ -551,7 +551,12 @@ func TestModule_conflicting_backend_cloud_stateStore(t *testing.T) {
 				t.Fatal("module should have error diags, but does not")
 			}
 
-			if got := diags.Error(); !strings.Contains(got, tc.wantMsg) {
+			if tc.allowExperiments {
+				if len(diags) != 2 && len(diags.Errs()) != 1 {
+					t.Fatalf("expected 2 diagnostics (1 error, 1 warning), but got: %#v", diags)
+				}
+			}
+			if got := diags.Errs()[0]; !strings.Contains(got.Error(), tc.wantMsg) {
 				t.Fatalf("expected error to contain %q\nerror was:\n%s", tc.wantMsg, got)
 			}
 		})
@@ -674,9 +679,13 @@ func TestModule_state_store_multiple(t *testing.T) {
 		if !diags.HasErrors() {
 			t.Fatal("module should have error diags, but does not")
 		}
+		if len(diags.Errs()) != 1 {
+			t.Fatalf("expected 1 error, but received %d", len(diags.Errs()))
+		}
 
 		want := `Duplicate 'state_store' configuration block`
-		if got := diags.Error(); !strings.Contains(got, want) {
+		err := diags.Errs()[0]
+		if got := err.Error(); !strings.Contains(got, want) {
 			t.Fatalf("expected error to contain %q\nerror was:\n%s", want, got)
 		}
 	})

internal/configs/parser_config_dir_test.go

@@ -36,11 +36,16 @@ func TestParserLoadConfigDirSuccess(t *testing.T) {
 		t.Run(name, func(t *testing.T) {
 			parser := NewParser(nil)
 
+			var expectWarning bool
 			if strings.Contains(name, "state-store") {
 				// The PSS project is currently gated as experimental
 				// TODO(SarahFrench/radeksimko) - remove this from the test once
 				// the feature is GA.
 				parser.allowExperiments = true
+
+				// While the feature is experimental a warning will always be returned
+				// about the feature.
+				expectWarning = true
 			}
 
 			path := filepath.Join("testdata/valid-modules", name)
@@ -73,8 +78,20 @@ func TestParserLoadConfigDirSuccess(t *testing.T) {
 				}
 				diags = filterDiags
 			}
-			if len(diags) != 0 {
-				t.Errorf("unexpected diagnostics")
+			if diags.HasErrors() {
+				t.Errorf("unexpected error diagnostics")
+				for _, diag := range diags.Errs() {
+					t.Logf("- %s", diag)
+				}
+			}
+			if !expectWarning && len(diags) != 0 {
+				t.Errorf("unexpected diagnostics: expected no warnings")
+				for _, diag := range diags {
+					t.Logf("- %s", diag)
+				}
+			}
+			if expectWarning && len(diags) != 1 {
+				t.Errorf("unexpected diagnostics: expected a single warning")
 				for _, diag := range diags {
 					t.Logf("- %s", diag)
 				}