diff --git a/web/src/engine/predictive-text/worker-thread/build.sh b/web/src/engine/predictive-text/worker-thread/build.sh
index 0b950479b63..5d3289ac073 100755
--- a/web/src/engine/predictive-text/worker-thread/build.sh
+++ b/web/src/engine/predictive-text/worker-thread/build.sh
@@ -24,6 +24,7 @@ SRCMAP_CLEANER="${KEYMAN_ROOT}/web/build/tools/building/sourcemap-root/index.js"
 ################################ Main script ################################
 
 SUBPROJECT_NAME=engine/predictive-text/worker-thread
+SUBPROJECT_HELPERS=engine/predictive-text/helpers
 
 builder_describe \
   "Compiles the Language Modeling Layer for common use in predictive text and autocorrective applications." \
@@ -103,6 +104,7 @@ function do_test() {
     WTR_INSPECT=" --manual"
   fi
 
+  test-headless-typescript $SUBPROJECT_HELPERS
   test-headless-typescript $SUBPROJECT_NAME
 
   web-test-runner --config ./src/tests/test-runner/web-test-runner${WTR_CONFIG}.config.mjs ${WTR_INSPECT}
diff --git a/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.tests.ts b/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.tests.ts
index b680159c044..91198443786 100644
--- a/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.tests.ts
+++ b/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.tests.ts
@@ -9,10 +9,9 @@
 
 import { assert } from "chai";
 
-import { SearchQuotientNode } from "@keymanapp/lm-worker/test-index";
+import { SearchQuotientNode, SearchQuotientSpur } from "@keymanapp/lm-worker/test-index";
 
 import { constituentPaths } from "./constituentPaths.js";
-import { quotientPathHasInputs } from "./quotientPathHasInputs.js";
 import { buildAlphabeticClusterFixtures } from "./buildAlphabeticClusteredFixture.js";
 
 describe('buildAlphabeticClusteredFixture() fixture', () => {
@@ -24,7 +23,10 @@ describe('buildAlphabeticClusteredFixture() fixture', () => {
     const allDists = Object.values(distributions).map(set => Object.values(set)).flat();
     const finalClusterPaths = constituentPaths(clusters.cluster_k5c6) as SearchQuotientNode[][];
 
-    allPaths.forEach((spur) => assert.isOk(finalClusterPaths.find(seq => seq.indexOf(spur) > -1)));
-    allDists.forEach((dist) => assert.isOk(allPaths.find(path => quotientPathHasInputs(path, [dist]))));
+    allPaths
+      // This one path doesn't get clustered;  it's the only way to reach excess length in this fixture.
+      .filter((spur) => spur != paths[4].path_k4c6)
+      .forEach((spur) => assert.isOk(finalClusterPaths.find(seq => seq.indexOf(spur) > -1), `spur ${spur.spaceId} is disconnected`));
+    allDists.forEach((dist) => assert.isOk(allPaths.find(path => (path as SearchQuotientSpur).inputs == dist), `distribution ${JSON.stringify(dist)} has no matching path`));
   });
 });
\ No newline at end of file
diff --git a/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.ts b/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.ts
index d45cffc7e4c..e330eb51d8e 100644
--- a/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.ts
+++ b/web/src/test/auto/headless/engine/predictive-text/helpers/buildAlphabeticClusteredFixture.ts
@@ -163,10 +163,8 @@ export const buildAlphabeticClusterFixtures = () => {
         distrib_c3_i2d0
       }
     },
+    root: rootPath,
     paths: {
-      0: {
-        rootPath
-      },
       1: {
         path_k1c1_i1d0,
         path_k1c2_i2d0,
diff --git a/web/src/test/auto/headless/engine/predictive-text/helpers/constituentPaths.tests.ts b/web/src/test/auto/headless/engine/predictive-text/helpers/constituentPaths.tests.ts
index 30cac6a53a9..d3df0742d50 100644
--- a/web/src/test/auto/headless/engine/predictive-text/helpers/constituentPaths.tests.ts
+++ b/web/src/test/auto/headless/engine/predictive-text/helpers/constituentPaths.tests.ts
@@ -89,7 +89,7 @@ describe('constituentPaths', () => {
           return type == 'insert' && typeSeq[index+1] == 'delete';
         });
       });
-      assert.isNotOk(shouldOccur);
+      assert.isOk(shouldOccur);
     });
   });
 });
\ No newline at end of file
diff --git a/web/src/test/auto/headless/engine/predictive-text/worker-thread/correction-search/search-quotient-cluster.tests.ts b/web/src/test/auto/headless/engine/predictive-text/worker-thread/correction-search/search-quotient-cluster.tests.ts
index 029aa6bed31..421b3df1fdc 100644
--- a/web/src/test/auto/headless/engine/predictive-text/worker-thread/correction-search/search-quotient-cluster.tests.ts
+++ b/web/src/test/auto/headless/engine/predictive-text/worker-thread/correction-search/search-quotient-cluster.tests.ts
@@ -808,7 +808,7 @@ describe('SearchQuotientCluster', () => {
 
       const mergeResult = baseCluster.merge(new LegacyQuotientSpur(
         // Is (and mocks) the head result from `path_k4c4_i1.split(3)`.
-        fixture.paths[0].rootPath,
+        fixture.root,
         // Mocks the tail result from `path_k4c4_i1.split(3)`.
         fixture.distributions[4].distrib_c2_i1d0, {
           segment: {