diff --git a/extensions/vscode/src/test/runTest.ts b/extensions/vscode/src/test/runTest.ts
index 0ceb97fc..00ade41d 100644
--- a/extensions/vscode/src/test/runTest.ts
+++ b/extensions/vscode/src/test/runTest.ts
@@ -28,6 +28,10 @@ type DebugMessage = {
 };
 
 const BREAKPOINT_SYNC_TEST_LOG_ENV = "SOROBAN_DEBUG_BREAKPOINT_SYNC_TEST_LOG";
+const FIXTURE_BREAKPOINT_MARKERS = {
+  nonExportedHelper: "BREAKPOINT_MARKER: non-exported-helper",
+  exportedEcho: "BREAKPOINT_MARKER: exported-echo",
+} as const;
 
 async function startMockDebuggerServer(options: {
   evaluateDelayMs: number;
@@ -195,6 +199,17 @@ async function assertProcessLogAbsent(
   );
 }
 
+function findFixtureLine(sourcePath: string, marker: string): number {
+  const lines = fs.readFileSync(sourcePath, "utf8").split(/\r?\n/);
+  const lineNumber = lines.findIndex((line) => line.includes(marker)) + 1;
+  assert.notEqual(
+    lineNumber,
+    0,
+    `Expected fixture marker '${marker}' in ${sourcePath}`,
+  );
+  return lineNumber;
+}
+
 async function main(): Promise<void> {
   if (!(await isLoopbackAvailable())) {
     console.warn(
@@ -785,10 +800,18 @@ async function main(): Promise<void> {
     "lib.rs",
   );
   assert.ok(fs.existsSync(sourcePath), `Missing fixture source: ${sourcePath}`);
+  const exportedEchoLine = findFixtureLine(
+    sourcePath,
+    FIXTURE_BREAKPOINT_MARKERS.exportedEcho,
+  );
+  const nonExportedHelperLine = findFixtureLine(
+    sourcePath,
+    FIXTURE_BREAKPOINT_MARKERS.nonExportedHelper,
+  );
   const exportedFunctions = await debuggerProcess.getContractFunctions();
   const resolvedBreakpoints = resolveSourceBreakpoints(
     sourcePath,
-    [14],
+    [exportedEchoLine],
     exportedFunctions,
   );
   assert.equal(
@@ -805,7 +828,7 @@ async function main(): Promise<void> {
 
   const nonExportedBreakpoints = resolveSourceBreakpoints(
     sourcePath,
-    [10],
+    [nonExportedHelperLine],
     exportedFunctions,
   );
   assert.equal(
@@ -832,7 +855,7 @@ async function main(): Promise<void> {
   // Test HEURISTIC_NO_FUNCTION behavior for lines outside any function
   const noFunctionBreakpoints = resolveSourceBreakpoints(
     sourcePath,
-    [1, 2, 12, 16], // Lines outside any function in lib.rs
+    [1, 2, 13, 18], // Lines outside any function in lib.rs
     exportedFunctions,
   );
 
@@ -1038,7 +1061,14 @@ async function runDapHappyPathE2E(
 
     const setBps = await client.request("setBreakpoints", {
       source: { path: fixtures.sourcePath },
-      breakpoints: [{ line: 14 }],
+      breakpoints: [
+        {
+          line: findFixtureLine(
+            fixtures.sourcePath,
+            FIXTURE_BREAKPOINT_MARKERS.exportedEcho,
+          ),
+        },
+      ],
     });
     assert.equal(
       setBps.success,
@@ -1062,7 +1092,14 @@ async function runDapHappyPathE2E(
 
     const privateBps = await client.request("setBreakpoints", {
       source: { path: fixtures.sourcePath },
-      breakpoints: [{ line: 10 }],
+      breakpoints: [
+        {
+          line: findFixtureLine(
+            fixtures.sourcePath,
+            FIXTURE_BREAKPOINT_MARKERS.nonExportedHelper,
+          ),
+        },
+      ],
     });
     assert.equal(
       privateBps.success,
diff --git a/extensions/vscode/src/test/suites.ts b/extensions/vscode/src/test/suites.ts
index 2d71a3bf..f7e1da1a 100644
--- a/extensions/vscode/src/test/suites.ts
+++ b/extensions/vscode/src/test/suites.ts
@@ -29,6 +29,10 @@ type TestFixtures = {
 };
 
 const BREAKPOINT_SYNC_TEST_LOG_ENV = "SOROBAN_DEBUG_BREAKPOINT_SYNC_TEST_LOG";
+const FIXTURE_BREAKPOINT_MARKERS = {
+  nonExportedHelper: "BREAKPOINT_MARKER: non-exported-helper",
+  exportedEcho: "BREAKPOINT_MARKER: exported-echo",
+} as const;
 
 async function startMockDebuggerServer(options: {
   evaluateDelayMs: number;
@@ -233,6 +237,17 @@ function resolveFixtures(): TestFixtures {
   };
 }
 
+function findFixtureLine(sourcePath: string, marker: string): number {
+  const lines = fs.readFileSync(sourcePath, "utf8").split(/\r?\n/);
+  const lineNumber = lines.findIndex((line) => line.includes(marker)) + 1;
+  assert.notEqual(
+    lineNumber,
+    0,
+    `Expected fixture marker '${marker}' in ${sourcePath}`,
+  );
+  return lineNumber;
+}
+
 export async function runSmokeSuite(): Promise<void> {
   {
     const mock = "backend: 1.2.3 protocol: 4.5.6";
@@ -575,10 +590,18 @@ export async function runSmokeSuite(): Promise<void> {
   await debuggerProcess.start();
   await debuggerProcess.ping();
 
+  const exportedEchoLine = findFixtureLine(
+    fixtures.sourcePath,
+    FIXTURE_BREAKPOINT_MARKERS.exportedEcho,
+  );
+  const nonExportedHelperLine = findFixtureLine(
+    fixtures.sourcePath,
+    FIXTURE_BREAKPOINT_MARKERS.nonExportedHelper,
+  );
   const exportedFunctions = await debuggerProcess.getContractFunctions();
   const resolvedBreakpoints = resolveSourceBreakpoints(
     fixtures.sourcePath,
-    [14],
+    [exportedEchoLine],
     exportedFunctions,
   );
   assert.equal(
@@ -595,7 +618,7 @@ export async function runSmokeSuite(): Promise<void> {
 
   const nonExportedBreakpoints = resolveSourceBreakpoints(
     fixtures.sourcePath,
-    [10],
+    [nonExportedHelperLine],
     exportedFunctions,
   );
   assert.equal(
@@ -622,7 +645,7 @@ export async function runSmokeSuite(): Promise<void> {
   // Test HEURISTIC_NO_FUNCTION behavior for lines outside any function
   const noFunctionBreakpoints = resolveSourceBreakpoints(
     fixtures.sourcePath,
-    [1, 2, 12, 16], // Lines outside any function in lib.rs
+    [1, 2, 13, 18], // Lines outside any function in lib.rs
     exportedFunctions,
   );
 
@@ -844,7 +867,14 @@ async function runDapHappyPathE2E(
 
     const setBps = await client.request("setBreakpoints", {
       source: { path: fixtures.sourcePath },
-      breakpoints: [{ line: 14 }],
+      breakpoints: [
+        {
+          line: findFixtureLine(
+            fixtures.sourcePath,
+            FIXTURE_BREAKPOINT_MARKERS.exportedEcho,
+          ),
+        },
+      ],
     });
     assert.equal(
       setBps.success,
@@ -878,7 +908,14 @@ async function runDapHappyPathE2E(
 
     const privateBps = await client.request("setBreakpoints", {
       source: { path: fixtures.sourcePath },
-      breakpoints: [{ line: 10 }],
+      breakpoints: [
+        {
+          line: findFixtureLine(
+            fixtures.sourcePath,
+            FIXTURE_BREAKPOINT_MARKERS.nonExportedHelper,
+          ),
+        },
+      ],
     });
     assert.equal(
       privateBps.success,
diff --git a/tests/fixtures/contracts/echo/src/lib.rs b/tests/fixtures/contracts/echo/src/lib.rs
index fdd1035b..269fcaa0 100644
--- a/tests/fixtures/contracts/echo/src/lib.rs
+++ b/tests/fixtures/contracts/echo/src/lib.rs
@@ -7,10 +7,12 @@ pub struct Echo;
 #[contractimpl]
 impl Echo {
     fn helper(v: Val) -> Val {
+        // BREAKPOINT_MARKER: non-exported-helper
         v
     }
 
     pub fn echo(_env: Env, v: Val) -> Val {
+        // BREAKPOINT_MARKER: exported-echo
         Self::helper(v)
     }
 }