add try catch and attempt to grab specifically the json

CHANGELOG.md

@@ -1,11 +1,12 @@
 # What's New?
 
-## 1.19.0
+## 1.19
 
 Bug Fixes:
 
 - Fix issue where `cmake.preferredGenerators` wasn't falling back to the next entry when the first entry didn't exist [#2709](https://github.com/microsoft/vscode-cmake-tools/issues/2709)
 - Potential fix for attempting to load a non-variants file as a variants file and throwing a parse exception [#3727](https://github.com/microsoft/vscode-cmake-tools/issues/3727)
+- Fix edge case where parsing tests fails when additional output is printed before tests json. [#3750](https://github.com/microsoft/vscode-cmake-tools/issues/3750)
 - Fix issue where `Configure with CMake Debugger` fails on restart because the previously used pipe to CMake Debugger is no longer available. [#3582](https://github.com/microsoft/vscode-cmake-tools/issues/3582)
 
 ## 1.18.43

src/ctest.ts

@@ -705,7 +705,13 @@ export class CTestDriver implements vscode.Disposable {
                 log.error(localize('ctest.error', 'There was an error running ctest to determine available test executables'));
                 return result.retc || -3;
             }
-            this.tests = JSON.parse(result.stdout) ?? undefined;
+
+            try {
+                this.tests = JSON.parse(result.stdout.slice(result.stdout.indexOf("{"))) ?? undefined;
+            } catch {
+                this.tests = undefined;
+            }
+
             if (this.tests && this.tests.kind === 'ctestInfo') {
                 this.tests.tests.forEach(test => {
                     let testDefFile: string | undefined;