fix(signals): detect JVM/C#/Swift class-suffix test conventions

src/signals/test-evidence.ts

@@ -7,6 +7,11 @@ export function isTestPath(file: string): boolean {
     /(^|\/)[^/]+_spec\.rb$/i.test(file) ||
     /\.(test|spec)\.(ts|tsx|mts|cts|js|jsx|mjs|cjs|py|rb|rs)$/i.test(file) ||
     /(^|\/)[^/]+\.(cy|e2e)\.(ts|tsx|mts|cts|js|jsx|mjs|cjs)$/i.test(file) ||
+    // JVM / C# / Swift `SomethingTest(s)`/`SomethingSpec` class-suffix convention
+    // (JUnit, Kotlin/ScalaTest, Spock, xUnit/NUnit, XCTest). Case-sensitive on the
+    // PascalCase suffix so it can't false-positive on words that merely end in
+    // "test"/"spec" (Latest.java, Contest.cs, manifest.scala).
+    /(^|\/)\w*(Tests?|Spec)\.(java|kt|kts|scala|cs|swift|groovy)$/.test(file) ||
     /(^|\/)__snapshots__\//i.test(file)
   );
 }

test/unit/test-evidence.test.ts

@@ -34,6 +34,22 @@ describe("test evidence helpers", () => {
     expect(isTestPath("src/app/testing.py")).toBe(false); // no `test_` boundary ⇒ not a test
   });
 
+  it("detects JVM / C# / Swift class-suffix test conventions", () => {
+    // Paths NOT under a test/ directory, so only the class-suffix rule can match.
+    expect(isTestPath("app/src/main/java/WidgetTest.java")).toBe(true); // JUnit
+    expect(isTestPath("app/UserServiceTests.kt")).toBe(true); // Kotlin
+    expect(isTestPath("modules/pricing/PricingSpec.scala")).toBe(true); // ScalaTest
+    expect(isTestPath("Services/OrderTests.cs")).toBe(true); // xUnit/NUnit
+    expect(isTestPath("Sources/App/LoginTests.swift")).toBe(true); // XCTest
+    expect(isTestPath("gradle/CartSpec.groovy")).toBe(true); // Spock
+    // Case-sensitive suffix: words merely ending in test/spec are not tests.
+    expect(isTestPath("app/src/main/java/Latest.java")).toBe(false);
+    expect(isTestPath("Services/Contest.cs")).toBe(false);
+    expect(isTestPath("modules/manifest.scala")).toBe(false);
+    // A non-JVM extension with the same class name is unaffected by this rule.
+    expect(isTestPath("lib/WidgetTest.rb")).toBe(false);
+  });
+
   it("does not treat framework or integration directory names alone as test evidence", () => {
     expect(isTestPath("src/integration/auth.ts")).toBe(false);
     expect(isTestPath("src/playwright/client.ts")).toBe(false);