Fixes #4098: Added tests for ComparableOperationSubjectTest

scripts/assets/test_file_exemptions.textproto

@@ -4098,10 +4098,6 @@ test_file_exemption {
   exempted_file_path: "testing/src/main/java/org/oppia/android/testing/logging/SyncStatusTestModule.kt"
   override_min_coverage_percent_required: 0
 }
-test_file_exemption {
-  exempted_file_path: "testing/src/main/java/org/oppia/android/testing/math/ComparableOperationSubject.kt"
-  test_file_not_required: true
-}
 test_file_exemption {
   exempted_file_path: "testing/src/main/java/org/oppia/android/testing/math/MathParsingErrorSubject.kt"
   test_file_not_required: true

testing/src/main/java/org/oppia/android/testing/math/ComparableOperationSubject.kt

@@ -12,8 +12,6 @@ import org.oppia.android.app.model.ComparableOperation.ComparisonTypeCase
 import org.oppia.android.app.model.Real
 import org.oppia.android.testing.math.RealSubject.Companion.assertThat
 
-// TODO(#4098): Add tests for this class.
-
 /**
  * Truth subject for verifying properties of [ComparableOperation]s.
  *

testing/src/test/java/org/oppia/android/testing/math/BUILD.bazel

@@ -96,3 +96,19 @@ oppia_android_test(
         "//third_party:robolectric_android-all",
     ],
 )
+
+oppia_android_test(
+    name = "ComparableOperationSubjectTest",
+    srcs = ["ComparableOperationSubjectTest.kt"],
+    custom_package = "org.oppia.android.testing.math",
+    test_class = "org.oppia.android.testing.math.ComparableOperationSubjectTest",
+    test_manifest = "//testing:test_manifest",
+    deps = [
+        "//model/src/main/proto:math_java_proto_lite",
+        "//testing/src/main/java/org/oppia/android/testing/math:comparable_operation_subject",
+        "//testing/src/main/java/org/oppia/android/testing/robolectric:test_module",
+        "//third_party:com_google_truth_truth",
+        "//third_party:junit_junit",
+        "//third_party:robolectric_android-all",
+    ],
+)