diff --git a/libc/test/src/__support/CMakeLists.txt b/libc/test/src/__support/CMakeLists.txt
index d056969034d69..6513e534607b9 100644
--- a/libc/test/src/__support/CMakeLists.txt
+++ b/libc/test/src/__support/CMakeLists.txt
@@ -249,31 +249,22 @@ add_libc_test(
     libc.src.__support.memory_size
 )
 
-# FIXME: We shouldn't have regular executables created because we could be
-#        cross-compiling the tests and running through an emulator.
 if(NOT LIBC_TARGET_OS_IS_GPU)
-  add_executable(
-    libc_str_to_float_comparison_test
-    str_to_float_comparison_test.cpp
-  )
-
-  target_link_libraries(libc_str_to_float_comparison_test
-    PRIVATE
-      "${LIBC_TARGET}"
-  )
-
-  add_executable(
-    libc_system_str_to_float_comparison_test
-    str_to_float_comparison_test.cpp
+  add_libc_test(
+    str_to_float_comparison_test
+    SUITE
+      libc-support-tests
+    SRCS
+      str_to_float_comparison_test.cpp
+    DEPENDS
+      libc.src.stdio.printf
+      libc.src.stdio.fopen
+      libc.src.stdio.fclose
+      libc.src.stdio.fgets
+      libc.src.stdlib.strtof
+      libc.src.stdlib.strtod
+    NO_RUN_POSTBUILD
   )
-
-  set(float_test_file ${CMAKE_CURRENT_SOURCE_DIR}/str_to_float_comparison_data.txt)
-
-  add_custom_command(TARGET libc_str_to_float_comparison_test
-                     POST_BUILD
-                     COMMAND ${CMAKE_CROSSCOMPILING_EMULATOR} $<TARGET_FILE:libc_str_to_float_comparison_test> ${float_test_file}
-                     COMMENT "Test the strtof and strtod implementations against precomputed results."
-                     VERBATIM)
 endif()
 
 add_subdirectory(CPP)
diff --git a/libc/test/src/__support/str_to_float_comparison_test.cpp b/libc/test/src/__support/str_to_float_comparison_test.cpp
index 61bfc3cd0903a..5f3100d3b5946 100644
--- a/libc/test/src/__support/str_to_float_comparison_test.cpp
+++ b/libc/test/src/__support/str_to_float_comparison_test.cpp
@@ -6,16 +6,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-// #include "src/__support/str_float_conv_utils.h"
-
-#include <stdlib.h> // For string to float functions
-
-// #include "src/__support/FPUtil/FPBits.h"
-
-#include <cstdint>
-#include <fstream>
-#include <iostream>
-#include <string>
+#include "src/stdio/fclose.h"
+#include "src/stdio/fgets.h"
+#include "src/stdio/fopen.h"
+#include "src/stdio/printf.h"
+#include "src/stdlib/strtod.h"
+#include "src/stdlib/strtof.h"
+#include "test/UnitTest/Test.h"
+#include <stdint.h>
 
 // The intent of this test is to read in files in the format used in this test
 // dataset: https://github.com/nigeltao/parse-number-fxx-test-data
@@ -59,16 +57,18 @@ int checkFile(char *inputFileName, int *totalFails, int *totalBitDiffs,
   int32_t curFails = 0;    // Only counts actual failures, not bitdiffs.
   int32_t curBitDiffs = 0; // A bitdiff is when the expected result and actual
                            // result are off by +/- 1 bit.
-  std::string line;
-  std::string num;
+  char *line = nullptr;
+  char *num = nullptr;
 
-  std::ifstream fileStream(inputFileName, std::ifstream::in);
+  auto *fileHandle = LIBC_NAMESPACE::fopen(inputFileName, "r");
 
-  if (!fileStream.is_open()) {
-    std::cout << "file '" << inputFileName << "' failed to open. Exiting.\n";
+  if (!fileHandle) {
+    LIBC_NAMESPACE::printf("file '%s' failed to open. Exiting.\n",
+                           inputFileName);
     return 1;
   }
-  while (getline(fileStream, line)) {
+
+  while (LIBC_NAMESPACE::fgets(line, 100, fileHandle)) {
     if (line[0] == '#') {
       continue;
     }
@@ -76,13 +76,13 @@ int checkFile(char *inputFileName, int *totalFails, int *totalBitDiffs,
     uint32_t expectedFloatRaw;
     uint64_t expectedDoubleRaw;
 
-    expectedFloatRaw = fastHexToU32(line.c_str() + 5);
-    expectedDoubleRaw = fastHexToU64(line.c_str() + 14);
-    num = line.substr(31);
+    expectedFloatRaw = fastHexToU32(line + 5);
+    expectedDoubleRaw = fastHexToU64(line + 14);
+    num = line + 31;
 
-    float floatResult = strtof(num.c_str(), nullptr);
+    float floatResult = LIBC_NAMESPACE::strtof(num, nullptr);
 
-    double doubleResult = strtod(num.c_str(), nullptr);
+    double doubleResult = LIBC_NAMESPACE::strtod(num, nullptr);
 
     uint32_t floatRaw = *(uint32_t *)(&floatResult);
 
@@ -101,9 +101,8 @@ int checkFile(char *inputFileName, int *totalFails, int *totalBitDiffs,
         curFails++;
       }
       if (curFails + curBitDiffs < 10) {
-        std::cout << "Float fail for '" << num << "'. Expected " << std::hex
-                  << expectedFloatRaw << " but got " << floatRaw << "\n"
-                  << std::dec;
+        LIBC_NAMESPACE::printf("Float fail for '%s'. Expected %x but got %x\n",
+                               num, expectedFloatRaw, floatRaw);
       }
     }
 
@@ -120,14 +119,14 @@ int checkFile(char *inputFileName, int *totalFails, int *totalBitDiffs,
         curFails++;
       }
       if (curFails + curBitDiffs < 10) {
-        std::cout << "Double fail for '" << num << "'. Expected " << std::hex
-                  << expectedDoubleRaw << " but got " << doubleRaw << "\n"
-                  << std::dec;
+        LIBC_NAMESPACE::printf(
+            "Double fail for '%s'. Expected %lx but got %lx\n", num,
+            expectedDoubleRaw, doubleRaw);
       }
     }
   }
 
-  fileStream.close();
+  LIBC_NAMESPACE::fclose(fileHandle);
 
   *totalBitDiffs += curBitDiffs;
   *totalFails += curFails;
@@ -138,7 +137,7 @@ int checkFile(char *inputFileName, int *totalFails, int *totalBitDiffs,
   return 0;
 }
 
-int main(int argc, char *argv[]) {
+TEST(LlvmLibcStrToFloatComparisonTest, CheckFile) {
   int result = 0;
   int fails = 0;
 
@@ -150,24 +149,23 @@ int main(int argc, char *argv[]) {
   int detailedBitDiffs[4] = {0, 0, 0, 0};
 
   int total = 0;
-  for (int i = 1; i < argc; i++) {
-    std::cout << "Starting file " << argv[i] << "\n";
-    int curResult =
-        checkFile(argv[i], &fails, &bitdiffs, detailedBitDiffs, &total);
-    if (curResult == 1) {
-      result = 1;
-      break;
-    } else if (curResult == 2) {
-      result = 2;
-    }
+
+  char filename[] = "str_to_float_comparison_data.txt";
+  LIBC_NAMESPACE::printf("Starting file %s\n", filename);
+  int curResult =
+      checkFile(filename, &fails, &bitdiffs, detailedBitDiffs, &total);
+  if (curResult == 1) {
+    result = 1;
+  } else if (curResult == 2) {
+    result = 2;
   }
-  std::cout << "Results:\n"
-            << "Total significant failed conversions: " << fails << "\n"
-            << "Total conversions off by +/- 1 bit: " << bitdiffs << "\n"
-            << "\t" << detailedBitDiffs[0] << "\tfloat low\n"
-            << "\t" << detailedBitDiffs[1] << "\tfloat high\n"
-            << "\t" << detailedBitDiffs[2] << "\tdouble low\n"
-            << "\t" << detailedBitDiffs[3] << "\tdouble high\n"
-            << "Total lines: " << total << "\n";
-  return result;
+
+  EXPECT_EQ(result, 0);
+  EXPECT_EQ(fails, 0);
+  EXPECT_EQ(bitdiffs, 0);
+  EXPECT_EQ(detailedBitDiffs[0], 0);
+  EXPECT_EQ(detailedBitDiffs[1], 0);
+  EXPECT_EQ(detailedBitDiffs[2], 0);
+  EXPECT_EQ(detailedBitDiffs[3], 0);
+  EXPECT_EQ(total, 0);
 }