From de832d157ea99a4dacf379d789e6f43582179920 Mon Sep 17 00:00:00 2001
From: Qing Yang <yangq.nj@gmail.com>
Date: Thu, 19 Oct 2023 11:37:30 -0700
Subject: [PATCH] coverage on crash

---
 README.md                               | 1 +
 testing/code_coverage/Test.swift        | 4 ++++
 testing/code_coverage/build_and_test.sh | 6 +++++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 2cd8b7d..5ace1bd 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ This repo is mostly my study notes about low level iOS.
 * Testing
     * [Behind the scenes: iOS Testing](./articles/iOSTesting.md)
     * [Behind the scenes: Code Coverage](./articles/CodeCoverage.md)
+    * [Code Coverage on Test Crash](./articles/CodeCoverageOnTestCrash.md)
     * [Archived] [XCTest](./xctest)
 * Xcode
     * [Behind the scenes: SwiftUI Previews](./articles/SwiftUIPreview.md)
diff --git a/testing/code_coverage/Test.swift b/testing/code_coverage/Test.swift
index dc95841..211b93e 100644
--- a/testing/code_coverage/Test.swift
+++ b/testing/code_coverage/Test.swift
@@ -7,4 +7,8 @@ class Tests: XCTestCase {
     XCTAssert(foo.func1(a: 0) == 0)
     XCTAssert(foo.func1(a: 2) == 1)
   }
+
+  // func testForceCrash() {
+  //   assertionFailure("Crash")
+  // }
 }
diff --git a/testing/code_coverage/build_and_test.sh b/testing/code_coverage/build_and_test.sh
index 7322a0d..0e6439b 100755
--- a/testing/code_coverage/build_and_test.sh
+++ b/testing/code_coverage/build_and_test.sh
@@ -37,13 +37,17 @@ xcrun clang -bundle -o $TEST_BINARY build/Test.o \
 PROFRAW_FILE="/tmp/test.profraw"
 PROFDATA_FILE="/tmp/test.profdata"
 
-export SIMCTL_CHILD_LLVM_PROFILE_FILE="$PROFRAW_FILE"
+# %c enables a mode in which profile counter updates are continuously synced to a file
+export SIMCTL_CHILD_LLVM_PROFILE_FILE="$PROFRAW_FILE%c"
 
 rm -f $PROFRAW_FILE $PROFDATA_FILE
 
+# Don't exit if test fails
+set +e
 xcrun simctl spawn --arch=$ARCH --standalone "iPhone 14 Pro"  \
     "$PLATFORM_DIR/Developer/Library/Xcode/Agents/xctest" \
     $PWD/build/Test.xctest
+set -e
 
 xcrun llvm-profdata merge -sparse "$PROFRAW_FILE" -o "$PROFDATA_FILE"