[ci] Split SW build and test

Signed-off-by: James Wainwright <[email protected]>

azure-pipelines.yml

@@ -208,8 +208,8 @@ jobs:
       # Check the entire build graph for conflicts in loading or analysis
       # phases. For context, see issue #18726.
       ci/bazelisk.sh build --nobuild //...
-      # This command builds all software and runs all unit tests that run on the
-      # host, with a few exceptions:
+
+      # This command selects the unit tests to be executed:
       # * It excludes //quality because that's the purview of `slow_lints`.
       # * It excludes //sw/otbn/crypto because that's tested in `otbn_crypto_tests`.
       # * It excludes the tests from //third_party/riscv-compliance because
@@ -234,18 +234,29 @@ jobs:
         --define DISABLE_VERILATOR_BUILD=true \
         -- "rdeps(//..., kind(bitstream_splice, //...))" \
         >> "${TARGET_PATTERN_FILE}"
+
+      # Build unit tests and their dependencies.
       ci/bazelisk.sh build \
         --build_tests_only=false \
         --define DISABLE_VERILATOR_BUILD=true \
         --test_tag_filters=-broken,-cw310,-verilator,-dv \
         --target_pattern_file="${TARGET_PATTERN_FILE}"
+
+      # Export the "TARGET_PATTERN_FILE" variable to be used in tests.
+      echo "##vso[task.setvariable variable=targetPatternFile]${TARGET_PATTERN_FILE}"
+    displayName: Build SW
+  - bash: |
+      set -x -e
+      export GCP_BAZEL_CACHE_KEY=$(bazelCacheGcpKeyPath)
+      export TARGET_PATTERN_FILE=$(targetPatternFile)
+
       ci/bazelisk.sh test \
         --build_tests_only=false \
         --test_output=errors \
         --define DISABLE_VERILATOR_BUILD=true \
         --test_tag_filters=-broken,-cw310,-verilator,-dv \
         --target_pattern_file="${TARGET_PATTERN_FILE}"
-    displayName: Build & test SW
+    displayName: Test SW
   - template: ci/publish-bazel-test-results.yml
   - bash: |
       set -x -e