Add unit tests on windows

Author: tvallin

.github/actions/common/action.yml

@@ -54,7 +54,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - if: ${{ inputs.free-space == 'true' }}
+    - if: ${{ inputs.free-space == 'true' && runner.os != 'Windows'}}
       # See https://github.com/actions/runner-images/issues/2840
       name: Free disk space
       shell: bash

.github/workflows/validate.yml

@@ -102,12 +102,13 @@ jobs:
     timeout-minutes: 30
     strategy:
       matrix:
-        os: [ ubuntu-20.04 ]
+        os: [ ubuntu-20.04, windows-2022 ]
         moduleSet: [ core, it, dbclient, dbclient-oracle, others ]
         include:
           - { os: ubuntu-20.04, platform: linux }
+          - { os: windows-2022, platform: windows }
     runs-on: ${{ matrix.os }}
-    name: tests/${{ matrix.moduleSet }}
+    name: tests/${{ matrix.moduleSet }}-${{matrix.platform}}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -319,6 +320,7 @@ jobs:
         include:
           - { os: ubuntu-20.04, platform: linux }
           - { os: macos-14, platform: macos }
+#          - { os: windows-2022, platform: windows }
     runs-on: ${{ matrix.os }}
     name: tests/packaging-${{ matrix.packaging }}-${{ matrix.platform }}
     steps:

builder/tests/builder/src/test/java/io/helidon/builder/test/CustomNamedTest.java

@@ -56,7 +56,11 @@ void testIt() throws Exception {
                 .build();
         DefaultPrettyPrinter printer = new DefaultPrettyPrinter();
         String json = mapper.writer(printer).writeValueAsString(customNamed);
-        assertThat(json, equalTo("{\n" + "  \"stringSet\" : [ \"b\", \"a\", \"y\" ]\n" + "}"));
+        assertThat(json, equalTo("{"
+                + System.lineSeparator()
+                + "  \"stringSet\" : [ \"b\", \"a\", \"y\" ]"
+                + System.lineSeparator()
+                + "}"));
     }
 
 }

webclient/tests/grpc/src/test/java/io/helidon/webclient/grpc/tests/GrpcClientUriTest.java

@@ -29,6 +29,8 @@
 import io.helidon.webserver.testing.junit5.ServerTest;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledOnOs;
+import org.junit.jupiter.api.condition.OS;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -77,6 +79,7 @@ void testSupplier() {
      * Should fail to connect to first URI but succeed with second after retrying.
      */
     @Test
+    @DisabledOnOs(value = OS.WINDOWS, disabledReason = "Windows runner is too slow")
     void testSupplierWithRetries() {
         CountDownLatch latch = new CountDownLatch(2);
         ClientUri badUri = ClientUri.create(URI.create("https://foo:8000"));