Handle simplified (single quoted) JSON

Java strings are easier to write when you don't have to escape double
quotes all the time. If the JSON parsing fails due to an invalid single
quote character, try again with all the quotes replaced with double
quotes.

src/main/java/net/joshka/junit/json/params/JsonArgumentsProvider.java

@@ -9,6 +9,8 @@
 import javax.json.JsonReader;
 import javax.json.JsonStructure;
 import javax.json.JsonValue;
+import javax.json.stream.JsonParsingException;
+import java.io.IOException;
 import java.io.Reader;
 import java.io.StringReader;
 import java.util.stream.Stream;
@@ -23,6 +25,18 @@ public void accept(JsonSource jsonFileSource) {
 
     @Override
     public Stream<? extends Arguments> provideArguments(ExtensionContext extensionContext) throws Exception {
+        try {
+            return getArguments(value);
+        } catch (JsonParsingException e) {
+            // attempt to parse simplified json e.g. "{'key':value'}"
+            if (e.getMessage().contains("Unexpected char 39")) {
+                return getArguments(value.replace("'", "\""));
+            }
+            throw e;
+        }
+    }
+
+    private Stream<? extends Arguments> getArguments(String value) throws IOException {
         try (Reader reader = new StringReader(value)) {
             return values(reader).map(Arguments::of);
         }

src/test/java/net/joshka/junit/json/params/JsonArgumentsProviderTest.java

@@ -65,4 +65,11 @@ void arrayOfNumbers(JsonNumber number) {
     void arrayOfStrings(JsonString string) {
         assertThat(string.getString()).startsWith("value");
     }
+
+    @ParameterizedTest
+    @JsonSource("{'key':'value'}")
+    @DisplayName("handles simplified json")
+    void simplifiedJson(JsonObject object) {
+        assertThat(object.getString("key")).isEqualTo("value");
+    }
 }